Programs & Examples On #Modalviewcontroller

A modal view controller is a mechanism for managing a modal view, i.e. a view that assumes logical control of the user interface until the modal view is dismissed.

iOS: Modal ViewController with transparent background

in appdelegate :

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [[_window rootViewController]setModalPresentationStyle:UIModalPresentationCurrentContext];
    return YES;
}

in you first view controller from where you have to load next view:

  NextViewController *customvc = [[NextViewController alloc]init];
    [self presentViewController:customvc animated:YES completion:^{

    }];

in your nextViewController which is to be added transparent:

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor clearColor];
    UIView* backView = [[UIView alloc] initWithFrame:self.view.frame];
    backView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];
    [self.view insertSubview:backView atIndex:0];
}

Presenting modal in iOS 13 fullscreen

Latest for iOS 13 and Swift 5.x

let vc = ViewController(nibName: "ViewController", bundle: nil)

vc.modalPresentationStyle = .fullScreen

self.present(vc, animated: true, completion: nil)

presentViewController and displaying navigation bar

Swift 3

        let vc0 : ViewController1 = ViewController1()
        let vc2: NavigationController1 = NavigationController1(rootViewController: vc0)
        self.present(vc2, animated: true, completion: nil)

Swift Modal View Controller with transparent background

You can do it like this:

In your main view controller:

func showModal() {
    let modalViewController = ModalViewController()
    modalViewController.modalPresentationStyle = .overCurrentContext
    presentViewController(modalViewController, animated: true, completion: nil)
}

In your modal view controller:

class ModalViewController: UIViewController {
    override func viewDidLoad() {
        view.backgroundColor = UIColor.clearColor()
        view.opaque = false
    }
}

If you are working with a storyboard:

Just add a Storyboard Segue with Kind set to Present Modally to your modal view controller and on this view controller set the following values:

  • Background = Clear Color
  • Drawing = Uncheck the Opaque checkbox
  • Presentation = Over Current Context

As Crashalot pointed out in his comment: Make sure the segue only uses Default for both Presentation and Transition. Using Current Context for Presentation makes the modal turn black instead of remaining transparent.

Using python map and other functional tools

Here's the solution you're looking for:

>>> foos = [1.0, 2.0, 3.0, 4.0, 5.0]
>>> bars = [1, 2, 3]
>>> [(x, bars) for x in foos]
[(1.0, [1, 2, 3]), (2.0, [1, 2, 3]), (3.0, [1, 2, 3]), (4.0, [1, 2, 3]), (5.0, [
1, 2, 3])]

I'd recommend using a list comprehension (the [(x, bars) for x in foos] part) over using map as it avoids the overhead of a function call on every iteration (which can be very significant). If you're just going to use it in a for loop, you'll get better speeds by using a generator comprehension:

>>> y = ((x, bars) for x in foos)
>>> for z in y:
...     print z
...
(1.0, [1, 2, 3])
(2.0, [1, 2, 3])
(3.0, [1, 2, 3])
(4.0, [1, 2, 3])
(5.0, [1, 2, 3])

The difference is that the generator comprehension is lazily loaded.

UPDATE In response to this comment:

Of course you know, that you don't copy bars, all entries are the same bars list. So if you modify any one of them (including original bars), you modify all of them.

I suppose this is a valid point. There are two solutions to this that I can think of. The most efficient is probably something like this:

tbars = tuple(bars)
[(x, tbars) for x in foos]

Since tuples are immutable, this will prevent bars from being modified through the results of this list comprehension (or generator comprehension if you go that route). If you really need to modify each and every one of the results, you can do this:

from copy import copy
[(x, copy(bars)) for x in foos]

However, this can be a bit expensive both in terms of memory usage and in speed, so I'd recommend against it unless you really need to add to each one of them.

JPQL IN clause: Java-Arrays (or Lists, Sets...)?

I had a problem with this kind of sql, I was giving empty list in IN clause(always check the list if it is not empty). Maybe my practice will help somebody.

What is the exact meaning of Git Bash?

git bash is a shell where:

See "Fix msysGit Portable $HOME location":

On a Windows 64:

C:\Windows\SysWOW64\cmd.exe /c ""C:\Prog\Git\1.7.1\bin\sh.exe" --login -i"

This differs from git-cmd.bat, which provides git commands in a plain DOS command prompt.

A tool like GitHub for Windows (G4W) provides different shell for git (including a PowerShell one)


Update April 2015:

Note: the git bash in msysgit/Git for windows 1.9.5 is an old one:

GNU bash, version 3.1.20(4)-release (i686-pc-msys)
Copyright (C) 2005 Free Software Foundation, Inc.

But with the phasing out of msysgit (Q4 2015) and the new Git For Windows (Q2 2015), you now have Git for Windows 2.3.5.
It has a much more recent bash, based on the 64bits msys2 project, an independent rewrite of MSYS, based on modern Cygwin (POSIX compatibility layer) and MinGW-w64 with the aim of better interoperability with native Windows software. msys2 comes with its own installer too.

The git bash is now (with the new Git For Windows):

GNU bash, version 4.3.33(3)-release (x86_64-pc-msys)
Copyright (C) 2013 Free Software Foundation, Inc.

Original answer (June 2013) More precisely, from msygit wiki:

Historically, Git on Windows was only officially supported using Cygwin.
To help make a native Windows version, this project was started, based on the mingw fork.

To make the milky 'soup' of project names more clear, we say like this:

  • msysGit - is the name of this project, a build environment for Git for Windows, which releases the official binaries
  • MinGW - is a minimalist development environment for native Microsoft Windows applications.
    It is really a very thin compile-time layer over the Microsoft Runtime; MinGW programs are therefore real Windows programs, with no concept of Unix-style paths or POSIX niceties such as a fork() call
  • MSYS - is a Bourne Shell command line interpreter system, is used by MinGW (and others), was forked in the past from Cygwin
  • Cygwin - a Linux like environment, which was used in the past to build Git for Windows, nowadays has no relation to msysGit

So, your two lines description about "git bash" are:

"Git bash" is a msys shell included in "Git for Windows", and is a slimmed-down version of Cygwin (an old version at that), whose only purpose is to provide enough of a POSIX layer to run a bash.


Reminder:

msysGit is the development environment to compile Git for Windows. It is complete, in the sense that you just need to install msysGit, and then you can build Git. Without installing any 3rd-party software.

msysGit is not Git for Windows; that is an installer which installs Git -- and only Git.

See more in "Difference between msysgit and Cygwin + git?".

Can a local variable's memory be accessed outside its scope?

It can, because a is a variable allocated temporarily for the lifetime of its scope (foo function). After you return from foo the memory is free and can be overwritten.

What you're doing is described as undefined behavior. The result cannot be predicted.

Convert generator object to list for debugging

Simply call list on the generator.

lst = list(gen)
lst

Be aware that this affects the generator which will not return any further items.

You also cannot directly call list in IPython, as it conflicts with a command for listing lines of code.

Tested on this file:

def gen():
    yield 1
    yield 2
    yield 3
    yield 4
    yield 5
import ipdb
ipdb.set_trace()

g1 = gen()

text = "aha" + "bebe"

mylst = range(10, 20)

which when run:

$ python code.py 
> /home/javl/sandbox/so/debug/code.py(10)<module>()
      9 
---> 10 g1 = gen()
     11 

ipdb> n
> /home/javl/sandbox/so/debug/code.py(12)<module>()
     11 
---> 12 text = "aha" + "bebe"
     13 

ipdb> lst = list(g1)
ipdb> lst
[1, 2, 3, 4, 5]
ipdb> q
Exiting Debugger.

General method for escaping function/variable/debugger name conflicts

There are debugger commands p and pp that will print and prettyprint any expression following them.

So you could use it as follows:

$ python code.py 
> /home/javl/sandbox/so/debug/code.py(10)<module>()
      9 
---> 10 g1 = gen()
     11 

ipdb> n
> /home/javl/sandbox/so/debug/code.py(12)<module>()
     11 
---> 12 text = "aha" + "bebe"
     13 

ipdb> p list(g1)
[1, 2, 3, 4, 5]
ipdb> c

There is also an exec command, called by prefixing your expression with !, which forces debugger to take your expression as Python one.

ipdb> !list(g1)
[]

For more details see help p, help pp and help exec when in debugger.

ipdb> help exec
(!) statement
Execute the (one-line) statement in the context of
the current stack frame.
The exclamation point can be omitted unless the first word
of the statement resembles a debugger command.
To assign to a global variable you must always prefix the
command with a 'global' command, e.g.:
(Pdb) global list_options; list_options = ['-l']

How to add elements to a list in R (loop)

You should not add to your list using c inside the loop, because that can result in very very slow code. Basically when you do c(l, new_element), the whole contents of the list are copied. Instead of that, you need to access the elements of the list by index. If you know how long your list is going to be, it's best to initialise it to this size using l <- vector("list", N). If you don't you can initialise it to have length equal to some large number (e.g if you have an upper bound on the number of iterations) and then just pick the non-NULL elements after the loop has finished. Anyway, the basic point is that you should have an index to keep track of the list element and add using that eg

i <- 1
while(...) {
    l[[i]] <- new_element
    i <- i + 1
}

For more info have a look at Patrick Burns' The R Inferno (Chapter 2).

How to insert 1000 rows at a time

You can insert multiple records by inserting from a result:

insert into db (@names,@email,@password) 
select 'abc','def','mypassword' union all
select 'abc','def','mypassword' union all
select 'abc','def','mypassword' union all
select 'abc','def','mypassword' union all
select 'abc','def','mypassword' union all
select 'abc','def','mypassword'

Just add as many records you like. There may be limitations on the complexity of the query though, so it might not be possible to add as many as 1000 records at once.

Variably modified array at file scope

The reason for this warning is that const in c doesn't mean constant. It means "read only". So the value is stored at a memory address and could potentially be changed by machine code.

Sqlite primary key on multiple columns

According to the documentation, it's

CREATE TABLE something (
  column1, 
  column2, 
  column3, 
  PRIMARY KEY (column1, column2)
);

How do I show a running clock in Excel?

See the below code (taken from this post)

Put this code in a Module in VBA (Developer Tab -> Visual Basic)

Dim TimerActive As Boolean
Sub StartTimer()
    Start_Timer
End Sub
Private Sub Start_Timer()
    TimerActive = True
    Application.OnTime Now() + TimeValue("00:01:00"), "Timer"
End Sub
Private Sub Stop_Timer()
    TimerActive = False
End Sub
Private Sub Timer()
    If TimerActive Then
        ActiveSheet.Cells(1, 1).Value = Time
        Application.OnTime Now() + TimeValue("00:01:00"), "Timer"
    End If
End Sub

You can invoke the "StartTimer" function when the workbook opens and have it repeat every minute by adding the below code to your workbooks Visual Basic "This.Workbook" class in the Visual Basic editor.

Private Sub Workbook_Open()
    Module1.StartTimer
End Sub

Now, every time 1 minute passes the Timer procedure will be invoked, and set cell A1 equal to the current time.

What is the reason for having '//' in Python?

In Python 3, they made the / operator do a floating-point division, and added the // operator to do integer division (i.e., quotient without remainder); whereas in Python 2, the / operator was simply integer division, unless one of the operands was already a floating point number.

In Python 2.X:

>>> 10/3
3
>>> # To get a floating point number from integer division:
>>> 10.0/3
3.3333333333333335
>>> float(10)/3
3.3333333333333335

In Python 3:

>>> 10/3
3.3333333333333335
>>> 10//3
3

For further reference, see PEP238.

Java java.sql.SQLException: Invalid column index on preparing statement

Everywhere inside the query string, the wildcard should be ? instead of '?'. That should solve the problem.

EDIT :

To add to that, you need to change date '?' to to_date(?, 'yyyy-mm-dd'). Please try that and let me know.

How to change already compiled .class file without decompile?

Use a bytecode editor, like:

http://set.ee/jbe/

Be careful because you need a very good knowledge of the Java bytecode.

You can also change the class at runtime with bytecode weaving (like AspectJ).

How to use makefiles in Visual Studio?

To summarize with a complete solution...

There are 2 options:

  1. Use NMAKE from the Developer Command Prompt for Visual Studio

The shortcut exists in your Start Menu. Look inside the makefile to see if there are any 'setup' actions. Actions appear as the first word before a colon. Typically, all good makefiles have an "all" action so you can type: NMAKE all

  1. Create a Solution and Project Files for each binary.

Most well designed open source solutions provide a makefile with a setup action to generate Visual Studio Project Files for you so look for those first in your Makefile.

Otherwise you need to drag and drop each file or group of files and folders into each New Project you create within Visual Studio.

Hope this helps.

Storing Python dictionaries

Pickle save:

try:
    import cPickle as pickle
except ImportError:  # Python 3.x
    import pickle

with open('data.p', 'wb') as fp:
    pickle.dump(data, fp, protocol=pickle.HIGHEST_PROTOCOL)

See the pickle module documentation for additional information regarding the protocol argument.

Pickle load:

with open('data.p', 'rb') as fp:
    data = pickle.load(fp)

JSON save:

import json

with open('data.json', 'w') as fp:
    json.dump(data, fp)

Supply extra arguments, like sort_keys or indent, to get a pretty result. The argument sort_keys will sort the keys alphabetically and indent will indent your data structure with indent=N spaces.

json.dump(data, fp, sort_keys=True, indent=4)

JSON load:

with open('data.json', 'r') as fp:
    data = json.load(fp)

What is the difference between SessionState and ViewState?

Usage: If you're going to store information that you want to access on different web pages, you can use SessionState

If you want to store information that you want to access from the same page, then you can use Viewstate

Storage The Viewstate is stored within the page itself (in encrypted text), while the Sessionstate is stored in the server.

The SessionState will clear in the following conditions

  1. Cleared by programmer
  2. Cleared by user
  3. Timeout

Explain the concept of a stack frame in a nutshell

"A call stack is composed of stack frames..." — Wikipedia

A stack frame is a thing that you put on the stack. They are data structures that contain information about subroutines to call.

How to preventDefault on anchor tags?

According to the docs for ngHref you should be able to leave off the href or do href="".

<input ng-model="value" /><br />
<a id="link-1" href ng-click="value = 1">link 1</a> (link, don't reload)<br />
<a id="link-2" href="" ng-click="value = 2">link 2</a> (link, don't reload)<br />
<a id="link-4" href="" name="xx" ng-click="value = 4">anchor</a> (link, don't reload)<br />
<a id="link-5" name="xxx" ng-click="value = 5">anchor</a> (no link)<br />

Typescript import/as vs import/require?

These are mostly equivalent, but import * has some restrictions that import ... = require doesn't.

import * as creates an identifier that is a module object, emphasis on object. According to the ES6 spec, this object is never callable or newable - it only has properties. If you're trying to import a function or class, you should use

import express = require('express');

or (depending on your module loader)

import express from 'express';

Attempting to use import * as express and then invoking express() is always illegal according to the ES6 spec. In some runtime+transpilation environments this might happen to work anyway, but it might break at any point in the future without warning, which will make you sad.

Getting the last revision number in SVN?

svn info or svnversion won't take into consideration subdirectories, to find the latest 'revision' of the live codebase the hacked way below worked for me - it might take a while to run:

repo_root$ find ./ | xargs -l svn info  | grep 'Revision: ' | sort
...
Revision: 86
Revision: 86
Revision: 89
Revision: 90
$

Getting assembly name

You can use the AssemblyName class to get the assembly name, provided you have the full name for the assembly:

AssemblyName.GetAssemblyName(Assembly.GetExecutingAssembly().FullName).Name

or

AssemblyName.GetAssemblyName(e.Source).Name

MSDN Reference - AssemblyName Class

How do I get the key at a specific index from a Dictionary in Swift?

I was looking for something like a LinkedHashMap in Java. Neither Swift nor Objective-C have one if I'm not mistaken.

My initial thought was to wrap my dictionary in an Array. [[String: UIImage]] but then I realized that grabbing the key from the dictionary was wacky with Array(dict)[index].key so I went with Tuples. Now my array looks like [(String, UIImage)] so I can retrieve it by tuple.0. No more converting it to an Array. Just my 2 cents.

$(window).height() vs $(document).height

jQuery $(window).height(); or $(window).width(); is only work perfectly when your html page doctype is html

<!DOCTYPE html>
<html lang="en">
...

Method to get all files within folder and subfolders that will return a list

This is for anyone that is trying to get a list of all files in a folder and its sub-folders and save it in a text document. Below is the full code including the “using” statements, “namespace”, “class”, “methods” etc. I tried commenting as much as possible throughout the code so you could understand what each part is doing. This will create a text document that contains a list of all files in all folders and sub-folders of any given root folder. After all, what good is a list (like in Console.WriteLine) if you can’t do something with it. Here I have created a folder on the C drive called “Folder1” and created a folder inside that one called “Folder2”. Next I filled folder2 with a bunch of files, folders and files and folders within those folders. This example code will get all the files and create a list in a text document and place that text document in Folder1. Caution: you shouldn’t save the text document to Folder2 (the folder you are reading from), that would be just bad practice. Always save it to another folder.
I hope this helps someone down the line.

using System;
using System.IO;

namespace ConsoleApplication4
{
    class Program
    {
        public static void Main(string[] args)
        {
            // Create a header for your text file
            string[] HeaderA = { "****** List of Files ******" };
            System.IO.File.WriteAllLines(@"c:\Folder1\ListOfFiles.txt", HeaderA);

            // Get all files from a folder and all its sub-folders. Here we are getting all files in the folder
            // named "Folder2" that is in "Folder1" on the C: drive. Notice the use of the 'forward and back slash'.
            string[] arrayA = Directory.GetFiles(@"c:\Folder1/Folder2", "*.*", SearchOption.AllDirectories);
            {
                //Now that we have a list of files, write them to a text file.
                WriteAllLines(@"c:\Folder1\ListOfFiles.txt", arrayA);
            }

            // Now, append the header and list to the text file.
            using (System.IO.StreamWriter file =
                new System.IO.StreamWriter(@"c:\Folder1\ListOfFiles.txt"))
            {
                // First - call the header 
                foreach (string line in HeaderA)
                {
                    file.WriteLine(line);
                }

                file.WriteLine(); // This line just puts a blank space between the header and list of files. 


                // Now, call teh list of files.
                foreach (string name in arrayA)
                {
                    file.WriteLine(name);
                }

            }
          }


        // These are just the "throw new exception" calls that are needed when converting the array's to strings. 

        // This one is for the Header.
        private static void WriteAllLines(string v, string file)
        {
            //throw new NotImplementedException();
        }

        // And this one is for the list of files. 
        private static void WriteAllLines(string v, string[] arrayA)
        {
            //throw new NotImplementedException();
        }



    }
}

QED symbol in latex

Simple answer:

In the preamble make sure you have \usepackage{amssymb}

Then in the preamble we can define this simple command: \newcommand{\qed}{\hfill $\blacksquare$}

Then whenever you want the QED symbol to complete a proof, you type \qed.

If you prefer a hollow square, replace \blacksquare with \square

Playing MP4 files in Firefox using HTML5 video

I can confirm that mp4 just will not work in the video tag. No matter how much you try to mess with the type tag and the codec and the mime types from the server.

Crazy, because for the same exact video, on the same test page, the old embed tag for an mp4 works just fine in firefox. I spent all yesterday messing with this. Firefox is like IE all of a sudden, hours and hours of time, not billable. Yay.

Speaking of IE, it fails FAR MORE gracefully on this. When it can't match up the format it falls to the content between the tags, so it is possible to just put video around object around embed and everything works great. Firefox, nope, despite failing, it puts up the poster image (greyed out so that isn't even useful as a fallback) with an error message smack in the middle. So now the options are put in browser recognition code (meaning we've gained nothing on embedding videos in the last ten years) or ditch html5.

close vs shutdown socket?

"shutdown() doesn't actually close the file descriptor—it just changes its usability. To free a socket descriptor, you need to use close()."1

Seeding the random number generator in Javascript

I've implemented a number of good, short and fast Pseudorandom number generator (PRNG) functions in plain JavaScript. All of them can be seeded and provide good quality numbers.

First of all, take care to initialize your PRNGs properly. Most of the generators below have no built-in seed generating procedure (for sake of simplicity), but accept one or more 32-bit values as the initial state of the PRNG. Similar seeds (e.g. a simple seed of 1 and 2) can cause correlations in weaker PRNGs, resulting in the output having similar properties (such as randomly generated levels being similar). To avoid this, it is best practice to initialize PRNGs with a well-distributed seed.

Thankfully, hash functions are very good at generating seeds for PRNGs from short strings. A good hash function will generate very different results even when two strings are similar. Here's an example based on MurmurHash3's mixing function:

function xmur3(str) {
    for(var i = 0, h = 1779033703 ^ str.length; i < str.length; i++)
        h = Math.imul(h ^ str.charCodeAt(i), 3432918353),
        h = h << 13 | h >>> 19;
    return function() {
        h = Math.imul(h ^ h >>> 16, 2246822507);
        h = Math.imul(h ^ h >>> 13, 3266489909);
        return (h ^= h >>> 16) >>> 0;
    }
}

Each subsequent call to the return function of xmur3 produces a new "random" 32-bit hash value to be used as a seed in a PRNG. Here's how you might use it:

// Create xmur3 state:
var seed = xmur3("apples");
// Output four 32-bit hashes to provide the seed for sfc32.
var rand = sfc32(seed(), seed(), seed(), seed());

// Output one 32-bit hash to provide the seed for mulberry32.
var rand = mulberry32(seed());

// Obtain sequential random numbers like so:
rand();
rand();

Alternatively, simply choose some dummy data to pad the seed with, and advance the generator a few times (12-20 iterations) to mix the initial state thoroughly. This is often seen in reference implementations of PRNGs, but it does limit the number of initial states.

var seed = 1337 ^ 0xDEADBEEF; // 32-bit seed with optional XOR value
// Pad seed with Phi, Pi and E.
// https://en.wikipedia.org/wiki/Nothing-up-my-sleeve_number
var rand = sfc32(0x9E3779B9, 0x243F6A88, 0xB7E15162, seed);
for (var i = 0; i < 15; i++) rand();

The output of these PRNG functions produce a positive 32-bit number (0 to 232-1) which is then converted to a floating-point number between 0-1 (0 inclusive, 1 exclusive) equivalent to Math.random(), if you want random numbers of a specific range, read this article on MDN. If you only want the raw bits, simply remove the final division operation.

Another thing to note are the limitations of JS. Numbers can only represent whole integers up to 53-bit resolution. And when using bitwise operations, this is reduced to 32. This makes it difficult to implement algorithms written in C or C++, that use 64-bit numbers. Porting 64-bit code requires shims that can drastically reduce performance. So for the sake of simplicity and efficiency, I've only considered algorithms that use 32-bit math, as it is directly compatible with JS.

Now, onward to the the generators. (I maintain the full list with references here)


sfc32 (Simple Fast Counter)

sfc32 is part of the PractRand random number testing suite (which it passes of course). sfc32 has a 128-bit state and is very fast in JS.

function sfc32(a, b, c, d) {
    return function() {
      a >>>= 0; b >>>= 0; c >>>= 0; d >>>= 0; 
      var t = (a + b) | 0;
      a = b ^ b >>> 9;
      b = c + (c << 3) | 0;
      c = (c << 21 | c >>> 11);
      d = d + 1 | 0;
      t = t + d | 0;
      c = c + t | 0;
      return (t >>> 0) / 4294967296;
    }
}

Mulberry32

Mulberry32 is a simple generator with a 32-bit state, but is extremely fast and has good quality (author states it passes all tests of gjrand testing suite and has a full 232 period, but I haven't verified).

function mulberry32(a) {
    return function() {
      var t = a += 0x6D2B79F5;
      t = Math.imul(t ^ t >>> 15, t | 1);
      t ^= t + Math.imul(t ^ t >>> 7, t | 61);
      return ((t ^ t >>> 14) >>> 0) / 4294967296;
    }
}

I would recommend this if you just need a simple but decent PRNG and don't need billions of random numbers (see Birthday problem).

xoshiro128**

As of May 2018, xoshiro128** is the new member of the Xorshift family, by Vigna & Blackman (professor Vigna was also responsible for the Xorshift128+ algorithm powering most Math.random implementations under the hood). It is the fastest generator that offers a 128-bit state.

function xoshiro128ss(a, b, c, d) {
    return function() {
        var t = b << 9, r = a * 5; r = (r << 7 | r >>> 25) * 9;
        c ^= a; d ^= b;
        b ^= c; a ^= d; c ^= t;
        d = d << 11 | d >>> 21;
        return (r >>> 0) / 4294967296;
    }
}

The authors claim it passes randomness tests well (albeit with caveats). Other researchers have pointed out that fails some tests in TestU01 (particularly LinearComp and BinaryRank). In practice, it should not cause issues when floats are used (such as these implementations), but may cause issues if relying on the raw low bits.

JSF (Jenkins' Small Fast)

This is JSF or 'smallprng' by Bob Jenkins (2007), the guy who made ISAAC and SpookyHash. It passes PractRand tests and should be quite fast, although not as fast as SFC.

function jsf32(a, b, c, d) {
    return function() {
        a |= 0; b |= 0; c |= 0; d |= 0;
        var t = a - (b << 27 | b >>> 5) | 0;
        a = b ^ (c << 17 | c >>> 15);
        b = c + d | 0;
        c = d + t | 0;
        d = a + t | 0;
        return (d >>> 0) / 4294967296;
    }
}

LCG (aka Lehmer/Park-Miller RNG or MCG)

LCG is extremely fast and simple, but the quality of its randomness is so low, that improper use can actually cause bugs in your program! Nonetheless, it is significantly better than some answers suggesting to use Math.sin or Math.PI! It's a one-liner though, which is nice :).

var LCG=s=>()=>(2**31-1&(s=Math.imul(48271,s)))/2**31;

This implementation is called the minimal standard RNG as proposed by Park–Miller in 1988 & 1993 and implemented in C++11 as minstd_rand. Keep in mind that the state is 31-bit (31 bits give 2 billion possible states, 32 bits give double that). This is the very type of PRNG that others are trying to replace!

It will work, but I wouldn't use it unless you really need speed and don't care about randomness quality (what is random anyway?). Great for a game jam or a demo or something. LCGs suffer from seed correlations, so it is best to discard the first result of an LCG. And if you insist on using an LCG, adding an increment value may improve results, but it is probably an exercise in futility when much better options exist.

There seems to be other multipliers offering a 32-bit state (increased state-space):

var LCG=s=>()=>(s=Math.imul(741103597,s)>>>0)/2**32;
var LCG=s=>()=>(s=Math.imul(1597334677,s)>>>0)/2**32;

These LCG values are from: P. L'Ecuyer: A table of Linear Congruential Generators of different sizes and good lattice structure, April 30 1997.

StringLength vs MaxLength attributes ASP.NET MVC with Entity Framework EF Code First

MaxLength is used for the Entity Framework to decide how large to make a string value field when it creates the database.

From MSDN:

Specifies the maximum length of array or string data allowed in a property.

StringLength is a data annotation that will be used for validation of user input.

From MSDN:

Specifies the minimum and maximum length of characters that are allowed in a data field.

Relative paths based on file location instead of current working directory

Just one line will be OK.

cat "`dirname $0`"/../some.txt

make script execution to unlimited

Your script could be stopping, not because of the PHP timeout but because of the timeout in the browser you're using to access the script (ie. Firefox, Chrome, etc). Unfortunately there's seldom an easy way to extend this timeout, and in most browsers you simply can't. An option you have here is to access the script over a terminal. For example, on Windows you would make sure the PHP executable is in your path variable and then I think you execute:

C:\path\to\script> php script.php

Or, if you're using the PHP CGI, I think it's:

C:\path\to\script> php-cgi script.php

Plus, you would also set ini_set('max_execution_time', 0); in your script as others have mentioned. When running a PHP script this way, I'm pretty sure you can use buffer flushing to echo out the script's progress to the terminal periodically if you wish. The biggest issue I think with this method is there's really no way of stopping the script once it's started, other than stopping the entire PHP process or service.

Mocking python function based on input arguments

You can also use partial from functools if you want to use a function that takes parameters but the function you are mocking does not. E.g. like this:

def mock_year(year):
    return datetime.datetime(year, 11, 28, tzinfo=timezone.utc)
@patch('django.utils.timezone.now', side_effect=partial(mock_year, year=2020))

This will return a callable that doesn't accept parameters (like Django's timezone.now()), but my mock_year function does.

Adding a slide effect to bootstrap dropdown

I'm doing something like that but on hover instead of on click.. This is the code I'm using, you might be able to tweak it up a bit to get it to work on click

$('.navbar .dropdown').hover(function() {
  $(this).find('.dropdown-menu').first().stop(true, true).delay(250).slideDown();
}, function() {
  $(this).find('.dropdown-menu').first().stop(true, true).delay(100).slideUp()
});

Changing the size of a column referenced by a schema-bound view in SQL Server

See this link

Resize or Modify a MS SQL Server Table Column with Default Constraint using T-SQL Commands

the solution for such a SQL Server problem is going to be

Dropping or disabling the DEFAULT Constraint on the table column.

Modifying the table column data type and/or data size.

Re-creating or enabling the default constraint back on the sql table column.

Bye

Bootstrap 4, how to make a col have a height of 100%?

I came across this problem because my cols exceeded the row grid length (> 12)

A solution using 100% Bootstrap 4:

Since the rows in Bootstrap are already display: flex

You just need to add flex-fill to the Col, and h-100 to the container and any children.

Pen here: https://codepen.io/joshkopecek/pen/Exjdgjo

<div class="container-fluid h-100">
  <div class="row justify-content-center h-100">

    <div class="col-4 hidden-md-down flex-fill" id="yellow">
      XXXX
    </div>

    <div id="blue" class="col-10 col-sm-10 col-md-10 col-lg-8 col-xl-8 h-100">
      Form Goes Here
    </div>

    <div id="green" class="col-10 col-sm-10 col-md-10 col-lg-8 col-xl-8 h-100">
      Another form
    </div>
  </div>
</div>

Linq order by, group by and order by each group?

try this...

public class Student 
    {
        public int Grade { get; set; }
        public string Name { get; set; }
        public override string ToString()
        {
            return string.Format("Name{0} : Grade{1}", Name, Grade);
        }
    }

class Program
{
    static void Main(string[] args)
    {

      List<Student> listStudents = new List<Student>();
      listStudents.Add(new Student() { Grade = 10, Name = "Pedro" });
      listStudents.Add(new Student() { Grade = 10, Name = "Luana" });
      listStudents.Add(new Student() { Grade = 10, Name = "Maria" });
      listStudents.Add(new Student() { Grade = 11, Name = "Mario" });
      listStudents.Add(new Student() { Grade = 15, Name = "Mario" });
      listStudents.Add(new Student() { Grade = 10, Name = "Bruno" });
      listStudents.Add(new Student() { Grade = 10, Name = "Luana" });
      listStudents.Add(new Student() { Grade = 11, Name = "Luana" });
      listStudents.Add(new Student() { Grade = 22, Name = "Maria" });
      listStudents.Add(new Student() { Grade = 55, Name = "Bruno" });
      listStudents.Add(new Student() { Grade = 77, Name = "Maria" });
      listStudents.Add(new Student() { Grade = 66, Name = "Maria" });
      listStudents.Add(new Student() { Grade = 88, Name = "Bruno" });
      listStudents.Add(new Student() { Grade = 42, Name = "Pedro" });
      listStudents.Add(new Student() { Grade = 33, Name = "Bruno" });
      listStudents.Add(new Student() { Grade = 33, Name = "Luciana" });
      listStudents.Add(new Student() { Grade = 17, Name = "Maria" });
      listStudents.Add(new Student() { Grade = 25, Name = "Luana" });
      listStudents.Add(new Student() { Grade = 25, Name = "Pedro" });

      listStudents.GroupBy(g => g.Name).OrderBy(g => g.Key).SelectMany(g => g.OrderByDescending(x => x.Grade)).ToList().ForEach(x => Console.WriteLine(x.ToString()));
    }
}

How to 'foreach' a column in a DataTable using C#?

int countRow = dt.Rows.Count;
int countCol = dt.Columns.Count;

for (int iCol = 0; iCol < countCol; iCol++)
{
     DataColumn col = dt.Columns[iCol];

     for (int iRow = 0; iRow < countRow; iRow++)
     {
         object cell = dt.Rows[iRow].ItemArray[iCol];

     }
}

Owl Carousel, making custom navigation

If you want to use your own custom navigation elements,

For Owl Carousel 1

var owl = $('.owl-carousel');
owl.owlCarousel();
// Go to the next item
$('.customNextBtn').click(function() {
    owl.trigger('owl.prev');
})
// Go to the previous item
$('.customPrevBtn').click(function() {
    owl.trigger('owl.next');
})

For Owl Carousel 2

var owl = $('.owl-carousel');
owl.owlCarousel();
// Go to the next item
$('.customNextBtn').click(function() {
    owl.trigger('next.owl.carousel');
})
// Go to the previous item
$('.customPrevBtn').click(function() {
    // With optional speed parameter
    // Parameters has to be in square bracket '[]'
    owl.trigger('prev.owl.carousel', [300]);
})

How to validate an email address in PHP

This will not only validate your email, but also sanitize it for unexpected characters:

$email  = $_POST['email'];
$emailB = filter_var($email, FILTER_SANITIZE_EMAIL);

if (filter_var($emailB, FILTER_VALIDATE_EMAIL) === false ||
    $emailB != $email
) {
    echo "This email adress isn't valid!";
    exit(0);
}

Convert a list of characters into a string

This works in many popular languages like JavaScript and Ruby, why not in Python?

>>> ['a', 'b', 'c'].join('')
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
AttributeError: 'list' object has no attribute 'join'

Strange enough, in Python the join method is on the str class:

# this is the Python way
"".join(['a','b','c','d'])

Why join is not a method in the list object like in JavaScript or other popular script languages? It is one example of how the Python community thinks. Since join is returning a string, it should be placed in the string class, not on the list class, so the str.join(list) method means: join the list into a new string using str as a separator (in this case str is an empty string).

Somehow I got to love this way of thinking after a while. I can complain about a lot of things in Python design, but not about its coherence.

Read file As String

this is working for me

i use this path

String FILENAME_PATH =  "/mnt/sdcard/Download/Version";

public static String getStringFromFile (String filePath) throws Exception {
    File fl = new File(filePath);
    FileInputStream fin = new FileInputStream(fl);
    String ret = convertStreamToString(fin);
    //Make sure you close all streams.
    fin.close();        
    return ret;

}

Multiplying Two Columns in SQL Server

Syntax:

SELECT <Expression>[Arithmetic_Operator]<expression>...
 FROM [Table_Name] 
 WHERE [expression];
  1. Expression : Expression made up of a single constant, variable, scalar function, or column name and can also be the pieces of a SQL query that compare values against other values or perform arithmetic calculations.
  2. Arithmetic_Operator : Plus(+), minus(-), multiply(*), and divide(/).
  3. Table_Name : Name of the table.

SVG fill color transparency / alpha?

Use attribute fill-opacity in your element of SVG.

Default value is 1, minimum is 0, in step use decimal values EX: 0.5 = 50% of alpha. Note: It is necessary to define fill color to apply fill-opacity.

See my example.

References.

getting integer values from textfield

You need to use Integer.parseInt(String)

private void jTextField2MouseClicked(java.awt.event.MouseEvent evt) {
        if(evt.getSource()==jTextField2){
            int jml = Integer.parseInt(jTextField3.getText());
            jTextField1.setText(numberToWord(jml));

        }
    }

Row count with PDO

When it is matter of mysql how to count or get how many rows in a table with PHP PDO I use this

// count total number of rows
$query = "SELECT COUNT(*) as total_rows FROM sometable";
$stmt = $con->prepare($query);

// execute query
$stmt->execute();

// get total rows
$row = $stmt->fetch(PDO::FETCH_ASSOC);
$total_rows = $row['total_rows'];

credits goes to Mike @ codeofaninja.com

How to declare std::unique_ptr and what is the use of it?

The constructor of unique_ptr<T> accepts a raw pointer to an object of type T (so, it accepts a T*).

In the first example:

unique_ptr<int> uptr (new int(3));

The pointer is the result of a new expression, while in the second example:

unique_ptr<double> uptr2 (pd);

The pointer is stored in the pd variable.

Conceptually, nothing changes (you are constructing a unique_ptr from a raw pointer), but the second approach is potentially more dangerous, since it would allow you, for instance, to do:

unique_ptr<double> uptr2 (pd);
// ...
unique_ptr<double> uptr3 (pd);

Thus having two unique pointers that effectively encapsulate the same object (thus violating the semantics of a unique pointer).

This is why the first form for creating a unique pointer is better, when possible. Notice, that in C++14 we will be able to do:

unique_ptr<int> p = make_unique<int>(42);

Which is both clearer and safer. Now concerning this doubt of yours:

What is also not clear to me, is how pointers, declared in this way will be different from the pointers declared in a "normal" way.

Smart pointers are supposed to model object ownership, and automatically take care of destroying the pointed object when the last (smart, owning) pointer to that object falls out of scope.

This way you do not have to remember doing delete on objects allocated dynamically - the destructor of the smart pointer will do that for you - nor to worry about whether you won't dereference a (dangling) pointer to an object that has been destroyed already:

{
    unique_ptr<int> p = make_unique<int>(42);
    // Going out of scope...
}
// I did not leak my integer here! The destructor of unique_ptr called delete

Now unique_ptr is a smart pointer that models unique ownership, meaning that at any time in your program there shall be only one (owning) pointer to the pointed object - that's why unique_ptr is non-copyable.

As long as you use smart pointers in a way that does not break the implicit contract they require you to comply with, you will have the guarantee that no memory will be leaked, and the proper ownership policy for your object will be enforced. Raw pointers do not give you this guarantee.

A fatal error has been detected by the Java Runtime Environment: SIGSEGV, libjvm

Here is assembly code:

7f0b024734be:       48 8d 14 f5 00 00 00    lea    rdx,[rsi*8]
7f0b024734c5:       00
7f0b024734c6:       48 03 13                add    rdx,QWORD PTR [rbx]
7f0b024734c9:       48 8d 7a 10             lea    rdi,[rdx+16]
7f0b024734cd:       8b 5f 08                mov    ebx,DWORD PTR [rdi+8]
7f0b024734d0:       89 d8                   mov    eax,ebx
7f0b024734d2:       c1 f8 03                sar    eax,0x3
7f0b024734d5:       85 db                   test   ebx,ebx
7f0b024734d7:       0f 8e cb 05 00 00       jle    0x7f0b02473aa8

And what it does is:

rdx = 0x00007f0a808d4ed2 * 8; // equals 0x0003F854046A7690. WTF???
rdx = rdx + something from old gen heap; // results 0x000600007f090486
rdi = rdx + 16; // results 0x000600007f090496
ebx = something from edi address (0x000600007f090496) + 8

Well I've had a look at the address map and there is nothing mapped to 0x000600007f090496 which is why you are getting a SEGV. Are you getting the same error with 1.6.0_26 JVM? Can you try it on a 32bit JVM? Looks like a JVM issue to me. Why would it do the first rdx=0x0... * 8 thing?

Why would Oracle.ManagedDataAccess not work when Oracle.DataAccess does?

In my case everything said above was OK, but I still have been receiving ORA-12545: Network Transport: Unable to resolve connect hostname

I tried to ping the Oracle machine and found out I cannot see it and added it to the hosts file. Then I received another error message ORA-12541: TNS:no listener. After investigation I realized that pinging the same hostname from different machines getting different IP addresses(I don't know why) and I changed the IP address in my host file, which resolved the problem on 100%.

I'm bothering to write my experience as it seems obvious, but although I was sure the problem is in the above settings I totally forgot to check if I really can see the remote DB machine out there. Keep it in mind when you are out of ideas what is going on.....

These links helped me a lot:

http://www.moreajays.com/2013/03/ora-12545-connect-failed-because-target.html http://www.orafaq.com/wiki/ORA-12541

Chrome & Safari Error::Not allowed to load local resource: file:///D:/CSS/Style.css

The solution is already answered here above (long ago).

But the implicit question "why does it work in FF and IE but not in Chrome and Safari" is found in the error text "Not allowed to load local resource": Chrome and Safari seem to use a more strict implementation of sandboxing (for security reasons) than the other two (at this time 2011).

This applies for local access. In a (normal) server environment (apache ...) the file would simply not have been found.

Multiple line code example in Javadoc comment

I had a really tough time with including a specific code example in a javadoc comment. I'd like to share this one.
Please note the following:

  • usage of old <code> - tag to prevent the curly brackets from being interpreted
  • usage of "new" {@code ...} - tag to get the generics included in the output
  • escaping of the @ sign in @Override via "{@literal @}Override" because javadoc generator "tilts" there due to the fact that the @ goes directly after an opening curly bracket
  • remove one space in front of {@code and {@literal, to compensate inner spaces and keep the alignment

javadoc code:

/** this methods adds a specific translator from one type to another type. `
  * i.e.
  * <pre>
  * <code>new BeanTranslator.Builder()
  *   .translate(
  *     new{@code Translator<String, Integer>}(String.class, Integer.class){
  *      {@literal @}Override
  *       public Integer translate(String instance) {
  *         return Integer.valueOf(instance);
  *       }})
  *   .build();
  * </code>
  * </pre>
  * @param translator
  */

gets printed as

new BeanTranslator.Builder()
  .translate(
    new Translator<String, Integer>(String.class, Integer.class){
      @Override
      public Integer translate(String instance) {
        return Integer.valueOf(instance);
      }})
  .build();

Vim: insert the same characters across multiple lines

  1. Move the cursor to the n in name.
  2. Enter visual block mode (Ctrlv).
  3. Press j three times (or 3j).
  4. Press I (capital i).
  5. Type in vendor_. Note: It will only update the screen in the first line - until Esc is pressed (6.), at which point all lines will be updated.
  6. Press Esc.

mini-screencast demonstrating the method

An uppercase I must be used rather than a lowercase i, because the lowercase i is interpreted as the start of a text object, which is rather useful on its own, e.g. for selecting inside a tag block (it):

mini-screencast showing the usefulness of the 'it' text object

WordPress is giving me 404 page not found for all pages except the homepage

If the default behavior (example.com/?p=42) is working, you should:

  • Change to your preferred permalink style: Admin: Settings > Permalinks, and click Save. Sometime it fixes the issue. If it didn't:
  • Verify that the file /path/to/wordpress/.htaccess has been changed and now includes the line RewriteEngine On. If it doesn't include the line, it's a Wordpress permissions issue.
  • Verify that the 'rewrite' module is loaded: create a PHP file with

    <?php
      phpinfo()
    ?>
    

    in it, open it in the browser and search for mod_rewrite. It should be in the 'Loaded Modules' section. If it's not, enable it - Look at your apache default index.html file for details - in Ubuntu, you do it with the helper a2enmod.

  • Verify that apache server is looking at the .htaccess file. open httpd.conf - or it's Ubuntu's alternative, /etc/apache2/apache2.conf. In it, You should have something like

    <Directory /path/to/wordpress>
      Options Indexes FollowSymLinks
      AllowOverride All
      Require all granted
    </Directory>
    
  • After making these changes, don't forget to restart your apache server. sudo service apache2 restart

In Git, what is the difference between origin/master vs origin master?

origin/master is an entity (since it is not a physical branch) representing the state of the master branch on the remote origin.

origin master is the branch master on the remote origin.

So we have these:

  • origin/master ( A representation or a pointer to the remote branch)
  • master - (actual branch)
  • <Your_local_branch> (actual branch)
  • <Your_local_branch4> (actual branch)
  • <Your_local_branch4> (actual branch)

Example (in local branch master):

git fetch # get current state of remote repository
git merge origin/master # merge state of remote master branch into local branch
git push origin master # push local branch master to remote branch master

Difference between nVidia Quadro and Geforce cards?

It's called market segmentation or something like that. nVidia produces one very configurable chip and then sells it in different configurations that essentially have the same elements and hence the same bill of materials to different market segments, although one would usually expect to find elements of higher quality on the more expensive Quadro boards.

What differentiates Quadro from GeForce is that GeForce usually has its dual precision floating point performance severely limited, e.g. to 1/4 or 1/8 of that of the Quadro/Tesla GPUs. This limitation is purely artificial and imposed on solely to differentiate the gamer/enthusiast segment from the professional segment. Lower DP performance makes GeForce boards bad candidates for stuff like scientific or engineering computing and those are markets where money streams from. Also Quadros (arguably) have more display channels and faster RAMDACs which allows them to drive more and higher resolution screens, a sort of setup perceived as professional for CAD/CAM work.

As Jason Morgan has pointed out, there are tricks that can unlock some of the disabled features in GeForce to bring them in par with Quadro. Those usually involves soldering and voids the warranty on the card. Since HPC puts lots of stress on the hardware and malfunctions occur more frequently that one would like them to, I would advise against using cheap tricks.

When to use reinterpret_cast?

You could use reinterprete_cast to check inheritance at compile time.
Look here: Using reinterpret_cast to check inheritance at compile time

Why use the 'ref' keyword when passing an object?

Since TestRef is a class (which are reference objects), you can change the contents inside t without passing it as a ref. However, if you pass t as a ref, TestRef can change what the original t refers to. i.e. make it point to a different object.

Swapping pointers in C (char, int)

This example does not swap two int pointers. It swaps the value of the integers that pa and pb are pointing to. Here's an example of what's going on when you call this:

void Swap1 (int *pa, int *pb){
    int temp = *pa;
    *pa = *pb;
    *pb = temp;
}
int main()
{
    int a = 42;
    int b = 17;


    int *pa = &a;
    int *pb = &b;

    printf("--------Swap1---------\n");
    printf("a = %d\n b = %d\n", a, b);
    swap1(pa, pb);
    printf("a = %d\n = %d\n", a, a);
    printf("pb address =  %p\n", pa);
    printf("pa address =  %p\n", pb);
}

The output here is:

a = 42
b = 17
pa address =  0x7fffdf933228
pb address =  0x7fffdf93322c
--------Swap---------
pa = 17
pb = 42
a = 17
b = 42
pa address =  0x7fffdf933228
pb address =  0x7fffdf93322c

Note that the values swapped, but the pointer's addresses did not swap!

In order to swap addresses we need to do this:

void swap2 (int **pa, int **pb){
    int temp = *pa;
    *pa = *pb;
    *pb = temp;
}

and in main call the function like swap2(&pa, &pb);

Now the addresses are swapped, as well as the values for the pointers. a and b have the same values that the are initialized with The integers a and b did not swap because it swap2 swaps the addresses being being pointed to by the pointers!:

a = 42
b = 17
pa address =  0x7fffddaa9c98
pb address =  0x7fffddaa9c9c
--------Swap---------
pa = 17
pb = 42
a = 42
b = 17
pa address =  0x7fffddaa9c9c
pb address =  0x7fffddaa9c98

Since Strings in C are char pointers, and you want to swap Strings, you are really swapping a char pointer. As in the examples with an int, you need a double pointer to swap addresses.

The values of integers can be swapped even if the address isn't, but Strings are by definition a character pointer. You could swap one char with single pointers as the parameter, but a character pointer needs to be a double pointer in order to swap the strings.

C# Convert a Base64 -> byte[]

Try

byte[] incomingByteArray = receive...; // This is your Base64-encoded bute[]

byte[] decodedByteArray =Convert.FromBase64String (Encoding.ASCII.GetString (incomingByteArray)); 
// This work because all Base64-encoding is done with pure ASCII characters

Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?

nil? can be omitted in boolean contexts. Generally, you can use this to replicate the C# code:

return my_string.nil? || my_string.empty?

websocket closing connection automatically

Just found the solution to this for myself. What you want to set is the maxIdleTime of WebSocketServlet, in millis. How to do that depends on how you config your servlet. With Guice ServletModule you can do something like this for timeout of 10 hours:

serve("ws").with(MyWSServlet.class, 
new HashMap<String, Sring>(){{ put("maxIdleTime", TimeUnit.HOURS.toMillis(10) + ""); }});

Anything <0 is infinite idle time I believe.

How to turn off the Eclipse code formatter for certain sections of Java code?

Alternative method: In Eclipse 3.6, under "Line Wrapping" then "General Settings" there is an option to "Never join already wrapped lines." This means the formatter will wrap long lines but not undo any wrapping you already have.

'names' attribute must be the same length as the vector

I have seen such error and i solved it. You may have missing values in your data set. Number of observations in every column must also be the same.

Check if year is leap year in javascript

If you're doing this in an Node.js app, you can use the leap-year package:

npm install --save leap-year

Then from your app, use the following code to verify whether the provided year or date object is a leap year:

var leapYear = require('leap-year');

leapYear(2014);
//=> false 

leapYear(2016);
//=> true 

Using a library like this has the advantage that you don't have to deal with the dirty details of getting all of the special cases right, since the library takes care of that.

Laravel password validation rule

This doesn't quite match the OP requirements, though hopefully it helps. With Laravel you can define your rules in an easy-to-maintain format like so:

    $inputs = [
        'email'    => 'foo',
        'password' => 'bar',
    ];

    $rules = [
        'email'    => 'required|email',
        'password' => [
            'required',
            'string',
            'min:10',             // must be at least 10 characters in length
            'regex:/[a-z]/',      // must contain at least one lowercase letter
            'regex:/[A-Z]/',      // must contain at least one uppercase letter
            'regex:/[0-9]/',      // must contain at least one digit
            'regex:/[@$!%*#?&]/', // must contain a special character
        ],
    ];

    $validation = \Validator::make( $inputs, $rules );

    if ( $validation->fails() ) {
        print_r( $validation->errors()->all() );
    }

Would output:

    [
        'The email must be a valid email address.',
        'The password must be at least 10 characters.',
        'The password format is invalid.',
    ]

(The regex rules share an error message by default—i.e. four failing regex rules result in one error message)

Redirect all to index.php using htaccess

There is one "trick" for this problem that fits all scenarios, a so obvious solution that you will have to try it to believe it actually works... :)

Here it is...

<IfModule mod_rewrite.c>

   RewriteEngine On

   RewriteCond %{REQUEST_FILENAME}  -f [OR]
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteRule ^(.*)$ index.php [L,QSA]

</IfModule>

Basically, you are asking MOD_REWRITE to forward to index.php the URI request always when a file exists AND always when the requested file doesn't exist!

When investigating the source code of MOD-REWRITE to understand how it works I realized that all its checks always happen after the verification if the referenced file exists or not. Only then the RegEx are processed. Even when your URI points to a folder, Apache will enforce the check for the index files listed in its configuration file.

Based on that simple discovery, turned obvious a simple file validation would be enough for all possible calls, as far as we double-tap the file presence check and route both results to the same end-point, covering 100% of the possibilities.

IMPORTANT: Notice there is no "/" in index.php. By default, MOD_REWRITE will use the folder it is set as "base folder" for the forwarding. The beauty of it is that it doesn't necessarily need to be the "root folder" of the site, allowing this solution work for localhost/ and/or any subfolder you apply it.

Ultimately, some other solutions I tested before (the ones that appeared to be working fine) broke the PHP ability to "require" a file via its relative path, which is a bummer. Be careful.

Some people may say this is an inelegant solution. It may be, actually, but as far as tests, in several scenarios, several servers, several different Apache versions, etc., this solution worked 100% on all cases!

How to get first record in each group using Linq

    var res = from element in list
              group element by element.F1
                  into groups
                  select groups.OrderBy(p => p.F2).First();

javascript remove "disabled" attribute from html input

To set the disabled to false using the name property of the input:

document.myForm.myInputName.disabled = false;

Java - Best way to print 2D array?

Two-liner with new line:

for(int[] x: matrix)
            System.out.println(Arrays.toString(x));

One liner without new line:

System.out.println(Arrays.deepToString(matrix));

Get counts of all tables in a schema

This should do it:

declare
    v_count integer;
begin

    for r in (select table_name, owner from all_tables
              where owner = 'SCHEMA_NAME') 
    loop
        execute immediate 'select count(*) from ' || r.table_name 
            into v_count;
        INSERT INTO STATS_TABLE(TABLE_NAME,SCHEMA_NAME,RECORD_COUNT,CREATED)
        VALUES (r.table_name,r.owner,v_count,SYSDATE);
    end loop;

end;

I removed various bugs from your code.

Note: For the benefit of other readers, Oracle does not provide a table called STATS_TABLE, you would need to create it.

How to customize the background/border colors of a grouped table view cell?

This task can be easily done using PrettyKit by adding about 5 lines of code. If you use nib files or storyboard, also do not forget to apply this little hack . When you use this approach, you should subclass your cell from PrettyTableViewCell:

#import <PrettyKit/PrettyKit.h>

@class RRSearchHistoryItem;

@interface RRSearchHistoryCell : PrettyTableViewCell

This is example of my cellForRowAtIndexPath:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *cellIdentifier = @"RRSearchHistoryCell";

  RRSearchHistoryCell *cell = (RRSearchHistoryCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

  if ( cell == nil ) {

    NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"RRSearchHistoryCell" owner:self options:nil];
    cell = topLevelObjects[0];
    cell.gradientStartColor = RGB(0xffffff);
    cell.gradientEndColor = RGB(0xf3f3f3);

  }

  RRSearchHistoryItem *item = _historyTableData[indexPath.row];
  [cell setHistoryItem:item];


  [cell prepareForTableView:tableView indexPath:indexPath];

  return cell;
}

Factorial using Recursion in Java

Although this is old, it still keeps coming up pretty well in google. So I figured I'd mention this. No one mentioned to check for when x = 0.

0! and 1! both = 1.

This isn't being checked with the previous answers, and would cause a stack overflow, if fact(0) was run. Anyway simple fix:

public static int fact(int x){
    if (x==1 | x==0)
        return 1;
    return fact(x-1) * x;
}// fact

Add a custom attribute to a Laravel / Eloquent model on load?

Step 1: Define attributes in $appends
Step 2: Define accessor for that attributes.
Example:

<?php
...

class Movie extends Model{

    protected $appends = ['cover'];

    //define accessor
    public function getCoverAttribute()
    {
        return json_decode($this->InJson)->cover;
    }

Android XXHDPI resources

The newer android phones in the market like HTC one, Xperia Z etc have resolutions in the >480dpi range, putting them in the new xxhdpi class as well. The new assets might be useful for them too.

Is it possible to decrypt SHA1

SHA1 is a cryptographic hash function, so the intention of the design was to avoid what you are trying to do.

However, breaking a SHA1 hash is technically possible. You can do so by just trying to guess what was hashed. This brute-force approach is of course not efficient, but that's pretty much the only way.

So to answer your question: yes, it is possible, but you need significant computing power. Some researchers estimate that it costs $70k - $120k.

As far as we can tell today, there is also no other way but to guess the hashed input. This is because operations such as mod eliminate information from your input. Suppose you calculate mod 5 and you get 0. What was the input? Was it 0, 5 or 500? You see, you can't really 'go back' in this case.

Disable eslint rules for folder

YAML version :

overrides:
  - files: *-tests.js
    rules:
      no-param-reassign: 0

Example of specific rules for mocha tests :

You can also set a specific env for a folder, like this :

overrides:
  - files: test/*-tests.js
    env:
      mocha: true

This configuration will fix error message about describe and it not defined, only for your test folder:

/myproject/test/init-tests.js
6:1 error 'describe' is not defined no-undef
9:3 error 'it' is not defined no-undef

Refused to execute script, strict MIME type checking is enabled?

I had my web server returning:

Content-Type: application\javascript

and couldn't for the life of me figure out what was wrong. Then I realized I had the slash in the wrong direction. It should be:

Content-Type: application/javascript

Linq UNION query to select two elements

EDIT:

Ok I found why the int.ToString() in LINQtoEF fails, please read this post: Problem with converting int to string in Linq to entities

This works on my side :

        List<string> materialTypes = (from u in result.Users
                                      select u.LastName)
                       .Union(from u in result.Users
                               select SqlFunctions.StringConvert((double) u.UserId)).ToList();

On yours it should be like this:

    IList<String> materialTypes = ((from tom in context.MaterialTypes
                                       where tom.IsActive == true
                                       select tom.Name)
                                       .Union(from tom in context.MaterialTypes
                                       where tom.IsActive == true
                                       select SqlFunctions.StringConvert((double)tom.ID))).ToList();

Thanks, i've learnt something today :)

Multiple glibc libraries on a single host

@msb gives a safe solution.

I met this problem when I did import tensorflow as tf in conda environment in CentOS 6.5 which only has glibc-2.12.

ImportError: /lib64/libc.so.6: version `GLIBC_2.16' not found (required by /home/

I want to supply some details:

First install glibc to your home directory:

mkdir ~/glibc-install; cd ~/glibc-install
wget http://ftp.gnu.org/gnu/glibc/glibc-2.17.tar.gz
tar -zxvf glibc-2.17.tar.gz
cd glibc-2.17
mkdir build
cd build
../configure --prefix=/home/myself/opt/glibc-2.17  # <-- where you install new glibc
make -j<number of CPU Cores>  # You can find your <number of CPU Cores> by using **nproc** command
make install

Second, follow the same way to install patchelf;

Third, patch your Python:

[myself@nfkd ~]$ patchelf --set-interpreter /home/myself/opt/glibc-2.17/lib/ld-linux-x86-64.so.2 --set-rpath /home/myself/opt/glibc-2.17/lib/ /home/myself/miniconda3/envs/tensorflow/bin/python

as mentioned by @msb

Now I can use tensorflow-2.0 alpha in CentOS 6.5.

ref: https://serverkurma.com/linux/how-to-update-glibc-newer-version-on-centos-6-x/

Error: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'

Add "EntityFramework.SqlServer.dll" into your bin folder. Problem will get resolved.

Parsing JSON from XmlHttpRequest.responseJSON

I think you have to include jQuery to use responseJSON.

Without jQuery, you could try with responseText and try like eval("("+req.responseText+")");

UPDATE:Please read the comment regarding eval, you can test with eval, but don't use it in working extension.

OR

use json_parse : it does not use eval

TypeError: method() takes 1 positional argument but 2 were given

You should actually create a class:

class accum:
    def __init__(self):
        self.acc = 0
    def accumulator(self, var2add, end):
        if not end:
            self.acc+=var2add
    return self.acc

Converting a string to int in Groovy

Use the toInteger() method to convert a String to an Integer, e.g.

int value = "99".toInteger()

An alternative, which avoids using a deprecated method (see below) is

int value = "66" as Integer

If you need to check whether the String can be converted before performing the conversion, use

String number = "66"

if (number.isInteger()) {
  int value = number as Integer
}

Deprecation Update

In recent versions of Groovy one of the toInteger() methods has been deprecated. The following is taken from org.codehaus.groovy.runtime.StringGroovyMethods in Groovy 2.4.4

/**
 * Parse a CharSequence into an Integer
 *
 * @param self a CharSequence
 * @return an Integer
 * @since 1.8.2
 */
public static Integer toInteger(CharSequence self) {
    return Integer.valueOf(self.toString().trim());
}

/**
 * @deprecated Use the CharSequence version
 * @see #toInteger(CharSequence)
 */
@Deprecated
public static Integer toInteger(String self) {
    return toInteger((CharSequence) self);
}

You can force the non-deprecated version of the method to be called using something awful like:

int num = ((CharSequence) "66").toInteger()

Personally, I much prefer:

int num = 66 as Integer

Using regular expression in css?

First of all, there are many, many ways of matching items within a HTML document. Start with this reference to see some of the available selectors/patterns which you can use to apply a style rule to an element(s).

http://www.w3.org/TR/selectors/

Match all divs which are direct descendants of #main.

#main > div

Match all divs which are direct or indirect descendants of #main.

#main div

Match the first div which is a direct descendant of #sections.

#main > div:first-child

Match a div with a specific attribute.

#main > div[foo="bar"]

Adding a view controller as a subview in another view controller

A couple of observations:

  1. When you instantiate the second view controller, you are calling ViewControllerB(). If that view controller programmatically creates its view (which is unusual) that would be fine. But the presence of the IBOutlet suggests that this second view controller's scene was defined in Interface Builder, but by calling ViewControllerB(), you are not giving the storyboard a chance to instantiate that scene and hook up all the outlets. Thus the implicitly unwrapped UILabel is nil, resulting in your error message.

    Instead, you want to give your destination view controller a "storyboard id" in Interface Builder and then you can use instantiateViewController(withIdentifier:) to instantiate it (and hook up all of the IB outlets). In Swift 3:

    let controller = storyboard!.instantiateViewController(withIdentifier: "scene storyboard id")
    

    You can now access this controller's view.

  2. But if you really want to do addSubview (i.e. you're not transitioning to the next scene), then you are engaging in a practice called "view controller containment". You do not just want to simply addSubview. You want to do some additional container view controller calls, e.g.:

    let controller = storyboard!.instantiateViewController(withIdentifier: "scene storyboard id")
    addChild(controller)
    controller.view.frame = ...  // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
    view.addSubview(controller.view)
    controller.didMove(toParent: self)
    

    For more information about why this addChild (previously called addChildViewController) and didMove(toParent:) (previously called didMove(toParentViewController:)) are necessary, see WWDC 2011 video #102 - Implementing UIViewController Containment. In short, you need to ensure that your view controller hierarchy stays in sync with your view hierarchy, and these calls to addChild and didMove(toParent:) ensure this is the case.

    Also see Creating Custom Container View Controllers in the View Controller Programming Guide.


By the way, the above illustrates how to do this programmatically. It is actually much easier if you use the "container view" in Interface Builder.

enter image description here

Then you don't have to worry about any of these containment-related calls, and Interface Builder will take care of it for you.

For Swift 2 implementation, see previous revision of this answer.

HttpClient.GetAsync(...) never returns when using await/async

You are misusing the API.

Here's the situation: in ASP.NET, only one thread can handle a request at a time. You can do some parallel processing if necessary (borrowing additional threads from the thread pool), but only one thread would have the request context (the additional threads do not have the request context).

This is managed by the ASP.NET SynchronizationContext.

By default, when you await a Task, the method resumes on a captured SynchronizationContext (or a captured TaskScheduler, if there is no SynchronizationContext). Normally, this is just what you want: an asynchronous controller action will await something, and when it resumes, it resumes with the request context.

So, here's why test5 fails:

  • Test5Controller.Get executes AsyncAwait_GetSomeDataAsync (within the ASP.NET request context).
  • AsyncAwait_GetSomeDataAsync executes HttpClient.GetAsync (within the ASP.NET request context).
  • The HTTP request is sent out, and HttpClient.GetAsync returns an uncompleted Task.
  • AsyncAwait_GetSomeDataAsync awaits the Task; since it is not complete, AsyncAwait_GetSomeDataAsync returns an uncompleted Task.
  • Test5Controller.Get blocks the current thread until that Task completes.
  • The HTTP response comes in, and the Task returned by HttpClient.GetAsync is completed.
  • AsyncAwait_GetSomeDataAsync attempts to resume within the ASP.NET request context. However, there is already a thread in that context: the thread blocked in Test5Controller.Get.
  • Deadlock.

Here's why the other ones work:

  • (test1, test2, and test3): Continuations_GetSomeDataAsync schedules the continuation to the thread pool, outside the ASP.NET request context. This allows the Task returned by Continuations_GetSomeDataAsync to complete without having to re-enter the request context.
  • (test4 and test6): Since the Task is awaited, the ASP.NET request thread is not blocked. This allows AsyncAwait_GetSomeDataAsync to use the ASP.NET request context when it is ready to continue.

And here's the best practices:

  1. In your "library" async methods, use ConfigureAwait(false) whenever possible. In your case, this would change AsyncAwait_GetSomeDataAsync to be var result = await httpClient.GetAsync("http://stackoverflow.com", HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
  2. Don't block on Tasks; it's async all the way down. In other words, use await instead of GetResult (Task.Result and Task.Wait should also be replaced with await).

That way, you get both benefits: the continuation (the remainder of the AsyncAwait_GetSomeDataAsync method) is run on a basic thread pool thread that doesn't have to enter the ASP.NET request context; and the controller itself is async (which doesn't block a request thread).

More information:

Update 2012-07-13: Incorporated this answer into a blog post.

How to set the color of an icon in Angular Material?

That's because the color input only accepts three attributes: "primary", "accent" or "warn". Hence, you'll have to style the icons the CSS way:

  1. Add a class to style your icon:

    .white-icon {
        color: white;
    }
    /* Note: If you're using an SVG icon, you should make the class target the `<svg>` element */
    .white-icon svg {
        fill: white;
    }
    
  2. Add the class to your icon:

    <mat-icon class="white-icon">menu</mat-icon>
    

How to add a list item to an existing unordered list?

This is the shortest way you can do that

list.push($('<li>', {text: blocks[i] }));
$('ul').append(list);

Where blocks in an array. and you need to loop through the array.

Command to close an application of console?

 //How to start another application from the current application
 Process runProg = new Process();
 runProg.StartInfo.FileName = pathToFile; //the path of the application
 runProg.StartInfo.Arguments = genArgs; //any arguments you want to pass
 runProg.StartInfo.CreateNoWindow = true;
 runProg.Start();

 //How to end the same application from the current application
 int IDstring = System.Convert.ToInt32(runProg.Id.ToString());
 Process tempProc = Process.GetProcessById(IDstring);
 tempProc.CloseMainWindow();
 tempProc.WaitForExit();

How to change the Spyder editor background to dark?

In Spyder 2.3.8 on Ubuntu, I found several settings to do this - each one for a different part of the window... Seems that you can't make all areas dark though.

Editor

Inspector

Console

History

IPython

And the final result looks like this:

Final

How to transfer paid android apps from one google account to another google account

It's totally feasible now. Google now allow you to transfer Android apps between accounts. Please take a look at this link: https://support.google.com/googleplay/android-developer/checklist/3294213?hl=en

How do I empty an input value with jQuery?

To make values empty you can do the following:

 $("#element").val('');

To get the selected value you can do:

var value = $("#element").val();

Where #element is the id of the element you wish to select.

How do I automatically set the $DISPLAY variable for my current session?

Here's something I've just knocked up. It inspects the environment of the last-launched "gnome-session" process (DISPLAY is set correctly when VNC launches a session/window manager). Replace "gnome-session" with the name of whatever process your VNC server launches on startup.

PID=`pgrep -n -u $USER gnome-session`
if [ -n "$PID" ]; then
    export DISPLAY=`awk 'BEGIN{FS="="; RS="\0"}  $1=="DISPLAY" {print $2; exit}' /proc/$PID/environ`
    echo "DISPLAY set to $DISPLAY"
else
    echo "Could not set DISPLAY"
fi
unset PID

You should just be able to drop that in your .bashrc file.

Using HTTPS with REST in Java

The answer of delfuego is the simplest way to solve the certificate problem. But, in my case, one of our third party url (using https), updated their certificate every 2 months automatically. It means that I have to import the cert to our Java trust store manually every 2 months as well. Sometimes it caused production problems.

So, I made a method to solve it with SecureRestClientTrustManager to be able to consume https url without importing the cert file. Here is the method:

     public static String doPostSecureWithHeader(String url, String body, Map headers)
            throws Exception {
        log.info("start doPostSecureWithHeader " + url + " with param " + body);
        long startTime;
        long endTime;
        startTime = System.currentTimeMillis();
        Client client;
        client = Client.create();
        WebResource webResource;
        webResource = null;
        String output = null;
        try{
            SSLContext sslContext = null;
            SecureRestClientTrustManager secureRestClientTrustManager = new SecureRestClientTrustManager();
            sslContext = SSLContext.getInstance("SSL");
            sslContext
            .init(null,
                    new javax.net.ssl.TrustManager[] { secureRestClientTrustManager },
                    null);
            DefaultClientConfig defaultClientConfig = new DefaultClientConfig();
            defaultClientConfig
            .getProperties()
            .put(com.sun.jersey.client.urlconnection.HTTPSProperties.PROPERTY_HTTPS_PROPERTIES,
                    new com.sun.jersey.client.urlconnection.HTTPSProperties(
                            getHostnameVerifier(), sslContext));

            client = Client.create(defaultClientConfig);
            webResource = client.resource(url);

            if(headers!=null && headers.size()>0){
                for (Map.Entry entry : headers.entrySet()){
                    webResource.setProperty(entry.getKey(), entry.getValue());
                }
            }
            WebResource.Builder builder = 
                    webResource.accept("application/json");
            if(headers!=null && headers.size()>0){
                for (Map.Entry entry : headers.entrySet()){
                    builder.header(entry.getKey(), entry.getValue());
                }
            }

            ClientResponse response = builder
                    .post(ClientResponse.class, body);
            output = response.getEntity(String.class);
        }
        catch(Exception e){
            log.error(e.getMessage(),e);
            if(e.toString().contains("One or more of query value parameters are null")){
                output="-1";
            }
            if(e.toString().contains("401 Unauthorized")){
                throw e;
            }
        }
        finally {
            if (client!= null) {
                client.destroy();
            }
        }
        endTime = System.currentTimeMillis();
        log.info("time hit "+ url +" selama "+ (endTime - startTime) + " milliseconds dengan output = "+output);
        return output;
    }

Assign pandas dataframe column dtypes

Since 0.17, you have to use the explicit conversions:

pd.to_datetime, pd.to_timedelta and pd.to_numeric

(As mentioned below, no more "magic", convert_objects has been deprecated in 0.17)

df = pd.DataFrame({'x': {0: 'a', 1: 'b'}, 'y': {0: '1', 1: '2'}, 'z': {0: '2018-05-01', 1: '2018-05-02'}})

df.dtypes

x    object
y    object
z    object
dtype: object

df

   x  y           z
0  a  1  2018-05-01
1  b  2  2018-05-02

You can apply these to each column you want to convert:

df["y"] = pd.to_numeric(df["y"])
df["z"] = pd.to_datetime(df["z"])    
df

   x  y          z
0  a  1 2018-05-01
1  b  2 2018-05-02

df.dtypes

x            object
y             int64
z    datetime64[ns]
dtype: object

and confirm the dtype is updated.


OLD/DEPRECATED ANSWER for pandas 0.12 - 0.16: You can use convert_objects to infer better dtypes:

In [21]: df
Out[21]: 
   x  y
0  a  1
1  b  2

In [22]: df.dtypes
Out[22]: 
x    object
y    object
dtype: object

In [23]: df.convert_objects(convert_numeric=True)
Out[23]: 
   x  y
0  a  1
1  b  2

In [24]: df.convert_objects(convert_numeric=True).dtypes
Out[24]: 
x    object
y     int64
dtype: object

Magic! (Sad to see it deprecated.)

Simulating a click in jQuery/JavaScript on a link

Why not just the good ol' javascript?

$('#element')[0].click()

How do I add a simple onClick event handler to a canvas element?

Alex Answer is pretty neat but when using context rotate it can be hard to trace x,y coordinates, so I have made a Demo showing how to keep track of that.

Basically I am using this function & giving it the angle & the amount of distance traveled in that angel before drawing object.

function rotCor(angle, length){
    var cos = Math.cos(angle);
    var sin = Math.sin(angle);

    var newx = length*cos;
    var newy = length*sin;

    return {
        x : newx,
        y : newy
    };
}

MySQL - DATE_ADD month interval

DATE_ADD works correctly. 1 January plus 6 months is 1 July, just like 1 January plus 1 month is 1 of February.

Between operation is inclusive. So, you are getting everything up to, and including, 1 July. (see also MySQL "between" clause not inclusive?)

What you need to do is subtract 1 day or use < operator instead of between.

What does Ruby have that Python doesn't, and vice versa?

Ruby gets inheritance right with Single Inheritance

Did I mention Ruby has an EPIC community of developers. Ninja theme inspired by Object Oriented Ruby: Classes, Mixins and Jedi.

Ruby gets inheritance right with Single Inheritance! Needing to use multiple inheritance to express domain relationships is a symptom of an improperly designed system. The confusion multiple inheritance creates isn't worth the added functionality.

Say you have a method called kick:

def kick
  puts "kick executed."
end

What if kick is defined in both class Ninjutsu and class Shaolin? Multiple Inheritance fails here and that's why Python fails:

class Mortal < Ninjutsu, Shaolin
  def initialize
    puts "mortal pwnage."
  end
end

In Ruby if you need a Ninja, you create an instance of the Ninja class. If you need a Shaolin master, you create an instance of the Shaolin class.

ninja = Ninjutsu.new
ninja.kick

or 

master = Shaolin.new
master.kick

Ruby gets inheritance right with Mixins

There might be the off chance that both a Ninja and a Shaolin master share the same kick technique. Read that again - both share the same behavior - nothing else! Python would encourage you to roll a whole new class. Not with Ruby! In Ruby you simply use a Mixin:

module Katas
  def kick
    puts "Temporal Whip Kick."
  end
end

and simply Mixin the Katas module into your Ruby Class:

require 'Katas'

class Moral < Ninjutsu
  include Katas

  def initialize
    puts "mortal pwnage."
  end
end

Then the behavior gets shared - which is what you were really going for. Not an entire class. That's the biggest difference between Ruby and Python - Ruby gets inheritance right!

Get unique values from a list in python

To get unique values from your list use code below:

trends = [u'nowplaying', u'PBS', u'PBS', u'nowplaying', u'job', u'debate', u'thenandnow']
output = set(trends)
output = list(output)

IMPORTANT: Approach above won't work if any of items in a list is not hashable which is case for mutable types, for instance list or dict.

trends = [{'super':u'nowplaying'}, u'PBS', u'PBS', u'nowplaying', u'job', u'debate', u'thenandnow']
output = set(trends)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  TypeError: unhashable type: 'dict'

That means that you have to be sure that trends list would always contains only hashable items otherwise you have to use more sophisticated code:

from copy import deepcopy

try:
    trends = [{'super':u'nowplaying'}, [u'PBS',], [u'PBS',], u'nowplaying', u'job', u'debate', u'thenandnow', {'super':u'nowplaying'}]
    output = set(trends)
    output = list(output)
except TypeError:
    trends_copy = deepcopy(trends)
    while trends_copy:
        trend = trends_copy.pop()
        if trends_copy.count(trend) == 0:
            output.append(trend)
print output

Getting or changing CSS class property with Javascript using DOM style

You don't need to add '.' in your class name. This will do

document.getElementsByClassName('col1')

Additionally, since you haven't define the background color via javascript, you won't able to call it directly. You have to use window.getComputedStyle() or jquery to achieve what you are trying to do above.

Here is a working example

http://jsfiddle.net/J9LU8/

First Or Create

firstOrCreate() checks for all the arguments to be present before it finds a match. If not all arguments match, then a new instance of the model will be created.

If you only want to check on a specific field, then use firstOrCreate(['field_name' => 'value']) with only one item in the array. This will return the first item that matches, or create a new one if not matches are found.

The difference between firstOrCreate() and firstOrNew():

  • firstOrCreate() will automatically create a new entry in the database if there is not match found. Otherwise it will give you the matched item.
  • firstOrNew() will give you a new model instance to work with if not match was found, but will only be saved to the database when you explicitly do so (calling save() on the model). Otherwise it will give you the matched item.

Choosing between one or the other depends on what you want to do. If you want to modify the model instance before it is saved for the first time (e.g. setting a name or some mandatory field), you should use firstOrNew(). If you can just use the arguments to immediately create a new model instance in the database without modifying it, you can use firstOrCreate().

"Faceted Project Problem (Java Version Mismatch)" error message

In Spring STS, Right click the project & select "Open Project", This provision do the necessary action on the background & bring the project back to work space.

Thanks & Regards Vengat Maran

How to read a text file from server using JavaScript?

Just a small point, I see some of the answers using innerhtml. I have toyed with a similar idea but decided not too, In the latest version react version the same process is now called dangerouslyinnerhtml, as you are giving your client a way into your OS by presenting html in the app. This could lead to various attacks as well as SQL injection attempts

How to verify if nginx is running or not?

Not sure which guide you are following, but if you check out this page,

https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-14-04-lts

It uses another command

ip addr show eth0 | grep inet | awk '{ print $2; }' | sed 's/\/.*$//' 

and also indicates what result is expected.

Autocomplete syntax for HTML or PHP in Notepad++. Not auto-close, autocompelete

Its supported in notepad++ 5.0+ but not enabled by default. You can enable it from settings -> preferences

Is it possible to import modules from all files in a directory, using a wildcard?

I've used them a few times (in particular for building massive objects splitting the data over many files (e.g. AST nodes)), in order to build them I made a tiny script (which I've just added to npm so everyone else can use it).

Usage (currently you'll need to use babel to use the export file):

$ npm install -g folder-module
$ folder-module my-cool-module/

Generates a file containing:

export {default as foo} from "./module/foo.js"
export {default as default} from "./module/default.js"
export {default as bar} from "./module/bar.js"
...etc

Then you can just consume the file:

import * as myCoolModule from "my-cool-module.js"
myCoolModule.foo()

How to find index of list item in Swift?

While indexOf() works perfectly, it only returns one index.

I was looking for an elegant way to get an array of indexes for elements which satisfy some condition.

Here is how it can be done:

Swift 3:

let array = ["apple", "dog", "log"]

let indexes = array.enumerated().filter {
    $0.element.contains("og")
    }.map{$0.offset}

print(indexes)

Swift 2:

let array = ["apple", "dog", "log"]

let indexes = array.enumerate().filter {
    $0.element.containsString("og")
    }.map{$0.index}

print(indexes)

What does a just-in-time (JIT) compiler do?

I know this is an old thread, but runtime optimization is another important part of JIT compilation that doesn't seemed to be discussed here. Basically, the JIT compiler can monitor the program as it runs to determine ways to improve execution. Then, it can make those changes on the fly - during runtime. Google JIT optimization (javaworld has a pretty good article about it.)

Shorten string without cutting words in JavaScript

Lodash has a function specifically written for this: _.truncate

const truncate = _.truncate
const str = 'The quick brown fox jumps over the lazy dog'

truncate(str, {
  length: 30, // maximum 30 characters
  separator: /,?\.* +/ // separate by spaces, including preceding commas and periods
})

// 'The quick brown fox jumps...'

How do you get git to always pull from a specific branch?

Under [branch "master"], try adding the following to the repo's Git config file (.git/config):

[branch "master"]
    remote = origin
    merge = refs/heads/master

This tells Git 2 things:

  1. When you're on the master branch, the default remote is origin.
  2. When using git pull on the master branch, with no remote and branch specified, use the default remote (origin) and merge in the changes from the remote master branch.

I'm not sure why this setup would've been removed from your configuration, though. You may have to follow the suggestions that other people have posted, too, but this may work (or help at least).

If you don't want to edit the config file by hand, you can use the command-line tool instead:

$ git config branch.master.remote origin
$ git config branch.master.merge refs/heads/master

update columns values with column of another table based on condition

Something like this should do it :

UPDATE table1 
   SET table1.Price = table2.price 
   FROM table1  INNER JOIN  table2 ON table1.id = table2.id

You can also try this:

UPDATE table1 
   SET price=(SELECT price FROM table2 WHERE table1.id=table2.id);

How can I check the size of a file in a Windows batch script?

Create a one line batch file GetFileSize.bat containing

GetFileSize=%~z1

then call it

call GetFileSize  myfile.txt
if (%GetFileSize) == ()     goto No_File
if (%GetFileSize) == (0)    goto No_Data
if (%GetFileSize) GTR 1000  goto Too_Much_Data
rem Etc.

You can even create your test file on the fly to eliminate the pesky required file, note the double percent in the echo statement:

echo set GetFileSize=%%~z1 > %temp%\GetFileSize.bat
call %temp%\GetFileSize  myfile.txt
if (%GetFileSize) GTR 1000  goto Too_Much_Data
rem etc

This latter solution is antispaghetti. So nice. However, more disk writes. Check use count.

The model backing the <Database> context has changed since the database was created

I use the Database.CompatibleWithModel method (available in EF5) to test if the model and DB match before I use it. I call this method just after creating the context...

        // test the context to see if the model is out of sync with the db...
        if (!MyContext.Database.CompatibleWithModel(true))
        {
            // delete the old version of the database...
            if (File.Exists(databaseFileName))
                File.Delete(databaseFileName);
            MyContext.Database.Initialize(true);

            // re-populate database

        }

How to check if a key exists in Json Object and get its value

Try

private boolean hasKey(JSONObject jsonObject, String key) {
    return jsonObject != null && jsonObject.has(key);
}

  try {
        JSONObject jsonObject = new JSONObject(yourJson);
        if (hasKey(jsonObject, "labelData")) {
            JSONObject labelDataJson = jsonObject.getJSONObject("LabelData");
            if (hasKey(labelDataJson, "video")) {
                String video = labelDataJson.getString("video");
            }
        }
    } catch (JSONException e) {

    }

Expression must have class type

Summary: Instead of a.f(); it should be a->f();

In main you have defined a as a pointer to object of A, so you can access functions using the -> operator.

An alternate, but less readable way is (*a).f()

a.f() could have been used to access f(), if a was declared as: A a;

Print the address or pointer for value in C

I have been in this position, especially with new hardware. I suggest you write a little hex dump routine of your own. You will be able to see the data, and the addresses they are at, shown all together. It's good practice and a confidence builder.

target input by type and name (selector)

input[type='checkbox', name='ProductCode']

That's the CSS way and I'm almost sure it will work in jQuery.

Python 2.7: %d, %s, and float()

See String Formatting Operations:

%d is the format code for an integer. %f is the format code for a float.

%s prints the str() of an object (What you see when you print(object)).

%r prints the repr() of an object (What you see when you print(repr(object)).

For a float %s, %r and %f all display the same value, but that isn't the case for all objects. The other fields of a format specifier work differently as well:

>>> print('%10.2s' % 1.123) # print as string, truncate to 2 characters in a 10-place field.
        1.
>>> print('%10.2f' % 1.123) # print as float, round to 2 decimal places in a 10-place field.
      1.12

How to compare strings in an "if" statement?

You're looking for the function strcmp, or strncmp from string.h.

Since strings are just arrays, you need to compare each character, so this function will do that for you:

if (strcmp(favoriteDairyProduct, "cheese") == 0)
{
    printf("You like cheese too!");
}
else
{
    printf("I like cheese more.");
}

Further reading: strcmp at cplusplus.com

HTML checkbox - allow to check only one checkbox

Checkboxes, by design, are meant to be toggled on or off. They are not dependent on other checkboxes, so you can turn as many on and off as you wish.

Radio buttons, however, are designed to only allow one element of a group to be selected at any time.

References:

Checkboxes: MDN Link

Radio Buttons: MDN Link

Rounded Corners Image in Flutter

You can use CircleAvatar Widget with radius:

CircleAvatar(
             radius: 50.0,
             backgroundImage: AssetImage("assets/img1.jpeg"),
            ),

Can't build create-react-app project with custom PUBLIC_URL

Actually the way of setting environment variables is different between different Operating System.

Windows (cmd.exe)

set PUBLIC_URL=http://xxxx.com&&npm start

(Note: the lack of whitespace is intentional.)

Linux, macOS (Bash)

 PUBLIC_URL=http://xxxx.com npm start

Recommended: cross-env

{
  "scripts": {
    "serve": "cross-env PUBLIC_URL=http://xxxx.com npm start"
  }
}

ref: create-react-app/README.md#adding-temporary-environment-variables-in-your-shell at master · facebookincubator/create-react-app

What is the lifetime of a static variable in a C++ function?

Motti is right about the order, but there are some other things to consider:

Compilers typically use a hidden flag variable to indicate if the local statics have already been initialized, and this flag is checked on every entry to the function. Obviously this is a small performance hit, but what's more of a concern is that this flag is not guaranteed to be thread-safe.

If you have a local static as above, and foo is called from multiple threads, you may have race conditions causing plonk to be initialized incorrectly or even multiple times. Also, in this case plonk may get destructed by a different thread than the one which constructed it.

Despite what the standard says, I'd be very wary of the actual order of local static destruction, because it's possible that you may unwittingly rely on a static being still valid after it's been destructed, and this is really difficult to track down.

Run cURL commands from Windows console

If you are not into Cygwin, you can use native Windows builds. Some are here: curl Download Wizard.

SQL - using alias in Group By

Caution that using alias in the Group By (for services that support it, such as postgres) can have unintended results. For example, if you create an alias that already exists in the inner statement, the Group By will chose the inner field name.

-- Working example in postgres
select col1 as col1_1, avg(col3) as col2_1
from
    (select gender as col1, maritalstatus as col2, 
    yearlyincome as col3 from customer) as layer_1
group by col1_1;

-- Failing example in postgres
select col2 as col1, avg(col3)
from
    (select gender as col1, maritalstatus as col2,
    yearlyincome as col3 from customer) as layer_1
group by col1;

How can I count the number of elements of a given value in a matrix?

Here's a list of all the ways I could think of to counting unique elements:

M = randi([1 7], [1500 1]);

Option 1: tabulate

t = tabulate(M);
counts1 = t(t(:,2)~=0, 2);

Option 2: hist/histc

counts2_1 = hist( M, numel(unique(M)) );
counts2_2 = histc( M, unique(M) );

Option 3: accumarray

counts3 = accumarray(M, ones(size(M)), [], @sum);
%# or simply: accumarray(M, 1);

Option 4: sort/diff

[MM idx] = unique( sort(M) );
counts4 = diff([0;idx]);

Option 5: arrayfun

counts5 = arrayfun( @(x)sum(M==x), unique(M) );

Option 6: bsxfun

counts6 = sum( bsxfun(@eq, M, unique(M)') )';

Option 7: sparse

counts7 = full(sparse(M,1,1));

Access Form - Syntax error (missing operator) in query expression

Guys am facing similar issue here is my full code

Do let me know where am i going wrong. Error message: syntax error (Missing operator) in query expression 'AutoID='

This only hapens when i click on login without entering any txt in either combobox and password field.

    Option Compare Database
Option Explicit

Private Sub Login_Click()

If IsNull(Me.ComboUserSelect.Value) Then
    MsgBox "Please select username", vbInformation, "Login ID Required"
    Me.ComboUserSelect.SetFocus
ElseIf IsNull(Me.txtpassword.Value) Then
    MsgBox "please enter password", vbInformation, "Password is Required"
    Me.txtpassword.SetFocus
End If

'============= Declaring the variables ==========='
Dim passwordindatabase As String
Dim typedpassword As String
Dim useraccesstype As String


passwordindatabase = DLookup("Password", "LoginDB", "AutoID=" & ComboUserSelect.Value)
typedpassword = txtpassword.Value
useraccesstype = DLookup("AccessType", "LoginDB", "AutoID=" & ComboUserSelect.Value)


If typedpassword = passwordindatabase Then
    If useraccesstype = "Admin" Then
    DoCmd.OpenForm ("Cam Infra")
    DoCmd.Close acForm, "Login_Form", acSaveNo
    Else
    If useraccesstype = "user" Then
    DoCmd.OpenForm ("Custom_Search_Form")
    DoCmd.Close acForm, "Login_Form", acSaveNo
    End If
    End If
    End If
    

End Sub

Create a copy of a table within the same database DB2

CREATE TABLE NEW_TABLENAME LIKE OLD_TABLENAME;

Works for DB2 V 9.7

Creating table variable in SQL server 2008 R2

@tableName Table variables are alive for duration of the script running only i.e. they are only session level objects.

To test this, open two query editor windows under sql server management studio, and create table variables with same name but different structures. You will get an idea. The @tableName object is thus temporary and used for our internal processing of data, and it doesn't contribute to the actual database structure.

There is another type of table object which can be created for temporary use. They are #tableName objects declared like similar create statement for physical tables:

Create table #test (Id int, Name varchar(50))

This table object is created and stored in temp database. Unlike the first one, this object is more useful, can store large data and takes part in transactions etc. These tables are alive till the connection is open. You have to drop the created object by following script before re-creating it.

IF OBJECT_ID('tempdb..#test') IS NOT NULL
  DROP TABLE #test 

Hope this makes sense !

jQuery - passing value from one input to another

Add ID attributes with same values as name attributes and then you can do this:

$('#first_name').change(function () {
  $('#firstname').val($(this).val());
});

Column calculated from another column?

You can use generated columns from MYSQL 5.7.

Example Usage:

ALTER TABLE tbl_test
ADD COLUMN calc_val INT 
GENERATED ALWAYS AS (((`column1` - 1) * 16) + `column2`) STORED;

VIRTUAL / STORED

  • Virtual: calculated on the fly when a record is read from a table (default)
  • Stored: calculated when a new record is inserted/updated within the table

How to set Java environment path in Ubuntu

It should put java in your path, probably in /usr/bin/java. The easiest way to find it is to open a term and type "which java".

Cannot implicitly convert type 'int' to 'short'

The plus operator converts operands to int first and then does the addition. So the result is the int. You need to cast it back to short explicitly because conversions from a "longer" type to "shorter" type a made explicit, so that you don't loose data accidentally with an implicit cast.

As to why int16 is cast to int, the answer is, because this is what is defined in C# spec. And C# is this way is because it was designed to closely match to the way how CLR works, and CLR has only 32/64 bit arithmetic and not 16 bit. Other languages on top of CLR may choose to expose this differently.

twitter bootstrap typeahead ajax example

i use $().one() for solve this; When page loaded, I send ajax to server and wait to done. Then pass result to function.$().one() is important .Because force typehead.js to attach to input one time. sorry for bad writing.

_x000D_
_x000D_
(($) => {_x000D_
    _x000D_
    var substringMatcher = function(strs) {_x000D_
        return function findMatches(q, cb) {_x000D_
          var matches, substringRegex;_x000D_
          // an array that will be populated with substring matches_x000D_
          matches = [];_x000D_
      _x000D_
          // regex used to determine if a string contains the substring `q`_x000D_
          substrRegex = new RegExp(q, 'i');_x000D_
      _x000D_
          // iterate through the pool of strings and for any string that_x000D_
          // contains the substring `q`, add it to the `matches` array_x000D_
          $.each(strs, function(i, str) {_x000D_
            if (substrRegex.test(str)) {_x000D_
              matches.push(str);_x000D_
            }_x000D_
          });_x000D_
          cb(matches);_x000D_
        };_x000D_
      };_x000D_
      _x000D_
      var states = [];_x000D_
      $.ajax({_x000D_
          url: 'https://baconipsum.com/api/?type=meat-and-filler',_x000D_
          type: 'get'_x000D_
      }).done(function(data) {_x000D_
        $('.typeahead').one().typeahead({_x000D_
            hint: true,_x000D_
            highlight: true,_x000D_
            minLength: 1_x000D_
          },_x000D_
          {_x000D_
            name: 'states',_x000D_
            source: substringMatcher(data)_x000D_
          });_x000D_
      })_x000D_
      _x000D_
_x000D_
})(jQuery);
_x000D_
.tt-query, /* UPDATE: newer versions use tt-input instead of tt-query */_x000D_
.tt-hint {_x000D_
    width: 396px;_x000D_
    height: 30px;_x000D_
    padding: 8px 12px;_x000D_
    font-size: 24px;_x000D_
    line-height: 30px;_x000D_
    border: 2px solid #ccc;_x000D_
    border-radius: 8px;_x000D_
    outline: none;_x000D_
}_x000D_
_x000D_
.tt-query { /* UPDATE: newer versions use tt-input instead of tt-query */_x000D_
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);_x000D_
}_x000D_
_x000D_
.tt-hint {_x000D_
    color: #999;_x000D_
}_x000D_
_x000D_
.tt-menu { /* UPDATE: newer versions use tt-menu instead of tt-dropdown-menu */_x000D_
    width: 422px;_x000D_
    margin-top: 12px;_x000D_
    padding: 8px 0;_x000D_
    background-color: #fff;_x000D_
    border: 1px solid #ccc;_x000D_
    border: 1px solid rgba(0, 0, 0, 0.2);_x000D_
    border-radius: 8px;_x000D_
    box-shadow: 0 5px 10px rgba(0,0,0,.2);_x000D_
}_x000D_
_x000D_
.tt-suggestion {_x000D_
    padding: 3px 20px;_x000D_
    font-size: 18px;_x000D_
    line-height: 24px;_x000D_
    cursor: pointer;_x000D_
}_x000D_
_x000D_
.tt-suggestion:hover {_x000D_
    color: #f0f0f0;_x000D_
    background-color: #0097cf;_x000D_
}_x000D_
_x000D_
.tt-suggestion p {_x000D_
    margin: 0;_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://twitter.github.io/typeahead.js/releases/latest/typeahead.bundle.js"></script>_x000D_
_x000D_
<input class="typeahead" type="text" placeholder="where ?">
_x000D_
_x000D_
_x000D_

How to get javax.comm API?

Oracle Java Communications API Reference - http://www.oracle.com/technetwork/java/index-jsp-141752.html

Official 3.0 Download (Solarix, Linux) - http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-misc-419423.html

Unofficial 2.0 Download (All): http://www.java2s.com/Code/Jar/c/Downloadcomm20jar.htm

Unofficial 2.0 Download (Windows installer) - http://kishor15389.blogspot.hk/2011/05/how-to-install-java-communications.html

In order to ensure there is no compilation error, place the file on your classpath when compiling (-cp command-line option, or check your IDE documentation).

Validate decimal numbers in JavaScript - IsNumeric()

If I'm not mistaken, this should match any valid JavaScript number value, excluding constants (Infinity, NaN) and the sign operators +/- (because they are not actually part of the number as far as I concerned, they are separate operators):

I needed this for a tokenizer, where sending the number to JavaScript for evaluation wasn't an option... It's definitely not the shortest possible regular expression, but I believe it catches all the finer subtleties of JavaScript's number syntax.

/^(?:(?:(?:[1-9]\d*|\d)\.\d*|(?:[1-9]\d*|\d)?\.\d+|(?:[1-9]\d*|\d)) 
(?:[e]\d+)?|0[0-7]+|0x[0-9a-f]+)$/i

Valid numbers would include:

 - 0
 - 00
 - 01
 - 10
 - 0e1
 - 0e01
 - .0
 - 0.
 - .0e1
 - 0.e1
 - 0.e00
 - 0xf
 - 0Xf

Invalid numbers would be

 - 00e1
 - 01e1
 - 00.0
 - 00x0
 - .
 - .e0

Conditional Formatting (IF not empty)

In Excel 2003 you should be able to create a formatting rule like:

=A1<>"" and then drag/copy this to other cells as needed.

If that doesn't work, try =Len(A1)>0.

If there may be spaces in the cell which you will consider blank, then do:

=Len(Trim(A1))>0

Let me know if you can't get any of these to work. I have an old machine running XP and Office 2003, I can fire it up to troubleshoot if needed.

VBA setting the formula for a cell

If you want to make address directly, the worksheet must exist.

Turning off automatic recalculation want help you :)

But... you can get value indirectly...

.FormulaR1C1 = "=INDIRECT(ADDRESS(2,7,1,0,""" & strProjectName & """),FALSE)"

At the time formula is inserted it will return #REF error, because strProjectName sheet does not exist.

But after this worksheet appear Excel will calculate formula again and proper value will be shown.
Disadvantage: there will be no tracking, so if you move the cell or change worksheet name, the formula will not adjust to the changes as in the direct addressing.

How to completely remove a dialog on close

I use this function in all my js projects

You call it: hideAndResetModals("#IdModalDialog")

You define if:

function hideAndResetModals(modalID)
{
    $(modalID).modal('hide');
    clearValidation(modalID); //You implement it if you need it. If not, you can remote this line
    $(modalID).on('hidden.bs.modal', function () 
    {
        $(modalID).find('form').trigger('reset');  
    });
}

Passing 'this' to an onclick event

The code that you have would work, but is executed from the global context, which means that this refers to the global object.

<script type="text/javascript">
var foo = function(param) {
    param.innerHTML = "Not a button";
};
</script>
<button onclick="foo(this)" id="bar">Button</button>

You can also use the non-inline alternative, which attached to and executed from the specific element context which allows you to access the element from this.

<script type="text/javascript">
document.getElementById('bar').onclick = function() {
    this.innerHTML = "Not a button";
};
</script>
<button id="bar">Button</button>

Set a border around a StackPanel.

You set DockPanel.Dock="Top" to the StackPanel, but the StackPanel is not a child of the DockPanel... the Border is. Your docking property is being ignored.

If you move DockPanel.Dock="Top" to the Border instead, both of your problems will be fixed :)

Why I get 411 Length required error?

Change the way you requested the method from POST to GET ..

Set attribute without value

Not sure if this is really beneficial or why I prefer this style but what I do (in vanilla js) is:

document.querySelector('#selector').toggleAttribute('data-something');

This will add the attribute in all lowercase without a value or remove it if it already exists on the element.

https://developer.mozilla.org/en-US/docs/Web/API/Element/toggleAttribute

How do I compare two columns for equality in SQL Server?

A solution avoiding CASE WHEN is to use COALESCE.

SELECT
    t1.Col2 AS t1Col2,
    t2.Col2 AS t2Col2,
    COALESCE(NULLIF(t1.Col2, t2.Col2),NULLIF(t2.Col2, t1.Col2)) as NULL_IF_SAME
 FROM @t1 AS t1
JOIN @t2 AS t2 ON t1.ColID = t2.ColID

NULL_IF_SAME column will give NULL for all rows where t1.col2 = t2.col2 (including NULL). Though this is not more readable than CASE WHEN expression, it is ANSI SQL.

Just for the sake of fun, if one wants to have boolean bit values of 0 and 1 (though it is not very readable, hence not recommended), one can use (which works for all datatypes):

1/ISNULL(LEN(COALESCE(NULLIF(t1.Col2, t2.Col2),NULLIF(t2.Col2, t1.Col2)))+2,1) as BOOL_BIT_SAME.

Now if you have one of the numeric data types and want bits, in the above LEN function converts to string first which may be problematic,so instead this should work:

1/(CAST(ISNULL(ABS(COALESCE(NULLIF(t1.Col2, t2.Col2),NULLIF(t2.Col2, t1.Col2)))+1,0)as bit)+1) as FAST_BOOL_BIT_SAME_NUMERIC

Above will work for Integers without CAST.

NOTE: also in SQLServer 2012, we have IIF function.

JavaScript null check

In your case use data==null (which is true ONLY for null and undefined - on second picture focus on rows/columns null-undefined)

_x000D_
_x000D_
function test(data) {_x000D_
    if (data != null) {_x000D_
        console.log('Data: ', data);_x000D_
    }_x000D_
}_x000D_
_x000D_
test();          // the data=undefined_x000D_
test(null);      // the data=null_x000D_
test(undefined); // the data=undefined_x000D_
_x000D_
test(0); _x000D_
test(false); _x000D_
test('something');
_x000D_
_x000D_
_x000D_

Here you have all (src):

if

enter image description here

== (its negation !=)

enter image description here

=== (its negation !==)

enter image description here

How to send 100,000 emails weekly?

Short answer: While it's technically possible to send 100k e-mails each week yourself, the simplest, easiest and cheapest solution is to outsource this to one of the companies that specialize in it (I did say "cheapest": there's no limit to the amount of development time (and therefore money) that you can sink into this when trying to DIY).

Long answer: If you decide that you absolutely want to do this yourself, prepare for a world of hurt (after all, this is e-mail/e-fail we're talking about). You'll need:

  • e-mail content that is not spam (otherwise you'll run into additional major roadblocks on every step, even legal repercussions)
  • in addition, your content should be easy to distinguish from spam - that may be a bit hard to do in some cases (I heard that a certain pharmaceutical company had to all but abandon e-mail, as their brand names are quite common in spams)
  • a configurable SMTP server of your own, one which won't buckle when you dump 100k e-mails onto it (your ISP's upstream server won't be sufficient here and you'll make the ISP violently unhappy; we used two dedicated boxes)
  • some mail wrapper (e.g. PhpMailer if PHP's your poison of choice; using PHP's mail() is horrible enough by itself)
  • your own sender function to run in a loop, create the mails and pass them to the wrapper (note that you may run into PHP's memory limits if your app has a memory leak; you may need to recycle the sending process periodically, or even better, decouple the "creating e-mails" and "sending e-mails" altogether)

Surprisingly, that was the easy part. The hard part is actually sending it:

  • some servers will ban you when you send too many mails close together, so you need to shuffle and watch your queue (e.g. send one mail to [email protected], then three to other domains, only then another to [email protected])
  • you need to have correct PTR, SPF, DKIM records
  • handling remote server timeouts, misconfigured DNS records and other network pleasantries
  • handling invalid e-mails (and no, regex is the wrong tool for that)
  • handling unsubscriptions (many legitimate newsletters have been reclassified as spam due to many frustrated users who couldn't unsubscribe in one step and instead chose to "mark as spam" - the spam filters do learn, esp. with large e-mail providers)
  • handling bounces and rejects ("no such mailbox [email protected]","mailbox [email protected] full")
  • handling blacklisting and removal from blacklists (Sure, you're not sending spam. Some recipients won't be so sure - with such large list, it will happen sometimes, no matter what precautions you take. Some people (e.g. your not-so-scrupulous competitors) might even go as far to falsely report your mailings as spam - it does happen. On average, it takes weeks to get yourself removed from a blacklist.)

And to top it off, you'll have to manage the legal part of it (various federal, state, and local laws; and even different tangles of laws once you send outside the U.S. (note: you have no way of finding if [email protected] lives in Southwest Elbonia, the country with world's most draconian antispam laws)).

I'm pretty sure I missed a few heads of this hydra - are you still sure you want to do this yourself? If so, there'll be another wave, this time merely the annoying problems inherent in sending an e-mail. (You see, SMTP is a store-and-forward protocol, which means that your e-mail will be shuffled across many SMTP servers around the Internet, in the hope that the next one is a bit closer to the final recipient. Basically, the e-mail is sent to an SMTP server, which puts it into its forward queue; when time comes, it will forward it further to a different SMTP server, until it reaches the SMTP server for the given domain. This forward could happen immediately, or in a few minutes, or hours, or days, or never.) Thus, you'll see the following issues - most of which could happen en route as well as at the destination:

  • the remote SMTP servers don't want to talk to your SMTP server
  • your mails are getting marked as spam (<blink> is not your friend here, nor is <font color=...>)
  • your mails are delivered days, even weeks late (contrary to popular opinion, SMTP is designed to make a best effort to deliver the message sometime in the future - not to deliver it now)
  • your mails are not delivered at all (already sent from e-mail server on hop #4, not sent yet from server on hop #5, the server that currently holds the message crashes, data is lost)
  • your mails are mangled by some braindead server en route (this one is somewhat solvable with base64 encoding, but then the size goes up and the e-mail looks more suspicious)
  • your mails are delivered and the recipients seem not to want them ("I'm sure I didn't sign up for this, I remember exactly what I did a year ago" (of course you do, sir))
  • users with various versions of Microsoft Outlook and its special handling of Internet mail
  • wizard's apprentice mode (a self-reinforcing positive feedback loop - in other words, automated e-mails as replies to automated e-mails as replies to...; you really don't want to be the one to set this off, as you'd anger half the internet at yourself)

and it'll be your job to troubleshoot and solve this (hint: you can't, mostly). The people who run a legit mass-mailing businesses know that in the end you can't solve it, and that they can't solve it either - and they have the reasons well researched, documented and outlined (maybe even as a Powerpoint presentation - complete with sounds and cool transitions - that your bosses can understand), as they've had to explain this a million times before. Plus, for the problems that are actually solvable, they know very well how to solve them.

If, after all this, you are not discouraged and still want to do this, go right ahead: it's even possible that you'll find a better way to do this. Just know that the road ahead won't be easy - sending e-mail is trivial, getting it delivered is hard.

How to Convert datetime value to yyyymmddhhmmss in SQL server?

20090320093349

SELECT CONVERT(VARCHAR,@date,112) + 
LEFT(REPLACE(CONVERT(VARCHAR,@date,114),':',''),6)

How to output HTML from JSP <%! ... %> block?

You can't use the 'out' variable (nor any of the other "predeclared" scriptlet variables) inside directives.

The JSP page gets translated by your webserver into a Java servlet. Inside tomcats, for instance, everything inside scriptlets (which start "<%"), along with all the static HTML, gets translated into one giant Java method which writes your page, line by line, to a JspWriter instance called "out". This is why you can use the "out" parameter directly in scriptlets. Directives, on the other hand (which start with "<%!") get translated as separate Java methods.

As an example, a very simple page (let's call it foo.jsp):

<html>
    <head/>
    <body>
        <%!
            String someOutput() {
                return "Some output";
            }
        %>
        <% someOutput(); %>
    </body>
</html>

would end up looking something like this (with a lot of the detail ignored for clarity):

public final class foo_jsp
{
    // This is where the request comes in
    public void _jspService(HttpServletRequest request, HttpServletResponse response) 
        throws IOException, ServletException
    {
        // JspWriter instance is gotten from a factory
        // This is why you can use 'out' directly in scriptlets
        JspWriter out = ...; 

        // Snip

        out.write("<html>");
        out.write("<head/>");
        out.write("<body>");
        out.write(someOutput()); // i.e. write the results of the method call
        out.write("</body>");
        out.write("</html>");
    }

    // Directive gets translated as separate method - note
    // there is no 'out' variable declared in scope
    private String someOutput()
    {
        return "Some output";
    }
}

How can I loop through enum values for display in radio buttons?

Two options:

for (let item in MotifIntervention) {
    if (isNaN(Number(item))) {
        console.log(item);
    }
}

Or

Object.keys(MotifIntervention).filter(key => !isNaN(Number(MotifIntervention[key])));

(code in playground)


Edit

String enums look different than regular ones, for example:

enum MyEnum {
    A = "a",
    B = "b",
    C = "c"
}

Compiles into:

var MyEnum;
(function (MyEnum) {
    MyEnum["A"] = "a";
    MyEnum["B"] = "b";
    MyEnum["C"] = "c";
})(MyEnum || (MyEnum = {}));

Which just gives you this object:

{
    A: "a",
    B: "b",
    C: "c"
}

You can get all the keys (["A", "B", "C"]) like this:

Object.keys(MyEnum);

And the values (["a", "b", "c"]):

Object.keys(MyEnum).map(key => MyEnum[key])

Or using Object.values():

Object.values(MyEnum)

Run JavaScript when an element loses focus

onblur is the opposite of onfocus.

Open application after clicking on Notification

use this:

    Notification mBuilder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_music)
                    .setContentTitle(songName).build();


    mBuilder.contentIntent=  PendingIntent.getActivity(this, 0,
            new Intent(this, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);

contentIntent will take care of openning activity when notification clicked

cut or awk command to print first field of first row

awk, sed, pipe, that's heavy

set `cat /etc/*release`; echo $1

How to restart a single container with docker-compose

To restart a service with changes here are the steps that I performed:

docker-compose stop -t 1 worker
docker-compose build worker
docker-compose up --no-start worker
docker-compose start worker

How is malloc() implemented internally?

Simplistically malloc and free work like this:

malloc provides access to a process's heap. The heap is a construct in the C core library (commonly libc) that allows objects to obtain exclusive access to some space on the process's heap.

Each allocation on the heap is called a heap cell. This typically consists of a header that hold information on the size of the cell as well as a pointer to the next heap cell. This makes a heap effectively a linked list.

When one starts a process, the heap contains a single cell that contains all the heap space assigned on startup. This cell exists on the heap's free list.

When one calls malloc, memory is taken from the large heap cell, which is returned by malloc. The rest is formed into a new heap cell that consists of all the rest of the memory.

When one frees memory, the heap cell is added to the end of the heap's free list. Subsequent malloc's walk the free list looking for a cell of suitable size.

As can be expected the heap can get fragmented and the heap manager may from time to time, try to merge adjacent heap cells.

When there is no memory left on the free list for a desired allocation, malloc calls brk or sbrk which are the system calls requesting more memory pages from the operating system.

Now there are a few modification to optimize heap operations.

  • For large memory allocations (typically > 512 bytes, the heap manager may go straight to the OS and allocate a full memory page.
  • The heap may specify a minimum size of allocation to prevent large amounts of fragmentation.
  • The heap may also divide itself into bins one for small allocations and one for larger allocations to make larger allocations quicker.
  • There are also clever mechanisms for optimizing multi-threaded heap allocation.

Python FileNotFound

try block should be around open. Not around prompt.

while True:
    prompt = input("\n Hello to Sudoku valitator,"
    "\n \n Please type in the path to your file and press 'Enter': ")
    try:
        sudoku = open(prompt, 'r').readlines()
    except FileNotFoundError:
        print("Wrong file or file path")
    else:
        break

Autowiring fails: Not an managed Type

You should extend the scope of the component-scan e.g. <context:component-scan base-package="at.naviclean" /> since you placed the entities in package at.naviclean.domain;

This should help you to get rid the exeption: Not an managed type: class at.naviclean.domain.Kassa

For further debugging you could try to dump the application context (see javadoc) to explore which classes have been detected by the component-scan if some are still no recognized check their annotation (@Service, @Component etc.)

EDIT:

You also need to add the classes to your persistence.xml

<persistence-unit>
    <class>at.naviclean.domain.Kassa</class>
     ...
</persistence-unit>

Reload the page after ajax success

BrixenDK is right.

.ajaxStop() callback executed when all ajax call completed. This is a best place to put your handler.

$(document).ajaxStop(function(){
    window.location.reload();
});

Remove URL parameters without refreshing page

Here is an ES6 one liner which preserves the location hash and does not pollute browser history by using replaceState:

(l=>{window.history.replaceState({},'',l.pathname+l.hash)})(location)

UPDATE and REPLACE part of a string

For anyone want to replace your script.

update dbo.[TABLE_NAME] set COLUMN_NAME= replace(COLUMN_NAME, 'old_value', 'new_value') where COLUMN_NAME like %CONDITION%

Get the current language in device

If you want to get the selected language of your device, this might help you:

Locale.getDefault().getDisplayLanguage();

How do I bottom-align grid elements in bootstrap fluid layout

You can use flex:

@media (min-width: 768px) {
  .row-fluid {
    display: flex;
    align-items: flex-end;
  }
}

How do I make an editable DIV look like a text field?

The problem with all these is they don't address if the lines of text are long and much wider that the div overflow:auto does not ad a scroll bar that works right. Here is the perfect solution I found:

Create two divs. An inner div that is wide enough to handle the widest line of text and then a smaller outer one which acts at the holder for the inner div:

<div style="border:2px inset #AAA;cursor:text;height:120px;overflow:auto;width:500px;">
    <div style="width:800px;">

     now really long text like this can be put in the text area and it will really <br/>
     look and act more like a real text area bla bla bla <br/>

    </div>
</div>

Change Input to Upper Case

<input id="name" data-upper type="text"/>
<input id="middle" data-upper type="text"/>
<input id="sur" data-upper type="text"/>

Upper the text on dynamically created element which has attribute upper and when keyup action happens

$(document.body).on('keyup', '[data-upper]', function toUpper() {
  this.value = this.value.toUpperCase();
});

At runtime, find all classes in a Java application that extend a base class

Thanks all who answered this question.

It seems this is indeed a tough nut to crack. I ended up giving up and creating a static array and getter in my baseclass.

public abstract class Animal{
    private static Animal[] animals= null;
    public static Animal[] getAnimals(){
        if (animals==null){
            animals = new Animal[]{
                new Dog(),
                new Cat(),
                new Lion()
            };
        }
        return animals;
    }
}

It seems that Java just isn't set up for self-discoverability the way C# is. I suppose the problem is that since a Java app is just a collection of .class files out in a directory / jar file somewhere, the runtime doesn't know about a class until it's referenced. At that time the loader loads it -- what I'm trying to do is discover it before I reference it which is not possible without going out to the file system and looking.

I always like code that can discover itself instead of me having to tell it about itself, but alas this works too.

Thanks again!

Remove a file from a Git repository without deleting it from the local filesystem

Git lets you ignore those files by assuming they are unchanged. This is done by running the git update-index --assume-unchanged path/to/file.txt command. Once marking a file as such, git will completely ignore any changes on that file; they will not show up when running git status or git diff, nor will they ever be committed.

(From https://help.github.com/articles/ignoring-files)

Hence, not deleting it, but ignoring changes to it forever. I think this only works locally, so co-workers can still see changes to it unless they run the same command as above. (Still need to verify this though.)

Note: This isn't answering the question directly, but is based on follow up questions in the comments of the other answers.

Focus Input Box On Load

Just a heads up - you can now do this with HTML5 without JavaScript for browsers that support it:

<input type="text" autofocus>

You probably want to start with this and build onto it with JavaScript to provide a fallback for older browsers.

Extract every nth element of a vector

I think you are asking two things which are not necessarily the same

I want to extract every 6th element of the original

You can do this by indexing a sequence:

foo <- 1:120
foo[1:20*6]

I would like to create a vector in which each element is the i+6th element of another vector.

An easy way to do this is to supplement a logical factor with FALSEs until i+6:

foo <- 1:120
i <- 1
foo[1:(i+6)==(i+6)]
[1]   7  14  21  28  35  42  49  56  63  70  77  84  91  98 105 112 119

i <- 10
foo[1:(i+6)==(i+6)]
[1]  16  32  48  64  80  96 112

"The file "MyApp.app" couldn't be opened because you don't have permission to view it" when running app in Xcode 6 Beta 4

I updated my cocoa pods and added new supported architectures in build settings and that fixed it.

How to generate class diagram from project in Visual Studio 2013?

Right click on the project in solution explorer or class view window --> "View" --> "View Class Diagram"

What is a constant reference? (not a reference to a constant)

The clearest answer. Does “X& const x” make any sense?

No, it is nonsense

To find out what the above declaration means, read it right-to-left: “x is a const reference to a X”. But that is redundant — references are always const, in the sense that you can never reseat a reference to make it refer to a different object. Never. With or without the const.

In other words, “X& const x” is functionally equivalent to “X& x”. Since you’re gaining nothing by adding the const after the &, you shouldn’t add it: it will confuse people — the const will make some people think that the X is const, as if you had said “const X& x”.

jQuery: Get selected element tag name

nodeName will give you the tag name in uppercase, while localName will give you the lower case.

$("yourelement")[0].localName 

will give you : yourelement instead of YOURELEMENT

Should ol/ul be inside <p> or outside?

GO here http://validator.w3.org/ upload your html file and it will tell you what is valid and what is not.

How to change Elasticsearch max memory size

Previous answers were insufficient in my case, probably because I'm on Debian 8, while they were referred to some previous distribution.

On Debian 8 modify the service script normally place in /usr/lib/systemd/system/elasticsearch.service, and add Environment=ES_HEAP_SIZE=8G just below the other "Environment=*" lines.

Now reload the service script with systemctl daemon-reload and restart the service. The job should be done!

How do you check whether a number is divisible by another number (Python)?

The simplest way is to test whether a number is an integer is int(x) == x. Otherwise, what David Heffernan said.

The best node module for XML parsing

You can try xml2js. It's a simple XML to JavaScript object converter. It gets your XML converted to a JS object so that you can access its content with ease.

Here are some other options:

  1. libxmljs
  2. xml-stream
  3. xmldoc
  4. cheerio – implements a subset of core jQuery for XML (and HTML)

I have used xml2js and it has worked fine for me. The rest you might have to try out for yourself.

How can I generate random number in specific range in Android?

int min = 65;
int max = 80;

Random r = new Random();
int i1 = r.nextInt(max - min + 1) + min;

Note that nextInt(int max) returns an int between 0 inclusive and max exclusive. Hence the +1.

Array length in angularjs returns undefined

Make it like this:

$scope.users.data.length;

If Cell Starts with Text String... Formula

I know this is a really old post, but I found it in searching for a solution to the same problem. I don't want a nested if-statement, and Switch is apparently newer than the version of Excel I'm using. I figured out what was going wrong with my code, so I figured I'd share here in case it helps someone else.

I remembered that VLOOKUP requires the source table to be sorted alphabetically/numerically for it to work. I was initially trying to do this...

=LOOKUP(LOWER(LEFT($T$3, 1)),  {"s","l","m"}, {-1,1,0})

and it started working when I did this...

=LOOKUP(LOWER(LEFT($T$3, 1)),  {"l","m","s"}, {1,0,-1})

I was initially thinking the last value might turn out to be a default, so I wanted the zero at the last place. That doesn't seem to be the behavior anyway, so I just put the possible matches in order, and it worked.

Edit: As a final note, I see that the example in the original post has letters in alphabetical order, but I imagine the real use case might have been different if the error was happening and the letters A, B, and C were just examples.

How to compile the finished C# project and then run outside Visual Studio?

The easiest way is:

  • Find the drop-down box at the top of Visual Studio's window that says Debug
  • Select Release
  • Hit F6 to build it
  • Switch back to Debug and then close Visual Studio
  • Open Windows Explorer and navigate to your project's folder (My Documents\Visual Studio 200x\Projects\my_project\)
  • Now go to bin\Release\ and copy the executable from there to wherever you want to store it
  • Make shortcuts as appropriate and enjoy your new game! :)

node.js: read a text file into an array. (Each line an item in the array.)

With a BufferedReader, but the function should be asynchronous:

var load = function (file, cb){
    var lines = [];
    new BufferedReader (file, { encoding: "utf8" })
        .on ("error", function (error){
            cb (error, null);
        })
        .on ("line", function (line){
            lines.push (line);
        })
        .on ("end", function (){
            cb (null, lines);
        })
        .read ();
};

load ("file", function (error, lines){
    if (error) return console.log (error);
    console.log (lines);
});

Simple post to Web Api

It's been quite sometime since I asked this question. Now I understand it more clearly, I'm going to put a more complete answer to help others.

In Web API, it's very simple to remember how parameter binding is happening.

  • if you POST simple types, Web API tries to bind it from the URL
  • if you POST complex type, Web API tries to bind it from the body of the request (this uses a media-type formatter).

  • If you want to bind a complex type from the URL, you'll use [FromUri] in your action parameter. The limitation of this is down to how long your data going to be and if it exceeds the url character limit.

    public IHttpActionResult Put([FromUri] ViewModel data) { ... }

  • If you want to bind a simple type from the request body, you'll use [FromBody] in your action parameter.

    public IHttpActionResult Put([FromBody] string name) { ... }

as a side note, say you are making a PUT request (just a string) to update something. If you decide not to append it to the URL and pass as a complex type with just one property in the model, then the data parameter in jQuery ajax will look something like below. The object you pass to data parameter has only one property with empty property name.

var myName = 'ABC';
$.ajax({url:.., data: {'': myName}});

and your web api action will look something like below.

public IHttpActionResult Put([FromBody] string name){ ... }

This asp.net page explains it all. http://www.asp.net/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api

How do I convert csv file to rdd

How about this?

val Delimeter = ","
val textFile = sc.textFile("data.csv").map(line => line.split(Delimeter))

Is it possible to disable scrolling on a ViewPager

In my case of using ViewPager 2 alpha 2 the below snippet works

viewPager.isUserInputEnabled = false

Ability to disable user input (setUserInputEnabled, isUserInputEnabled)

refer to this for more changes in viewpager2 1.0.0-alpha02

Also some changes were made latest version ViewPager 2 alpha 4

orientation and isUserScrollable attributes are no longer part of SavedState

refer to this for more changes in viewpager2#1.0.0-alpha04

How to get object size in memory?

I don't think you can get it directly, but there are a few ways to find it indirectly.

One way is to use the GC.GetTotalMemory method to measure the amount of memory used before and after creating your object. This won't be perfect, but as long as you control the rest of the application you may get the information you are interested in.

Apart from that you can use a profiler to get the information or you could use the profiling api to get the information in code. But that won't be easy to use I think.

See Find out how much memory is being used by an object in C#? for a similar question.

Undoing accidental git stash pop

If your merge was not too complicated another option would be to:

  1. Move all the changes including the merge changes back to stash using "git stash"
  2. Run the merge again and commit your changes (without the changes from the dropped stash)
  3. Run a "git stash pop" which should ignore all the changes from your previous merge since the files are identical now.

After that you are left with only the changes from the stash you dropped too early.

How to add multiple font files for the same font?

If you are using Google fonts I would suggest the following.

If you want the fonts to run from your localhost or server you need to download the files.

Instead of downloading the ttf packages in the download links, use the live link they provide, for example:

http://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,300italic,400italic,600italic

Paste the URL in your browser and you should get a font-face declaration similar to the first answer.

Open the URLs provided, download and rename the files.

Stick the updated font-face declarations with relative paths to the woff files in your CSS, and you are done.

MySQL - SELECT * INTO OUTFILE LOCAL ?

You can achieve what you want with the mysql console with the -s (--silent) option passed in.

It's probably a good idea to also pass in the -r (--raw) option so that special characters don't get escaped. You can use this to pipe queries like you're wanting.

mysql -u username -h hostname -p -s -r -e "select concat('this',' ','works')"

EDIT: Also, if you want to remove the column name from your output, just add another -s (mysql -ss -r etc.)

ssh_exchange_identification: Connection closed by remote host under Git bash

Disconnecting and reconnecting to the current network worked for me.

Where does Vagrant download its .box files to?

The actual .box file is deleted by Vagrant once the download and box installation is complete. As mentioned in other answers, whilst downloading, the .box file is stored as:

~/.vagrant.d/tmp/boxXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

where the file name is 'box' followed by a 40 byte hexadecimal hash. A temporary file on my system for example, is:

~/.vagrant.d/tmp/boxc74a85fe4af3197a744851517c6af4d4959db77f

As far as I can tell, this file is never saved with a *.box extension, which explains why the searches above failed to locate it. There are two ways to retrieve the actual box file:

  1. Download the .box file from vagrantcloud.com

    1. Find the box you're interested in on the atlas. For example, https://atlas.hashicorp.com/ubuntu/boxes/trusty64/versions/20150530.0.1
    2. Replace the domain name with vagrantcloud.com. So https://atlas.hashicorp.com/ubuntu/boxes/trusty64/versions/20150530.0.1 becomes https://vagrantcloud.com/ubuntu/boxes/trusty64/versions/20150530.0.1/providers/virtualbox.box.
    3. Add /providers/virtualbox.box to the end of that URL. So https://vagrantcloud.com/ubuntu/boxes/trusty64/versions/20150530.0.1 becomes https://vagrantcloud.com/ubuntu/boxes/trusty64/versions/20150530.0.1/providers/virtualbox.box
    4. Save the .box file
    5. Use the .box as you wish, for example, hosting it yourself and pointing config.vm.box_url to the URL. OR
  2. Get the .box directly from Vagrant

    This requires you to modify the ruby source to prevent Vagrant from deleting the box after successful download.

    1. Locate the box_add.rb file in your Vagrant installation directory. On my system it's located at /Applications/Vagrant/embedded/gems/gems/vagrant-1.5.2/lib/vagrant/action/builtin/box_add.rb
    2. Find the box_add function. Within the box_add function, there is a block that reads:

      ensure # Make sure we delete the temporary file after we add it, # unless we were interrupted, in which case we keep it around # so we can resume the download later. if !@download_interrupted @logger.debug("Deleting temporary box: #{box_url}") begin box_url.delete if box_url rescue Errno::ENOENT # Not a big deal, the temp file may not actually exist end end

    3. Comment this block out.
    4. Add another box using vagrant add box <boxname>.
    5. Wait for it to download. You can watch it save in the ~/.vagrant.d/tmp/ directory as a boxXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX file.
    6. Rename the the file to something more useful. Eg, mv boxXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX trusty64.box.

Why would you want this?

For me, this has been useful to retrieve the .box file so it can be hosted on local, fast infrastructure as opposed to downloading from HashiCorp's Atlas box catalog or another box provider.

This really should be part of the default Vagrant functionality as it has a very definitive use case.

How do I compare version numbers in Python?

... and getting back to easy ... for simple scripts you can use:

import sys
needs = (3, 9) # or whatever
pvi = sys.version_info.major, sys.version_info.minor    

later in your code

try:
    assert pvi >= needs
except:
    print("will fail!")
    # etc.

Countdown timer using Moment js

In the last statement you are converting the duration to time which also considers the timezone. I assume that your timezone is +530, so 5 hours and 30 minutes gets added to 30 minutes. You can do as given below.

var eventTime= 1366549200; // Timestamp - Sun, 21 Apr 2013 13:00:00 GMT
var currentTime = 1366547400; // Timestamp - Sun, 21 Apr 2013 12:30:00 GMT
var diffTime = eventTime - currentTime;
var duration = moment.duration(diffTime*1000, 'milliseconds');
var interval = 1000;

setInterval(function(){
  duration = moment.duration(duration - interval, 'milliseconds');
    $('.countdown').text(duration.hours() + ":" + duration.minutes() + ":" + duration.seconds())
}, interval);

How to set default value to all keys of a dict object in python?

Use defaultdict

from collections import defaultdict
a = {} 
a = defaultdict(lambda:0,a)
a["anything"] # => 0

This is very useful for case like this,where default values for every key is set as 0:

results ={ 'pre-access' : {'count': 4, 'pass_count': 2},'no-access' : {'count': 55, 'pass_count': 19}
for k,v in results.iteritems():
  a['count'] += v['count']
  a['pass_count'] += v['pass_count']

Custom Cell Row Height setting in storyboard is not responding

For dynamic cells, rowHeight set on the UITableView always overrides the individual cells' rowHeight. Just calculate the dynamic height if the content inside the row.

how to pass parameter from @Url.Action to controller function

public ActionResult CreatePerson (string id)

window.location.href = '@Url.Action("CreatePerson", "Person" , new {id = "ID"})'.replace("ID",id);

public ActionResult CreatePerson (int id)

window.location.href = '@Url.Action("CreatePerson", "Person" , new {id = "ID"})'.replace("ID", parseInt(id));

HTTP Error 401.2 - Unauthorized You are not authorized to view this page due to invalid authentication headers

Open Project properties by selecting project then go to

View>Properties Windows

and make sure Anonymous Authentication is Enabled

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How to split a number into individual digits in c#?

Substring and Join methods are usable for this statement.

string no = "12345";
string [] numberArray = new string[no.Length];
int counter = 0;

   for (int i = 0; i < no.Length; i++)
   {
     numberArray[i] = no.Substring(counter, 1); // 1 is split length
     counter++;
   }

Console.WriteLine(string.Join(" ", numberArray)); //output >>> 0 1 2 3 4 5

How to change dataframe column names in pyspark?

df.withColumnRenamed('age', 'age2')