How do I put variables inside javascript strings

Question

s    hello  s  how are you doing     my name    That s how you do it in python  How can you do that in javascript node js

User · Answer

if you are using ES6  the you should use the Template literals     you can do this let sentence    My name is    user name    Nice to meet you     read more here  https   developer mozilla org en-US docs Web JavaScript Reference Template literals

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I wrote a function which solves the problem precisely   First argument is the string that wanted to be parameterized  You should put your variables in this string like this format   s1   s2       s12    Other arguments are the parameters respectively for that string            example parameterizedString  my name is  s1 and surname is  s2    John    Doe        return  my name is John and surname is Doe         firstArgument  String  like  my name is  s1 and surname is  s2      otherArguments  String   Number      returns  String      const parameterizedString       args    gt      const str   args 0     const params   args filter  arg  index    gt  index     0     if   str  return       return str replace   s 0-9   g  matchedStr   gt        const variableIndex   matchedStr replace   s       - 1      return params variableIndex             Examples  parameterizedString  my name is  s1 and surname is  s2    John    Doe       returns  my name is John and surname is Doe   parameterizedString  this s1  s2  s3     method    sooo    goood       returns  this method sooo goood    If variable position changes in that string  this function supports it too without changing the function parameters   parameterizedString  i have  s2  s1 and  s4  s3     books   5   pencils    6       returns  i have 5 books and 6 pencils

User · Answer

Try sprintf in JS  or you could use this gist

User · Answer

util format does this    It will be part of v0 5 3 and can be used like this   var uri   util format  http s    s s           useSSL  s       apiBase  path

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If you are using node js  console log   takes format string as a first parameter    console log  count   d   count

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x000D   x000D  const format       args    gt  args shift   replace     jsd   g  x   gt  x       j    JSON stringify args shift      args shift    x000D   x000D  const name    Csaba  x000D  const formatted   format  Hi  s  today is  s and your data is  j   name  Date     data   country   Hungary   city   Budapest     x000D   x000D  console log formatted  x000D   x000D   x000D

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As of node js  gt 4 0 it gets more compatible with ES6 standard  where string manipulation greatly improved   The answer to the original question can be as simple as   var s    hello   my name   how are you doing      note  tilt   instead of single quote     Where the string can spread multiple lines  it makes templates or HTML XML processes quite easy   More details and more capabilitie about it  Template literals are string literals at mozilla org

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var user    your name   var s    hello     user      how are you doing

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With Node js v4   you can use ES6 s Template strings  var my name    John   var s    hello   my name   how are you doing   console log s      prints hello John  how are you doing   You need to wrap string within backtick    instead of

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A few ways to extend String prototype  or use ES2015 template literals    x000D   x000D  var result   document querySelector   result    x000D     ----------------------------------------------------------------------------------- x000D     Classic x000D  String prototype format   String prototype format    x000D    function      x000D      var args   Array prototype slice call arguments   x000D      var replacer   function  a  return args a substr 1 -1     x000D      return this replace      d   gm  replacer  x000D     x000D  result textContent    x000D     hello  1   2  format   world      how are you      x000D   x000D     ES2015 1 x000D   use strict  x000D  String prototype format2   String prototype format2    x000D    function    merge    return this replace     d  g  r   gt  merge r slice 1 -1       x000D  result textContent      nHi there  1   2  format2   sir      I  m fine  thnx     x000D   x000D     ES2015 2  template literal x000D  var merge      good      know     x000D  result textContent      nOk    merge 0   to   merge 1     x000D   lt pre id  result  gt  lt  pre gt  x000D   x000D   x000D

User · Answer

Note  from 2015 onwards  just use backticks for templating https   stackoverflow com a 37245773 294884 let a    hello   name         NOTE           not   or  quot   Note that it is a backtick  not a quote   If you want to have something similar  you could create a function  function parse str        var args      slice call arguments  1           i   0       return str replace   s g       gt  args i         Usage  s   parse  hello  s  how are you doing   my name    This is only a simple example and does not take into account different kinds of data types  like  i  etc  or escaping of  s  But I hope it gives you some idea  I m pretty sure there are also libraries out there which provide a function like this

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Here is a Multi-line String Literal example in Node js    gt  let name    Fred   gt  tm    Dear   name       This is to inform you    name   that you are     IN VIOLATION of Penal Code 64 302-4      Surrender yourself IMMEDIATELY      THIS MEANS YOU    name                Dear Fred  nThis is to inform you  Fred  that you are nIN VIOLATION of Penal Code 64 302-4  nSurrender yourself IMMEDIATELY  nTHIS MEANS YOU  Fred    n n  console log tm  Dear Fred  This is to inform you  Fred  that you are IN VIOLATION of Penal Code 64 302-4  Surrender yourself IMMEDIATELY  THIS MEANS YOU  Fred      undefined  gt

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Do that  s    hello     my name      how are you doing   Update With ES6  you could also do this  s    hello   my name   how are you doing

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