Add new value to an existing array in JavaScript

Question

In PHP  I d do something like    array   array     array      value1    array      value2    array      value3     How would I do the same thing in JavaScript

User · Answer

This has nothing to do with jQuery  just JavaScript in general   To create an array in JavaScript   var a         Or   var a     value1    value2    value3      To append values on the end of existing array   a push  value4      To create a new array  you should really use    instead of new Array   for the following reasons    new Array 1  2  is equivalent to  1  2   but new Array 1  is not equivalent to  1   Rather the latter is closer to  undefined   since a single integer argument to the Array constructor indicates the desired array length  Array  just like any other built-in JavaScript class  is not a keyword  Therefore  someone could easily define Array in your code to do something other than construct an array

User · Answer

You can use the  push   method  which is standard JavaScript   e g   var primates   new Array    primates push  monkey    primates push  chimp

User · Answer

You don t need jQuery for that  Use regular javascript  var arr   new Array       or var arr       arr push  value1    arr push  value2      Note  In javascript  you can also use Objects as Arrays  but still have access to the Array prototypes  This makes the object behave like an array   var obj   new Object    Array prototype push call obj   value      will create an object that looks like         0   value       length  1     You can access the vaules just like a normal array f ex obj 0

User · Answer

jQuery is an abstraction of JavaScript  Think of jQuery as a sub-set of JavaScript  aimed at working with the DOM  That being said  there are functions for adding item s  to a collection  I would use basic JavaScript in your case though   var array   array 0     value1   array 1     value2   array 2     value3         Or   var array     value1    value2    value3          Or   var array        array push  value1    array push  value2    array push  value3

User · Answer

There are several ways   Instantiating the array   var arr   arr   new Array       empty array     ---  arr                   empty array     ---  arr   new Array 3   alert arr length       3 alert arr 0       undefined     ---  arr    3   alert arr length       1 alert arr 0       3   Pushing to the array   arr    3          arr     3  arr 1    4        arr     3  4  arr 2    5        arr     3  4  5  arr 4    7        arr     3  4  5  undefined  7      ---  arr    3   arr push 4             arr     3  4  arr push 5             arr     3  4  5  arr push 6  7  8       arr     3  4  5  6  7  8    Using  push   is the better way to add to an array  since you don t need to know how many items are already there  and you can add many items in one function call

User · Answer

Indeed  you must initialize your array then right after that use array push   command line   var array   new Array    array push  first value    array push  second value

User · Answer

Array is a JavaScript native object  why don t you just try to use the API of it  Knowing API on its own will save you time when you will switch to pure JavaScript or another framework    There are number of different possibilities  so  use the one which mostly targets your needs   Creating array with values   var array     value1    value2    value3      Adding values to the end  var array       array push  value1    array push  value2    array push  value3      Adding values to the begin   var array       array unshift  value1    array unshift  value2    array unshift  value3      Adding values at some index   var array       array index     value1     or by using splice  array splice index  0   value1    value2    value3      Choose one you need

User · Answer

array     value1    value2    value3     it s not so much jquery as javascript

[javascript] Add new value to an existing array in JavaScript

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