how to add values to an array of objects dynamically in javascript

Question

this is an array of objects   var data             label     1    value    12           label     1    value    12           label     1    value    12           label     1    value    12           how can i add values to these dynamically  i tried the below code but no success  var lab    1   2   3    4    var val    42 55 51 22   var data   new Array    for var i 0  i lt 4  i        data i  label   lab i      data i  value   val i           anyone please   thanks in advance

User · Answer

In Year 2019  we can use Javascript s ES6 Spread syntax to do it concisely and efficiently  data       data    label   2   value   13     Examples   x000D   x000D  var data     x000D          label     1    value    12   x000D          label     1    value    12   x000D          label     1    value    12   x000D         x000D       x000D  data       data    label     2    value    14    x000D  console log data  x000D   x000D   x000D    For your case  i know it was in 2011   we can do it with map    amp  forEach   like below   x000D   x000D  var lab     1   2   3   4    x000D  var val    42 55 51 22   x000D   x000D    Using forEach   x000D  var data       x000D  val forEach  v i    gt   x000D     data      data    label   lab i    value  v   x000D    x000D   x000D    Using map   x000D  var dataMap   val map  v i    gt   x000D      label   lab i    value  v   x000D    x000D   x000D  console log  data     data   x000D  console log  dataMap      dataMap   x000D   x000D   x000D

User · Answer

You have to instantiate the object first  The simplest way is   var lab    1   2   3    var val    42 55 51 22   var data       for var i 0  i lt 4  i           data push  label  lab i   value  val i         Or an other  less concise way  but closer to your original code   for var i 0  i lt 4  i          data i                        creates a new object    data i  label   lab i      data i  value   val i           array   will not create a new array  unless you defined that function   Either Array   or new Array   or just      I recommend to read the MDN JavaScript Guide

[javascript] how to add values to an array of objects dynamically in javascript?

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