JavaScript set object key by variable

Question

I am building some objects in JavaScript and pushing those objects into an array  I am storing the key I want to use in a variable then creating my objects like so   var key    happyCount   myArray push    key   someValueArray        but when I try to examine my array of objects for every object the key is  key  instead of the value of the variable key  Is there any way to set the value of the key from a variable    Fiddle for better explanation  http   jsfiddle net Fr6eY 3

User · Accepted Answer

You need to make the object first  then use    to set it   var key    happyCount   var obj       obj key    someValueArray  myArray push obj       UPDATE 2018   If you re able to use ES6 and Babel  you can use this new feature          yourKeyVariable   someValueArray

User · Answer

In ES6  you can do like this   var key    name   var person     key   John       same as var person     name     John   console log person      should print  Object   name  John      x000D   x000D      var key    name   x000D      var person     key   John    x000D      console log person      should print  Object   name  John   x000D   x000D   x000D    Its called Computed Property Names  its implemented using bracket notation  square brackets       Example     variableName    someValue       Starting with ECMAScript 2015  the object initializer syntax also   supports computed property names  That allows you to put an expression   in brackets     that will be computed and used as the property name    For ES5  try something like this   var yourObject        yourObject yourKey     yourValue    console log yourObject      example   var person       var key    name    person key     this is same as person name       John    console log person      should print  Object   name  John      x000D   x000D      var person       x000D      var key    name   x000D       x000D      person key     this is same as person name       John   x000D       x000D      console log person      should print  Object   name  John   x000D   x000D   x000D

[javascript] JavaScript set object key by variable

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