Creating object with dynamic keys

Question

First off  I m using Cheerio for some DOM access and parsing with Node js  Good times   Heres the situation    I have a function that I need to create an object  That object uses variables for both its keys and values  and then return that single object  Example   stuff   function  thing  callback      var inputs       div quantity  gt  input   map function        var key     this attr  name           value   this attr  value          return   key   value            callback null  inputs       It outputs this        key   1       key   1          map   returns an array of objects fyi   I need key to actually be the string from this attr  name     Whats the best way to assign a string as a key in Javascript  considering what I m trying to do

User · Answer

You can t define an object literal with a dynamic key  Do this    var o       o key    value  return o    There s no shortcut  edit  there s one now  with ES6  see the other answer

User · Answer

In the new ES2015 standard for JavaScript  formerly called ES6   objects can be created with computed keys  Object Initializer spec   The syntax is   var obj        myKey   value      If applied to the OP s scenario  it would turn into   stuff   function  thing  callback      var inputs       div quantity  gt  input   map function        return          this attr  name     this attr  value                    callback null  inputs       Note  A transpiler is still required for browser compatiblity   Using Babel or Google s traceur  it is possible to use this syntax today     In earlier JavaScript specifications  ES5 and below   the key in an object literal is always interpreted literally  as a string   To use a  dynamic  key  you have to use bracket notation   var obj       obj myKey    value    In your case   stuff   function  thing  callback      var inputs       div quantity  gt  input   map function        var key     this attr  name           value   this attr  value           ret               ret key    value       return ret           callback null  inputs

[javascript] Creating object with dynamic keys

Examples related to javascript

Examples related to object