Creating objects from array to json object

Question

I have an array of object like this

[
 {"id": "1", "name": "test"},
 {"id": "2", "name": "test2"},
 {"id": "3", "name": "test3"}
]

I want to convert it to object list this

{
 "1": {"name": "test"},
 "2": {"name": "test2"},
 "3": {"name": "test3"},
}

• T.J. Crowder: "Creating objects from array to json object" sigh It's not a "json object." It's just an object. JSON is a textual notation for data interchange.
• A. Wolff: Why in first place didn't you generate an object instead of an array of objects? Maybe this array comes from any third party script but i have to ask it.

Answer 1

You may use reduce :

var obj = arr.reduce(function(m,o){ m[o.id]={name:o.name}; return m }, {});

Side note : please be sure to read and try to understand T.J.'s comment about JSON

• T.J. Crowder: @ OP - Note that Array#reduce requires a modern browser or a shim; if you need to support older browsers like IE8, search for "es5 shim" for options.
• Denys Séguret: @T.J.Crowder You're right but isn't it time we stop telling that ? After all even gmail stopped supporting IE9 long ago (this is a question, not a critic of the comment).
• T.J. Crowder: @ dystroy: My take is that when 6% to 21% of people globally are still using a browser (IE8), it's still relevant and important. Despite the XP deadline having passed, I suspect we're stuck with IE8 a while longer. I can't afford for even 6% of my users to have my site fail with a random script error. And the note is easy to add. Now of course, the only stats that really matter are the stats for one's own site...