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rated 0 times [  76] [ 7]  / answers: 1 / hits: 35552  / 12 Years ago, thu, august 30, 2012, 12:00:00

Given two arrays, one with keys, one with values:



keys = ['foo', 'bar', 'qux']

values = ['1', '2', '3']


How would you convert it to an object, by only using underscore.js methods?



{

   foo: '1', 

   bar: '2',

   qux: '3'

}


I'm not looking for a plain javascript answer (like this).



I'm asking this as a personal exercise. I thought underscore had a method that was doing exactly this, only to find out it doesn't, and that got me wondering if it could be done.
I have an answer, but it involves quite a few operations. How would you do it?


More From » underscore.js
 Answers
11

What you need to use is the _.object method of underscore js.
If object method is not present in your version of underscore.js then you will have to manually add this method to it.





keys = ['foo', 'bar', 'qux']

values = ['1', '2', '3']

_.object = function(list, values) {

  if (list == null) return {};

  var result = {};

  for (var i = 0, l = list.length; i < l; i++) {

    if (values) {

      result[list[i]] = values[i];

    } else {

      result[list[i][0]] = list[i][1];

    }

  }

  return result;

};



console.log(_.object(keys, values))

<script src=https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js></script>




[#83333] Wednesday, August 29, 2012, 12 Years  [reply] [flag answer]
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