Convert flat array [k1,v1,k2,v2] to object {k1:v1,k2:v2} in JavaScript?

Question

Is there a simple way in javascript to take a flat array and convert into an object with the even-indexed members of the array as properties and odd-indexed members as corre

Answer 1

var arr = [ 'a', 'b', 'c', 'd', 'e', 'f' ];
var obj = arr.reduce( function( ret, value, i, values ) {

    if( i % 2 === 0 ) ret[ value ] = values[ i + 1 ];
    return ret;

}, { } );

Answer 2

Pretty sure this will work and is shorter:

var arr = [ 'a', 'b', 'c', 'd', 'e', 'f' ];
var obj = {};
while (arr.length) {
    obj[arr.shift()] = arr.shift();
}

See shift().

Answer 3

If you need it multiple times you can also add a method to the Array.prototype:

Array.prototype.to_object = function () {
  var obj = {};
  for(var i = 0; i < this.length; i += 2) {
    obj[this[i]] = this[i + 1]; 
  }
  return obj
};

var a = [ 'a', 'b', 'c', 'd', 'e', 'f' ];

a.to_object();    // => { 'a': 'b', 'c': 'd', 'e': 'f' }