What is the best way to convert:
['a','b','c']
to:
{
0: 'a',
1: 'b',
2: 'c'
}
ECMAScript 6 introduces the easily polyfillable Object.assign:
The
Object.assign()method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.
Object.assign({}, ['a','b','c']); // {0:"a", 1:"b", 2:"c"}
The own length property of the array is not copied because it isn't enumerable.
Also, you can use ES6 spread syntax to achieve the same result:
{ ...['a', 'b', 'c'] }
With a function like this:
function toObject(arr) {
var rv = {};
for (var i = 0; i < arr.length; ++i)
rv[i] = arr[i];
return rv;
}
Your array already is more-or-less just an object, but arrays do have some "interesting" and special behavior with respect to integer-named properties. The above will give you a plain object.
edit oh also you might want to account for "holes" in the array:
function toObject(arr) {
var rv = {};
for (var i = 0; i < arr.length; ++i)
if (arr[i] !== undefined) rv[i] = arr[i];
return rv;
}
In modern JavaScript runtimes, you can use the .reduce() method:
var obj = arr.reduce(function(acc, cur, i) {
acc[i] = cur;
return acc;
}, {});
That one also avoids "holes" in the array, because that's how .reduce() works.