Convert array to array-like object

Question

I have an array, say [{ id: 'first' }, { id: 'second' }]

Are there any native methods I'm missing that will convert the array into an array-like object? I've seen plenty of answers asking about the other direction, and recommending Array.prototype.slice.call (or the newer Array.from), but I can't find anyone asking about this. For the above example, I'd want to get the following output:

{
  0: { id: 'first' }
  1: { id: 'second' }
}

`New Set(array)` <- that would create an array-like object, a Set — adeneo, Oct 14 '16 at 15:27
@user2415266 maybe you could help him out since it seems he's new to programming — Jay, Oct 14 '16 at 15:36
@Wade maybe he could search before asking a duplicate question — Danmoreng, Oct 14 '16 at 15:36
@user2415266 maybe you should read the [ideologies stack overflow is trying to represent](http://stackoverflow.com/help/be-nice) before being so rude to new contributors and programmers — Jay, Oct 14 '16 at 15:45

score 4 · Answer 1 · edited Oct 14 '16 at 17:17

4

Reducing it

var array = [{ id: 'first' }, { id: 'second' }];
var obj   = array.reduce( (a,b,i) =>  {return a[i]=b,a},{})

console.log(obj)

Check out the documentation on Array.reduce on MDN (Mozilla Developer Network)

edited Oct 14 '16 at 17:17

Jay

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answered Oct 14 '16 at 15:30

adeneo

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score 1 · Answer 2 · answered Oct 14 '16 at 15:30

1

You could just iterate through the array and add the values to the respective index

var arr = [{ id: 'first' }, { id: 'second' }];
var set = {};
arr.forEach(function(value, index){
    set[index] = value; 
})

console.log(set)

answered Oct 14 '16 at 15:30

taguenizy

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Nice solution! You should check out @adeneo 's answer using `Array.reduce`, it does the same thing but using javascript's built in methods – Jay Oct 14 '16 at 15:38

score 0 · Answer 3 · answered Oct 14 '16 at 15:29

Not a native method, but the following helper function should do the trick:

var arr = [{ id: 'first' }, { id: 'second' }];

function toArrayLike(arrayToConvert) {
    var retVal = {};
    Object.keys(arrayToConvert).forEach(function(key) {
        retVal[key] = arrayToConvert[key];
    });
    return retVal
}

var arrayLike = toArrayLike(arr);
console.log(arrayLike);

Convert array to array-like object

3 Answers3