Getting index of an array's element based on its properties

I have a JavaScript array of objects like this:

var myArray = [{...}, {...}, {...}];

Each object has unique id among other properties:

{ 
  id: 4,
  property1: 'something',
  property2: 'something'
}

How can I get an index of a particular object in that array, if I only know its id property? So if I know that myArray[x].id == 4, how can I find x?

var index = myArray.map(function(el) {
  return el.id;
}).indexOf(4);

For IE below version 9, map need a patch, or just use a loop.

Or with ES6 syntax:

let index = myArray.map( el => el.id ).indexOf(4)

or

let index = myArray.findIndex( el => el.id === 4 )

Why not simply make a loop ?

function indexOfId(array, id) {
    for (var i=0; i<array.length; i++) {
       if (array[i].id==id) return i;
    }
    return -1;
}

The fact that there are many facilities in js (or js libraries) doesn't mean you must not, sometimes, write a loop. That's fast and simple.

ES6 Array.findIndex

const myArray = [{id:1}, {id:2}, {id3}];
const foundIndex = myArray.findIndex((el) => (el.id === 3));