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

Question

I have a JavaScript array of objects like this:

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

Each object has unique id among other pro

Answer 1

Or with ES6 syntax:

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

or

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