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

i have javascript array of objects this:

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

each object has unique id among other properties:

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

how can index of particular object in array, if know id property? if know myarray[x].id == 4, how can find x?

var index = myarray.map(function(el) {   return el.id; }).indexof(4); 

for ie below version 9, map need patch, or use loop.