unique array in pure js

gistfile1.js

var a = [ {x:1}, {x:2}, {x:1}, {x:1}, {x:3} ];
console.log( unique( a ) ); // -> [ {x:1}, {x:2}, {x:3} ]


function unique ( array ) {

	var result = [];

	array.forEach( function ( el ) {
		
		var unique = !result.some( function ( el2 ) { return el.x === el2.x } );

		if ( unique ) {

			result.push( el );

		}

	} );

	return result;
 
}