freecodecamp_where.js

where.js

function where(collection, source) {
	return collection.filter(function (v) {
		for (var i in source) {
			if (!(v.hasOwnProperty(i) && (v[i] === source[i]))) {
				return false;
			}
		}

		return true;
	});
}


where([{ first: 'Romeo', last: 'Montague' }, { first: 'Mercutio', last: null }, { first: 'Tybalt', last: 'Capulet' }], { last: 'Capulet' });