intersect.js

var arr1 = [ { name: 'Nikki' }, { name: 'Jason' }, { name: 'Thanh' } ];
var arr2 = [ { name: 'Nikki' }, { name: 'Thanh' } ];

var index = {};

arr1.forEach(function(item) {
    index[item.name] = item;
});

console.log(index);

var intersection = [];

arr2.forEach(function(item) {
    if (item.name in index) {
        intersection.push(item);
    }
});

console.log(intersection);