angular.forEach

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.1/angular.min.js"></script>

JavaScript

var obj = {
    alphaId : 100,
    beta  : "it's the end of the world as we know it.",
    gamma : "Since my baby left me"
    ,delta: 100
};
var context = {};

function handler(value, key, obj) {
    //console.log(key, value);
}
angular.forEach(obj, handler, context);

var schema = {
alpha:null
,beta:null
,gamma:null
}
var e = obj;
var item = {};

angular.forEach(schema, function (value, att) {
	item[att] = e[att];
});

console.log(item);