For instance, from these two objects :
var object1 = {
"color": "yellow",
"size" : null,
"age" : 7,
"weight" : null
}
var object2 = {
"color": "blue",
"size" : 51,
"age" : null
}
I want this (object 2 overrides object 1 except for null properties or properties he doesn't have) :
{
"color": "blue",
"size" : 51,
"age" : 7,
"weight" : null
}
angular.extend(object1, object2) works but overrides age property to null
You can remove the null properties in object 2 before calling the extend.
var myApp = angular.module('myApp',[]);
var object1 = {
"color": "yellow",
"size" : null,
"age" : 7,
"weight" : null
}
var inside = {
"name": "me",
"age" : 9,
"nothing": null
}
var object2 = {
"color": "blue",
"size" : 51,
"age" : null,
"inside" : inside
}
function removeNullIn(prop, obj)
{
var pr = obj[prop];
if(pr === null || pr === undefined) delete obj[prop];
else if(typeof pr === 'object') for (var i in pr) removeNullIn(i, pr);
}
function removeNull(obj)
{
for (var i in obj) {
removeNullIn(i, obj);
}
}
removeNull(object2);
var mergedObject = angular.extend(object1, object2);
console.log(mergedObject);<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.9/angular.min.js"></script>
You can use this function as custom extend mechanism instead of native angular.extend.
/**
* Extends dst with props from src
* @see
* customExtend({a: 1, test : 1}, {b: 1, test : 2});
* //this will return {a: 1, b: 1, test: 2}
* @returns {Object}
*/
var customExtend = function (/* [emptyObject], dst, src */) {
var $$args = Array.prototype.slice.call(arguments, 0);
if ($$args.length === 3) {
$$args.shift();
}
for (var i in $$args[1]) {
if ($$args[1][i] !== null || angular.isUndefined($$args[1][i])) {
$$args[0][i] = $$args[1][i];
}
}
return $$args[0];
};
angular.customExtend = customExtend;
