How do you combine two objects in Javascript?
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How can I merge properties of two JavaScript objects dynamically?
If I have two Javascript objects which I am using as a list of key-value pairs:
var a = {a:1};
var b = {b:2};
what is the most efficient way to combine them into a third object which contains the properties of both?
var c = {a:1, b:2};
I don't mind if either or both of a and b are modified in the process.
You can do simply this :
var c = {};
for (var key in a) {
c[key] = a[key];
}
for (var key in b) {
c[key] = b[key];
}
If you want to do a deep merging (assuming you don't want to copy the functions and prototypes), you can use this :
function goclone(source) {
if (Object.prototype.toString.call(source)==='[object Array]') {
var clone = [];
for (var i=0; i<source.length; i++) {
if (source[i]) clone[i] = goclone(source[i]);
}
return clone;
} else if (typeof(source)=="object") {
var clone = {};
for (var prop in source) {
if (source[prop]) {
var firstChar = prop.charAt(0);
clone[prop] = goclone(source[prop]);
}
}
return clone;
} else {
return source;
}
}
var c = {};
for (var key in a) {
c[key] = goclone(a[key]);
}
for (var key in b) {
c[key] = goclone(b[key]);
}
But frankly I never saw the use for a deep merging in javascript...
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