How can I merge 2 javascript objects, populating the properties in one if they don't exist in the other?

Question

If I have a javascript object/assoc. array defined like this:

function somefunction(options) {

    var defaults = {
        prop1: \'foo\',
        prop2: \'bar         


        

Answer 1

After re-reading the question, I realized you're probably looking for something more like this:

var a = { 'foo': 'bar', 'baz': 'bat' };
var b = { 'foo': 'quux' };
for (var prop in a) {
    if (prop in b) { continue; }
    b[prop] = a[prop];
}