Traverse through Javascript object properties

Question

I want to traverse through JavaScript object\'s property

    var obj =
    {
        a: \'value1\',
        b: \'value2\',
        c: \'value3\',
        d: \'va         


        

Answer 1

Here is how it is done using the ES5 - Object.keys() :

Object.keys(obj).forEach(function(key, idx) {
   ...
}); 

http://jsfiddle.net/magiccrafter/bvwenh5d/

Mozilla's docs: link

Answer 2

prop will reference the property name, not its value.

for (var prop in obj) {
    obj[prop] = 'xxx';
}

Construct documentation.

Also you may want to check if the property belongs to the object using hasOwnProperty. It may happen that someone adds properties to the prototype and those are also iterated by for ... in.