Traverse JSON Object

gistfile1.js

var obj = {
	a:1,
	b: {
		c:2
	},
	d: [1,2,3,4]
};

function process(key,value) {
	  console.log(key,value)
}

function traverse(o,func) {
    for (var i in o) {
        func.apply(this,[i,o[i]]);  
        if (o[i] !== null && typeof(o[i])=="object") {
            traverse(o[i],func);
        }
    }
}

traverse(obj,process);