Deduplicate an Array

dedup.js

function dedup(arr) {
	var hashTable = {};
	return arr.filter(function (el) {
	    var key;
	    if (Object.prototype.toString.call(el) === "[object Object]") {
	      key = JSON.stringify(Object.keys(el).sort());
          Object.keys(el).forEach(function(i){
            key += JSON.stringify(el[i]);
          });
        } else {
	      key = JSON.stringify(el);
	    }
	    var match = Boolean(hashTable[key]);
	    return (match ? false : hashTable[key] = true);
	});
}

var asd  = [1, '1', 1, [1,2], [2,1], [1,2], {a:1, b:2}, {a:2, b:1}, {b:1, a:2}];

console.log(dedup(asd));