How to get unique values in an array

Question

How can I get a list of unique values in an array? Do I always have to use a second array or is there something similar to java\'s hashmap in JavaScript?

I am going

Answer 1

I was just thinking if we can use linear search to eliminate the duplicates:

JavaScript:
function getUniqueRadios() {

var x=document.getElementById("QnA");
var ansArray = new Array();
var prev;


for (var i=0;i

}

HTML:

 good 
 avg 

 Type1 
 Type2