Remove duplicate characters from string

Question

I have to make a function in JavaScript that removes all duplicated letters in a string. So far I\'ve been able to do this: If I have the word \"anaconda\" it shows me as a

Answer 1

DEMO

function find_unique_characters( string ){
    unique=[];
    while(string.length>0){
        var char = string.charAt(0);
        var re = new RegExp(char,"g");
        if (string.match(re).length===1) unique.push(char);
        string=string.replace(re,"");
    }        
    return unique.join("");
}
console.log(find_unique_characters('baraban')); // rn
console.log(find_unique_characters('anaconda')); //cod
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