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

Here's what I used - haven't tested it for spaces or special characters, but should work fine for pure strings:

function uniquereduce(instring){ 
    outstring = ''
    instringarray = instring.split('')
    used = {}
    for (var i = 0; i < instringarray.length; i++) {
        if(!used[instringarray[i]]){
            used[instringarray[i]] = true
            outstring += instringarray[i]
        }
    }
    return outstring
}