var myString = "xyz";

function printPermut(inputString){
    var outputString;
    if(inputString.length === 0){
        return inputString;
    }
    if(inputString.length === 1){
        return inputString;
    }
    else{
       for(int i = 0; i<inputString.length(); i++){
           //something here like:
           //outputString = outputString.concat(printPermut(inputString.slice(1))??
           //maybe store each unique permutation to an array or something?
       }
    }
}

function permut(string) {
    if (string.length < 2) return string; // This is our break condition

    var permutations = []; // This array will hold our permutations

    for (var i=0; i<string.length; i++) {
        var char = string[i];

        // Cause we don't want any duplicates:
        if (string.indexOf(char) != i) // if char was used already
            continue;           // skip it this time

        var remainingString = string.slice(0,i) + string.slice(i+1,string.length); //Note: you can concat Strings via '+' in JS

        for (var subPermutation of permut(remainingString))
            permutations.push(char + subPermutation)

    }
    return permutations;
}

var myString = "xyz";
permutations = permut(myString);
for (permutation of permutations)
    print(permutation) //Use the output method of your choice