get all combinations for a string

Question

I\'m trying to create a function in JavaScript that given a string will return an array of all possible combinations of the letters with each used at most once, starting wit

Answer 1

function combinations(var1) {

    var temp;

    for (var i = 0; i < var1.length; i++) {
        var2 = "";

        temp = i;

        while (temp < var1.length) {

            var2 = var2.concat(var1.charAt(temp));
            // console.log(var2)
            if (i == var1.length - 1)
                document.getElementById('result').innerHTML += var2;

            else
                document.getElementById('result').innerHTML += var2 + ',';
            temp++;
        }
    }
}