JAVASCRIPT

permutation and combination program in javascript

<script>
// Javascript program to print all permutations of a
// given string.
  
function permute(str, l, r)
{
    if (l == r)
            document.write(str+"<br>");
        else
        {
            for (let i = l; i <= r; i++)
            {
                str = swap(str, l, i);
                permute(str, l + 1, r);
                str = swap(str, l, i);
            }
        }
}
  
function swap(a, i, j)
{
    let temp;
let charArray = a.split("");
temp = charArray[i] ;
charArray[i] = charArray[j];
charArray[j] = temp;
return (charArray).join("");
}
  
let str = "ABC";
let n = str.length;
permute(str, 0, n-1);
  
// This code is contributed by avanitrachhadiya2155
</script>