Word permutations

word permutations.js

const originalWords = "makes my dick hard";
const wordArray = originalWords.split(" ");

function perm(xs) {
    let ret = [];
    for (let i = 0; i < xs.length; i = i + 1) {
        let rest = perm(xs.slice(0, i).concat(xs.slice(i + 1)));
        if (!rest.length) {
            ret.push([xs[i]])
        } else {
            for (let j = 0; j < rest.length; j = j + 1) {
                ret.push([xs[i]].concat(rest[j]))
            }
        }
    }
    return ret;
}
const permutations = perm(wordArray);
const mergedPermutations = permutations.map(item=> item.join(" "));
console.log("permutations: ");
console.log(mergedPermutations);