Creating permutations of a string

perms.js

function perm(str) {
    const results = [];
    if (str.length === 1) return str;
    
    for (let i = 0; i < str.length; i++) {
        const currentChar = str[i];
        const remainingChars = str.slice(0, i) + str.slice(i+1);
        const innerPermutations = perm(remainingChars);
        for (let j = 0; j < innerPermutations.length; j++) {
            results.push(currentChar + innerPermutations[j]);
        }
        
    }
    return results;

}