All permutations for sting

A.Permutations for string.md

Permutations for string

index.ts

function permutations(string) {
  if (!string || typeof string !== "string"){
      return "Please enter a string"
  }

  if (!!string.length && string.length < 2 ){
      console.log('letter', string);
      return [string]
  }

  let permutationsArr = [];
  
  for (let i = 0; i < string.length; i++){
      let char = string[i]
      console.log('char', char, i);

      // if (string.indexOf(char) !== i) {
      //     continue;
      // }

      let remainder = string.slice(0, i) + string.slice(i + 1, string.length);
      console.log('remainder', remainder);

      for (let permutation of permutations(remainder)){
          console.log(char, permutation);
          permutationsArr.push(char + permutation);
          console.log('returned', permutationsArr);
      }
  }
  return permutationsArr;
}

// permutations('a');
// permutations('ab');
permutations('abs');