JS implements the array array output algorithm

The example of this article describes the array array output algorithm implemented by JS. Share with you for your reference. The specific analysis is as follows:

This js code performs the full array output, improving some of the old code
If you take any m (m≤n) elements from the n different elements, and arrange them in a definite order of 1, it is called to take one arrangement of m elements from the n different elements. All permutations are called full permutations when m=n.

function permute(input) {
  var permArr = [],
  usedChars = [];
  function main(input){
    var i, ch;
    for (i = 0; i < input.length; i++) {
      ch = input.splice(i, 1)[0];
      usedChars.push(ch);
      if (input.length == 0) {
        permArr.push(usedChars.slice());
      }
      main(input);
      input.splice(i, 0, ch);
      usedChars.pop();
    }
    return permArr
  }
  return main(input);
};
console.log(permute([5, 3, 7, 1]));

I hope this article is helpful to you in javascript programming.