Rock Paper Scissors JavaScript Permutation Solution (pre-ES6)

rockPaperScissors.js

var rockPaperScissors = function (n) {
  // Capture the n or give it a default value of 3
  n = n || 3;
  // Store the possible moves
  const moves = ['R', 'P', 'S'];
  // Store the possible game outcomes
  const possibilities = [];
  // Iterate on the number of options by the power of number of rounds
  for (let i = 0; i < moves.length ** n; i++) {
    // Store the current game outcome of all rounds
    let game = '';
    // Decide the indexes of each round 'base'd on the number of options
    let indexOnBase = i.toString(moves.length);
    // Add a '0' index for the indexes that we have not reached yet
    while (indexOnBase.length < n) {
      indexOnBase = '0' + indexOnBase;
    }
    // Iterate each round
    for (let j = 0; j < n; j++) {
      // Add the current round to the game based on its decided index
      game += moves[indexOnBase[j]];
    }
    // Add the current game outcome to the outcomes list
    possibilities.push(game);
  }
  // Return the possible outcomes
  return possibilities;
};