Programming Fundamentals: The Final Quest

function solve(params) {
  params.pop();
  let collection = params.shift().split(" ");

  for (let param of params) {
    let tokens = param.split(" ");
    let command = tokens[0];

    if (command === "Delete") {
      let index = Number(tokens[1]);
      if (index >= 0 && index < collection.length) {
        collection.splice(index + 1, 1);
      }
    } else if (command === "Swap") {
      let word1 = tokens[1];
      let word2 = tokens[2];
      for (let i = 0; i < collection.length; i++) {
        if (collection[i] === word1) {
          collection[i] = word2;
        } else if (collection[i] === word2) {
          collection[i] = word1;
        }
      }
    } else if (command === "Put") {
      let word = tokens[1];
      let index = Number(tokens[2]);
      if (index >= 0 && index < collection.length) {
        collection.splice(index - 1, 0, word);
      }
    } else if (command === "Sort") {
      collection.sort((a, b) => b - a);
    } else if (command === "Replace") {
      let word1 = tokens[1];
      let word2 = tokens[2];
      for (let i = 0; i < collection.length; i++) {
        if (collection[i] === word2) {
          collection[i] = word1;
        }
      }
    }
  }
  console.log(collection.join(" "));
}