Steam

'use strict';

function tseamAccount(arr) {

  let i = 1;
  let command = arr[i].split(' ')[0];

  //Convert gaming account into an array;
  let gamingAccountArray = arr[0].split(' ');

  while (command != 'Play!') {
    let currentGame = arr[i].split(' ')[1]

    if (command == 'Install') {
      //If the game is not installed, add it to the account;
      if ( !(gamingAccountArray.includes(currentGame)) ) gamingAccountArray.push(currentGame);
    }

    if (command == 'Uninstall') {
      //If the game is installed, remove it from the account;
      if (gamingAccountArray.includes(currentGame)) {
        removeSingleItem(gamingAccountArray, currentGame);
      }
    }

    if (command == 'Update') {
      //If the game is installed, move it from its' place to the last;
      if (gamingAccountArray.includes(currentGame)) {
        removeSingleItem(gamingAccountArray, currentGame);
        gamingAccountArray.push(currentGame);
      }
    }

    if (command == 'Expansion') {
      //Separate game name from expansion name;
      let game = currentGame.split('-')[0];
      let expansion = currentGame.split('-')[1];
      if (gamingAccountArray.includes(game)) {
        //Modify game name;
        let newGameName = game + ':' + expansion;
        //Insert expansion;
        swapItems(gamingAccountArray, game, newGameName);
      }
    }

    i++;
    //Get current game and a command;
    command = arr[i].split(' ')[0];
  }

  console.log( gamingAccountArray.join(' ') );

  //Declarations
  function removeSingleItem(arr, value) {
    let index = arr.indexOf(value);

    if (index > -1) {
      arr.splice(index, 1);
    }
    return arr;
  }

  function swapItems(arr, swappedItem, newItem) {
    let index = arr.indexOf(swappedItem);

    if (index > -1) {
      arr.splice(index, 1, newItem);
    }
    return arr;
  }
}

tseamAccount([
  'CS WoW Diablo',
  'Install LoL',
  'Uninstall WoW',
  'Update Diablo',
  'Expansion CS-Go',
  'Play!'
]);