function makeArmy() {
  let shooters = [];

  let i = 0;
  while (i < 10) {
    let shooter = function() { // shooter function
      alert( i ); // should show its number
    };
    shooters.push(shooter);
    i++;
  }

  return shooters;
}

/*
let army = makeArmy();

army[0](); // the shooter number 0 shows 10
army[5](); // and number 5 also outputs 10...
// ... all shooters show 10 instead of their 0, 1, 2, 3...
*/