forlooplet.js

var result = [];
 
for (let i = 0; i < 5; i++) {
  result[i] = function () {
    console.log(i);
  };
}

result[0](); // 0, expected 0
result[1](); // 1, expected 1
result[2](); // 2, expected 2
result[3](); // 3, expected 3
result[4](); // 4, expected 4