let arr = [1, 2, 3, 4, 5];

/* This will count from 0 to 5 by 1 seconds.
*/
arr.each((e, i, next) => {
console.log(e);
setTimeout(next, 1000);
});

/* This will pick random number from 0 to 5.
* There's a double chance of getting 3.
*/
let picked = arr.pick([1, 1, 2, 1, 1]);

/* This will trim the falsey of array elements.
* Same as String.prototype.trim()
*/
Array.prototype.trimStart();
Array.prototype.trimEnd();
Array.prototype.trim();

/* This will hallow clone the array.
*/
let arr1 = arr.clone();

function *gen() {
let i = 100;
while (i--) {
yield i;
}
}