JavaScript Array

• filter()
  Src
  The filter() method creates a new array with all elements that pass the test implemented by the provided function.

• from()
  MDN
  Src

let arr = Array.from(range, num => num * num); 
alert(arr); // 1,4,9,16,25
 
console.log(Array.from('foo'));
// expected output: Array ["f", "o", "o"]
 
console.log(Array.from([1, 2, 3], x => x + x));
// expected output: Array [2, 4, 6]

• map()
  Apply function to every element, and return a new array for this.

• forEach()
  Apply function to every element, but do not return a new array.