ES6 map, filter

  test = () => {

    var data = [1, 2, 3, 4];

    var arrayOfSquares = data.map(function(item) {

      return item * item;

    });

    console.log(arrayOfSquares);

  };

test = () => {

    var data = [0, 1, 2, 3];

    var arrayFilter = data.filter(function(item) {

      return item>1;

    });

    console.log(arrayFilter);