Old school filtering

filter-old-school.js

var array    = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
var newArray = [];

for (var i = 0; i < array.length; i++) {
    if (array[i] % 2 == 0) {
        newArray.push(array[i] * 2);
    }
}