JavaScript filter

var customArray = [3, 5, 7];

var moreThan4 = customArray.filter(function(item) {

    if (item > 4) {

        return true;

    }

});

console.log(moreThan4); // 5, 7

Alternative syntax with arrow function:

var customArray = [3, 5, 7];

var moreThan4 = customArray.filter(item => item > 4);

console.log(moreThan4); // 5, 7