JavaScript Iterators

const randomNumbers = [4, 11, 42, 14, 39]; const filteredArray = randomNumbers.filter(n => { return n > 5; }); 

const numbers = [28, 77, 45, 99, 27]; numbers.forEach(number => { console.log(number); }); 

const members = ["Taylor", "Donald", "Don", "Natasha", "Bobby"]; const announcements = members.map((member) => { return member + " joined the contest."; }); console.log(announcements); 

const numbers = [1, 2, 3, 4]; const sum = numbers.reduce((accumulator, curVal) => { return accumulator + curVal; }); console.log(sum); // 10 

const isEven = (n) => { return n % 2 == 0; } let printMsg = (evenFunc, num) => { const isNumEven = evenFunc(num); console.log(`${num} is an even number: ${isNumEven}.`) } // Pass in isEven as the callback function printMsg(isEven, 4); // => The number 4 is an even number: True. 

let plusFive = (number) => { return number + 5; }; // f is assigned the value of plusFive let f = plusFive; plusFive(3); // 8 // Since f has a function value, it can be invoked. f(9); // 14