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