forEach-map.js

const student = [
  { id: 11, name: "Smith" },
  { id: 12, name: "Roger" },
  { id: 13, name: "Romeo" },
  { id: 14, name: "Jesicca" },
  { id: 15, name: "Ellen" }
];

// // what we need ['smith', 'Roger', 'Romeo', 'Jesicca','Ellen']

// // using foreach
// need to create array variable
var studentName = [];

student.forEach((item) => {
  studentName.push(item.name);
});
console.log("pake forEach = ", studentName);

// if using Map
const studentNameMap = student.map((item) => item.name);

console.log("pake map = ", studentNameMap);

// implementasi lainnya 
const b = [];
b.forEach((item) => console.log(item)) // return undefined

b.map((item) => console.log(item)) // return [undefined, undefined, undefined, undefined]

const a = [1, 2, 3, 4]
a.forEach((item) => item + 1) // undefined
a.map((item) => item + 1) // return [2, 3, 4, 5]