update

Author: last-endcode

Functions/01_IFFE.js

@@ -0,0 +1,30 @@
+// Global variable
+const a = 20;
+const b = 20;
+
+// normally function
+function add() {
+  console.log(`The result is : ${a + b}`); //40
+}
+add();
+
+// Disini variable dia terproteksi
+// like local
+(function () {
+  const a = 40;
+  const b = 40;
+  console.log(`The result is : ${a + b}`); //80
+})();
+
+// use parameter
+(function (num1, num2) {
+  console.log(`The result is : ${num1 * num2}`); //80
+})(500, 5000000); // 2500000000
+
+// expression function
+const result = (function (num1, num2) {
+  console.log(`The result is : ${num1 * num2}`); //80
+  return num1 * num2;
+})(500, 5000000);
+
+console.log(result); //2500000000 cause your saving return if not will undefined

Functions/02_hoisting.js

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+// Hoisting
+// function and var declaration are hoisted
+// safer to acces only after initialized
+
+// this invoke mau disimpan dimana pun tetap terpanggil
+// karena js membaca stiap baris code
+
+person();
+// console.log(person);
+
+// var dia akan undefined
+// tapi tdk menghsilkan error
+// but kalo disimpan stlah functionnya dia
+// akan menghasilkan random
+personVar();
+
+// jika simpan diatas sebelum function akan error
+// karena function dgn inisialiasi hnya bisa membaca
+// ketika hanya sesudah di inisialiasi
+// artinya lebih aman digunakan hanya sesudah di inisialiasi
+theName(); // error
+
+let firstName = 'zoro';
+const friendName = 'lutfy';
+var random = 'random';
+
+// theName();  //bisa krna sesudah inisialisasi
+
+function person() {
+  console.log(`Hello World`);
+}
+
+function personVar() {
+  console.log(`${random}`);
+}
+
+function theName() {
+  console.log(`${firstName} & ${friendName}`);
+}
+
+// theName();  //bisa krna sesudah inisialisasi

Functions/03_closures.js

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+// clousures
+// gives you an access to an outer functions scope
+// from an innner function
+// make private variables with closures
+
+function shpName(firstName, lastName) {
+  let member = 'SHP';
+  function addName(balance) {
+    console.log(
+      `Hello member ${member} : ${firstName} ${lastName} with ${
+        balance * 10000000
+      }`
+    );
+  }
+  return addName;
+}
+
+// invoke, and use this () for calling inner function
+shpName('mugiwara', 'no lutfy')(100000000);
+
+// create 2 instance obj
+const zoro = new shpName('rorona', 'zoro');
+const sanji = new shpName('sanji', 'vinsmoke');
+zoro(4000000);
+sanji(500000);