Javascript - Tipe Data

// String
let nama = "Budi";
let alamat = 'Jakarta';
let sambutan = `Halo, ${nama}!`;  // Template literal

// Number
let umur = 25;
let harga = 99.99;
let hex = 0xFF;  // 255 dalam desimal

// Boolean
let sudahLogin = true;
let isAdmin = false;

// Null & Undefined
let alamat = null;      // Nilai kosong yang disengaja
let noTelp;             // undefined
let umur = undefined;   // Tidak disarankan

// Object
let user = {
  nama: "Budi",
  umur: 25,
  aktif: true
};

// Array
let angka = [1, 2, 3, 4, 5];
let warna = ["merah", "hijau", "biru"];

// Function
function sapa(nama) {
  return `Halo, ${nama}!`;
}

let x = "5" + 2;      // "52" (string)
let y = "5" - 2;      // 3 (number)
let z = "5" * "2";    // 10 (number)
let a = "5" * "halo"; // NaN (Not a Number)

typeof "Budi"       // "string"
typeof 25           // "number"
typeof true         // "boolean"
typeof undefined    // "undefined"
typeof null         // "object" (ini adalah bug dalam JavaScript)
typeof [1,2,3]      // "object"
typeof {nama: "Budi"} // "object"
typeof function(){}  // "function"

// Cara lebih baik untuk mengecek array
Array.isArray([1,2,3])  // true