Datatype

“use strict”; Defines that JavaScript code should be executed in “strict mode”. more mode details

There are Two type of data

  1. Primitive data type
  2. Reference or Non-primitive data type

Primitive Data Type

Primitive data types are basic data types that are built into a programming language. They are the fundamental building blocks of coding.

There are 7 primitive date types

Shortcut Meaning
🟢 N Number
⚪ N Null
🔵 B Boolean
🟡 B BigInt
🔴 S String
🟣 S Symbol
⚫ U Undefined

For some Example:

const score = 100; // Number
const scoreValue = 100.3; // Decimal Number

const outsideTemp = null; // Null
const forEmptyValue = null; // Null

const isUserLog = true; // Boolean
const isPMisaCook = false; // Boolean

const longInt = 12345678910111213; // BigInt
const numberAfterN = 12345678910111213n; // BigInt


const yourName = "Karan Swarnakar";// String
const youeEmail = "demo@gmail.com";// String

const sym1 = Symbol(); // Symbol - Empty
const sym2 = Symbol("foo"); // Symbol
const sym3 = Symbol("foo"); // Symbol

const userAge; // Undefined
const userPurches; // Undefined

Non-Primitive/Rererence Data Type

Non-primitive data types, also known as reference types, include objects, arrays, and functions. These types hold references to memory locations rather than the actual data values.

There are Two type of data

Array, object, function are the non-primitive data type mode details

For some Example:

// Array
const heros = ["Batman", "Supperman", "Flash"];
// Object
let myObj = {
  name: "Karan Swarnakar",
  age: 20,
};
// Function
const myFunction = function () {
  console.log("Hello I am a Function");
};