JavaScript Primitives

JavaScript variable can hold

Examples

// Number let length = 16;
let weight = 7.5;
// BigInt let x = 1234567890123456789012345n;
let y = BigInt(1234567890123456789012345)
// Strings let color = "Yellow";
let lastName = "Johnson";
// Boolean let x = true;
let y = false;
// Undefined let x;
let y;
// Null let x = null;
let y = null;
// Symbol const x = Symbol();
const y = Symbol();

JavaScript Strings

Example

let carName1 = "Volvo XC60";

let carName2 = 'Volvo XC60';

Example

let answer1 = "It's alright";

let answer2 = "He is called 'Johnny'";

let answer3 = 'He is called "Johnny"';

Learn More:

JavaScript String Methods

JavaScript String Search

JavaScript String Reference

JavaScript Numbers

Example

let x1 = 34.00;

let x2 = 34;

Exponential Notation

Example

let y = 123e5;    // 12300000 let z = 123e-5;   // 0.00123

Number Types

Whole numbers (integers):

(8 - bit), short
(16 - bit), int
(32 - bit), long
(64 - bit)

Real numbers (floating-point):

(32 - bit), double
(64 - bit).
Javascript numbers are always double (64 - bit floating point).

Learn More:

JavaScript Numbers Tutorial

JavaScript Number Methods

JavaScript Number Properties

JavaScript Number Reference

JavaScript BigInt

All JavaScript numbers are stored in a 64 - bit floating - point format.

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