The 7 primitive data types

The 7 Primitive Data types

• To check the Data type of any Varible / Value

console.log(typeof 'ChandraPrakash');

• Way of Declaring Variables

var a; // variable
var a = 1,
    b = 2,
    c = a + b; // one line
const PI = 3.14; // constant
let z = 'zzz'; // block scope local variable

('use strict'); // Use strict mode to write secure code
x = 1; // Throws an error because variable is not declared
// Creates property on global scope. [Not reccomend to wright Variable without Declaring]

1. Number: Floating point numbers -> Used for decimal and integers.

let age = 23;
console.log(typeof age);

2. String: Sequence of characters -> Used for text.

let firstName = 'ChandraPrakash';
console.log(typeof firstname);

3. Boolean: Logical type that can only be true or false -> Used for taking decisiions.

let fullAge = true;
console.log(typeof fullAge);

4. Undefined Value by a variables is not yet defind(“empty value”).

let children;
console.log(typeof children);

5. Null: Also means ‘empty value’.

let myNull = null;
console.log(typeof myNull);

6. Symbol (ES2015): Value that is unquie and cannot be changed [Not useful for now].

7. Biglnt (ES2020): Larger integers than the Number type can hold.