Primitives in JavaScript - ECMAScript 2021

In JavaScript - ECMAScript 2021, there are six primitive types:
1. undefined
2. null
3. boolean
4. number
5. string
6. symbol

Here are some explanations and examples of each primitive type:

1. undefined: It represents a variable that has been declared but not assigned a value.

    let a; 
    console.log(a); // Output: undefined 
    

2. null: It represents an intentional absence of any object value.

    let a = null; 
    console.log(a); // Output: null 
    

3. boolean: It represents a logical entity that can have two values: true or false.

    let isTrue = true;
    let isFalse = false;
    console.log(isTrue); // Output: true
    console.log(isFalse); // Output: false
    

4. number: It represents numeric values.

    let num = 123; 
    console.log(num); // Output: 123
    

5. string: It represents a sequence of characters and allows for text manipulation.

    let str = "Hello, World!"; 
    console.log(str); // Output: Hello, World!
    

6. symbol: It represents a unique identifier that is immutable and can be used as an object property key.

    let symbolOne = Symbol("blue");
    let symbolTwo = Symbol("blue");
    console.log(symbolOne === symbolTwo); // Output: false