Rest and Spread Syntax (...args) - Practicise

Introduction to JavaScript

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What is JavaScript?

Key Features of JavaScript

A Brief History of JavaScript

JavaScript in the Browser vs. Server (Node.js)

Setting Up JavaScript Environment

Why Learn JavaScript?

How to Add JavaScript?

0/3

Inline JavaScript

Internal JavaScript

External JavaScript

Different Ways to Output Data

0/4

Using innerHTML

Using document.write()

Using window.alert()

Using console.log()

Variables and Constants

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var, let, const

Scope of Variables

Data Types

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Primitives Data Types

Non – Primitives Data Types

Operators

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Arithmatic Operator

Assignment Operators

Comparison Operators

Logical Operators

Bitwise Operators

Type Coercion and Conversion

Conditional Statements (if, else if, else)

0/2

if, else if, else

Ternary Operator

Switch Statement

0/1

What is Switch Statement?

Loops

0/5

for…of and for…in Loops

Loop Control: break, continue

Functions

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What is Function ?

Function Declaration vs Function Expression

Parameters and Return Values

Default Parameters

Rest and Spread Syntax (…args)

Anonymous Functions

Arrow Functions

Higher-order Functions

Objects

0/6

Creating objects

Accessing and Modifying Properties

Methods in objects

this Keyword and its Behavior

Object Destructuring

Arrays

0/5

Array Declaration and Initialization

Accessing and Modifying Array Elements

Spread Syntax with Arrays

Array Destructuring

DOM Manipulation

0/4

What is DOM Manipulation?

Selecting Elements

Changing Content and Styles

Adding and Removing Elements Dynamically

Events and Event Listeners

0/7

What is Events and Event Listeners?

Common Event Types and Practical Examples

Removing Event Listeners

Passing Parameters to Event Handlers

Event Delegation

Stopping Event Propagation

Classes in JavaScript

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Classes in JavaScript

Defining a Class

Objects in JavaScript

Real-World Example: User Class

Adding Getters and Setters

Inheritance in JavaScript

The this Keyword

String Functions in JavaScript

0/1

String Functions in JavaScript

Number Functions in Javascript

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Number Functions in JavaScript

Error Handling in JavaScript

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Error Handling in JavaScript

try…catch Block

Throwing Custom Errors

Combining try…catch with Custom Errors

RegEx (Regular Expressions) in JavaScript

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Basic Syntax of Regex (Regex)

String Methods Using Regex

Patterns and Flags

JavaScript

About Lesson

Rest and Spread Syntax (…args)

1. Rest:

Allows a function to accept an indefinite number of arguments as an array.

Example:

JavaScript

function sum(...numbers) {
  return numbers.reduce((total, num) => total + num); 
// reduce() method is used to iterate through the array and accumulate a result by applying a function to each element.
}

console.log(sum(1, 2, 3));  // Output: 6

2. Spread:

Expands an array into individual elements

Example:

JavaScript

let arr = [1, 2, 3];
console.log(...arr);  // Output: 1 2 3