Syntax

Hello World

Rules

Naming Conventions

Comments

Variables

Declaration

Initialization

Both at once

Constants

Data types

Primitives

Compound

Array

Defining

Declaring

Strings

Structures

Interfaces

Classes

Creating objects

Using objects

Operators

Spread/rest operator

• ...

  • Spread: Used to expand iterables (like array and objects) into individual elements

    • Array Expansion

          const arr1 = [1, 2, 3];
          const arr2 = [...arr1, 4, 5];
          console.log(arr2); // Output: [1, 2, 3, 4, 5]
      

    • Function Arguments

      const numbers = [1, 2, 3];
      const sum = (a, b, c) => a + b + c;
      console.log(sum(...numbers)); // Output: 6
      

    • Object Spread

          const obj1 = { a: 1, b: 2 };
          const obj2 = { ...obj1, c: 3 };
          console.log(obj2); // Output: { a: 1, b: 2, c: 3 }
      

  • Rest: Used to collect all arguments into an array.

        function sum(...args) {
                return args.reduce((acc, val) => acc + val, 0);
            }   
    
            console.log(sum(1, 2, 3, 4)); // Output: 10
    

    Context within which it is used whether it is a spread or rest operator.

Flow

Conditionals

Loops

Functions/Methods

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