Menu
Posted At Mon, Nov 27, 2023 1:33 PM

JavaScript Arrays

Listen | 2 min read

Table of Contents

1. Introduction to JavaScript Arrays
- Definition and Purpose
- Key Characteristics
2. Creating Arrays
- Literal Notation
- Using the Array Constructor
3. Array Elements
- Accessing Elements
- Modifying Elements
4. Array Methods
- Iteration Methods
- Transformation Methods
- Stack and Queue Operations
- Searching and Filtering
5. Multi-dimensional Arrays
- Creating and Accessing
- Common Use Cases

1. Introduction to JavaScript Arrays

- Definition and Purpose

JavaScript arrays are versatile and widely-used data structures that store multiple values in a single variable. They provide a way to organize and manipulate collections of data efficiently.

- Key Characteristics

- Ordered:

Elements in an array are ordered and accessible by their index.
- Dynamic:
Arrays in JavaScript can dynamically adjust in size; elements can be added or removed.
- Homogeneous:
Arrays can hold elements of different types, including other arrays.

2. Creating Arrays

- Literal Notation

let fruits = ['Apple', 'Banana', 'Orange'];

- Using the Array Constructor

let numbers = new Array(1, 2, 3, 4, 5);

3. Array Elements

- Accessing Elements

let firstFruit = fruits[0]; // Accessing the first element

- Modifying Elements

fruits[1] = 'Grapes'; // Modifying the second element

4. Array Methods

- Iteration Methods

- forEach:
Executes a provided function once for each array element.

fruits.forEach(fruit => {
    console.log(fruit);
});

- Transformation Methods

- map:
Creates a new array by applying a function to each element.

let fruitLengths = fruits.map(fruit => fruit.length);


- Stack and Queue Operations

- push/pop:

Adds/removes elements from the end of the array (stack operations).
- unshift/shift: Adds/removes elements from the beginning of the array (queue operations).

- Searching and Filtering

- indexOf:
Returns the index of the first occurrence of a specified element.
- filter: Creates a new array with elements that pass a test.

5. Multi-dimensional Arrays

- Creating and Accessing

let matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];
let element = matrix[1][2]; // Accessing the element '6'

- Common Use Cases

-
Representing game boards.
Storing tabular data.

In conclusion, JavaScript arrays are fundamental for handling collections of data. Understanding their creation, manipulation, and various methods is crucial for effective programming in JavaScript.

1385 1

Comments