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Introduction to Arrays

What is an Array in JavaScript?​

An array is a data structure that can hold more than one value at a time. It is a collection of elements, each identified by a numeric index.

Examples of Arrays​

  • String Array:

    const stringArray = ["apple", "banana", "orange"];

  • Number Array:

    const numberArray = [1, 2, 3, 4, 5];

  • Boolean Array:

    const booleanArray = [true, false, true];

  • Mixed Array:

    const mixedArray = ["apple", 2, true, null, undefined];

  • Undefined and Null Array:

    const nullUndefinedArray = [undefined, null];

Creating a Custom Array​

Here is a basic template for creating a custom array in JavaScript.

class MyArray {
  constructor() {
    this.length = 0;
    this.data = {};
  }
}

const myArray = new MyArray();
console.log(myArray);

Output​

MyArray { length: 0, data: {} }