Declaration and Initialization using Array Constructor in Ja

Array Constructor in JavaScript

The Array() constructor is a built-in JavaScript function used to create a new array object. It can be called with or without the new keyword. When called without any arguments, the Array() constructor creates an empty array with no elements.

Array:

• In JavaScript, An array is one of the most commonly used data types.
• It stores multiple values and elements in one variable.
• These values can be of any data type — You can store a string, number, boolean, and other data types in one variable.
• There are two standard ways to declare an array in JavaScript. - (constructor or the literal notation).
• Arrays in JavaScript can dynamically change in size, meaning you can add or remove elements as needed

syntax:

new Array()
new Array(newElement)
new Array(newElement, newElement2)
new Array(newElement, newElement2, /* … ,*/ newElemenet10)
new Array(arrayLength) //number type only

Note: Array() can be called with or without new. Both create a new Array instance. Array()
Array(newElement)

Declaration

constructor

const newArray = new Array(); console.log(newArray); // Output: []

literal notation

let notationArray = [];
console.log(notationArray); // Output: []

Array declared both ways.

Initialization

You can also pass one or more arguments to the Array() constructor, specifying the initial values of the array elements

constructor

const newArray = new Array(5, 6, 7); console.log(newArray); // Output: [5, 6, 7]

 iteral notation

let notationArray = [2, 3, 4];
console.log(notationArray); // Output: [2, 3, 4]

Note: that when passing a single numeric argument to the Array() constructor, it specifies the initial length of the array Create arrays with a dynamic length by passing a numeric argument that specifies the initial length of the array For Ex, const newArray = new Array(10); // creates an array with length 10 console.log(newArray); // Output: [empty × 10]    If you pass a single non-numeric argument to the Array() constructor, it will be treated as the initial value of the first element of the array.

constnewArray = new Array(true);  console.log(newArray); // [true] 

• It is not compulsory to add new, as both Array() and new Array() perform the same task.

const newArray= Array("hpkingdom.com", '100%', true);  console.log(newArray);  // ["hpkingdom.com", '100%', true] 

  Array-like Objects: The Array() constructor can also be used to convert array-like objects (objects with a length property and indexed elements) into actual arrays. For Ex:   In this article, you have learned how to Initialize an array constructor in JavaScript.