Frequently Used Array Examples Javascript|Typescript

In this blog post, We are going to learn Frequently used Array Examples in typescript and javascript

The array is a collection of elements/objects stored under one name. The size of the array is fixed. Developers must learn Array examples in typescripts.

You can check my post on Array Sort-Object Examples and Javascript Add,Delete from Array

Following is a list of frequently used array examples

How to remove an element or object from the Array

This example shows how to

• Delete / remove element from an array using Array.prototype.splice function
• First find an index of an element in an array using findIndex() function
• remove element from array using splice() function

var arrayStrings = new Array("one", "two", "there", "four");   
var deleteElement = "one";  
let index = this.arrayStrings.findIndex(d => d === deleteElement);   
this.arrayStrings.splice(index, 1);  
console.log(arrayStrings );  

Output:

0: "two"  
1: "there"  
2: "four"  

How to Create a Statically typed array of functions or callbacks in typescript

This example shows

1. How to Create an array of interfaces
2. How to create a Type array of callbacks or functions

First Create a named function of an interface that accepts strings and returns a void Create an array of interfaces

interface MyInterface {  
    (name: string): void;  
}  
var mycallback: MyInterface[] = [];  
console.log(mycallback)  

Or We can also use a typed array literal syntax for creating an array of functions

var myNewFunction: { (name: string): void; } [];  

How to retrieve the last element or object from an array in Javascript?

This example shows

• the last element of an array using an array.length-1 function
• How to find the length of an array using Array.length-1 element
• Get the Last element of an array | array.pop() method

var arrayStrings = new Array("one", "two", "there", "four");   
console.log(arrayStrings[arrayStrings.length-1] );  
console.log(arrayStrings.pop() );  

Output:

four  
four  

How to create a Static array in typescript class

This example shows

1. Create a Static private array of a class
2. the getSize method returns the static array size using the length function

class MyClass {  
    private static stringArray: string[] = ["one", "two", "three","four"];  
    getSize(): number {  
        return MyClass.stringArray.length;   
    }  
}  
var myobject = new MyClass();  
console.log(myobject.getSize());  

Output:

3