Anil Singh | Code-sample.com

In Angular 2, there are two types of pipes i.e. 1.       pure 2.       impure The pure pipe is by default. Every pipe has been pure by default. If you want to make a pipe impure that time you will allow the setting pure flag to false. Stayed Informed   – What is Pipes? Pure Pipes:- Angular executes a pure pipe only when it detects a pure change to the input value. A pure change can be primitive or non-primitive. Primitive data are only single values, they have not special capabilities and the non-primitive data types are used to store the group of values. For example for pipe pure, import { Pipe, PipeTransform } from '@angular/core' ; @Pipe({     name: 'barcode' }) export class BarCodePipe implements PipeTransform {     transform(value: string , args: any []): string {         if (!value) {     ...