To create a custom pipe in Angular, you can follow these steps: 1. Generate a new pipe: Use the Angular CLI to generate a new pipe using the `ng generate pipe` command. Open your terminal and navigate to your Angular project's root directory, then run the following command: 

ng generate pipe custom
This will create a new file `custom.pipe.ts` and add it to the appropriate directory in your project. 2. Implement the pipe: Open the `custom.pipe.ts` file and implement your custom pipe logic within the `transform` method of the `CustomPipe` class. The `transform` method takes an input value and optional parameters, performs the desired transformation, and returns the result. Here's an example of a custom pipe that doubles a given number: 


import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'custom'
})
export class CustomPipe implements PipeTransform {
  transform(value: number): number {
    return value * 2;
  }
}
In this example, the `transform` method receives a number as input (`value`) and returns the result of doubling the input number (`value * 2`). 3. Register the pipe: To use the custom pipe in your Angular application, you need to register it in the module where it will be used. Open the corresponding module file (e.g., `app.module.ts`) and import the `CustomPipe` class. Then, add the `CustomPipe` to the `declarations` array in the module's decorator. 

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppComponent } from './app.component';
import { CustomPipe } from './custom.pipe';

@NgModule({
  declarations: [
    AppComponent,
    CustomPipe
  ],
  imports: [
    BrowserModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }
4. Use the custom pipe: Now that the custom pipe is registered, you can use it in your templates by referencing its name. For example, in your component's template (`app.component.html`), you can use the custom pipe like this: 

<h1>{{ 5 | custom }}</h1>
In this example, the `custom` pipe is applied to the value `5`, and the transformed result (10) will be displayed in the `<h1>` element. That's it! You have created a custom pipe in Angular. You can now use the pipe to perform custom transformations on data within your templates.