Create Custom Pipe in Angular in Just 5 mins

An Angular custom pipe is a feature that allows you to create your own reusable transformation functions that can be used within Angular templates. Custom pipes are useful for transforming and formatting data before displaying it in the UI. They can be applied to values in template expressions using the pipe operator (|).

Here are some key points about Angular custom pipes:

Purpose: Custom pipes provide a way to encapsulate and reuse logic for transforming data in Angular applications. They help keep the templates clean and modular by separating the data manipulation logic from the presentation logic.

Implementation: A custom pipe in Angular is implemented as a TypeScript class that implements the PipeTransform interface. The interface requires the implementation of a single method called transform, which takes an input value and optional parameters and returns the transformed output.

Decorator: The custom pipe class is decorated with @Pipe, specifying the pipe's name that will be used in templates. The decorator provides metadata for Angular to identify and use the pipe correctly.

Usage: Custom pipes can be used within template expressions by chaining them with the pipe operator (|). The pipe operator takes the value to be transformed on the left side and passes it as the first argument to the transform method of the pipe class. Additional parameters can be provided after a colon (:) in the template expression.

Pure vs. Impure Pipes: Custom pipes can be either pure or impure. A pure pipe is stateless and only recalculates when the input value or parameters change. An impure pipe can have internal state and can be recalculated on every change detection cycle. Pure pipes are more efficient and recommended for most use cases, but impure pipes can be useful for scenarios that require frequent updates.

Pipe Chaining: Multiple custom pipes can be chained together in a template expression to apply multiple transformations to a value. The output of one pipe becomes the input for the next pipe in the chain.

Pipe Parameters: Custom pipes can accept additional parameters to customize their behavior. Parameters can be passed in the template expression after the pipe name, separated by colons (:) and commas (,).

Angular Dependency Injection: Custom pipes can also make use of Angular's dependency injection system to inject services or other dependencies they require for their transformation logic.

Overall, Angular custom pipes provide a powerful mechanism for data transformation and formatting within Angular templates. They help in creating reusable and modular code while keeping the templates clean and readable.

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