PipeTransform
To create a Pipe, you must implement this interface.
interface PipeTransform {
transform(value: any, ...args: any[]): any
}
Description
Angular invokes the transform method with the value of a binding
as the first argument, and any parameters as the second argument in list form.
Methods
Usage notes
Example
The RepeatPipe below repeats the value as many times as indicated by the first argument:
import {Pipe, PipeTransform} from '@angular/core';
@Pipe({name: 'repeat'})
export class RepeatPipe implements PipeTransform {
transform(value: any, times: number) {
return value.repeat(times);
}
}
Invoking {{ 'ok' | repeat:3 }} in a template produces okokok.