How to pass function as arg Pipe angular2

Question

I'd like to have a generic fields filter that will get the filter function as an argument and use it in filter

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

@Pipe({
  name: 'FieldsFilter'
})
@Injectable()
export class FieldsFilter implements PipeTransform {
  transform(fields: any[], args: any[]): any {
    return fields.filter(args[0]);//pass function to filter
  }
}

So I could use it in multiple places with different filter functions.

How do I pass the filter function?

Answer 1

@Pipe({
  name: 'FieldsFilter'
})
@Injectable()
export class FieldsFilter implements PipeTransform {
  transform(fields: any[], f): any {
    return fields.filter((e) => f(e));
  }
}

it was changed quite a while ago that additional pipe parameters are passed to individual parameters instead of as single parameter in the form of an array.