ix/src/add/iterable-operators/filter.ts

The Interactive Extensions for JavaScript

import { IterableX } from '../../iterable/iterablex.js';
import { filter } from '../../iterable/operators/filter.js';

/**
 * @ignore
 */
export function filterProto<T, S extends T>(
  this: IterableX<T>,
  predicate: (value: T, index: number) => value is S,
  thisArg?: any
): IterableX<S>;
export function filterProto<T>(
  this: IterableX<T>,
  predicate: (value: T, index: number) => boolean,
  thisArg?: any
): IterableX<T>;
export function filterProto<T>(
  this: IterableX<T>,
  predicate: (value: T, index: number) => boolean,
  thisArg?: any
): IterableX<T> {
  return filter(predicate, thisArg)(this);
}

IterableX.prototype.filter = filterProto;

declare module '../../iterable/iterablex' {
  interface IterableX<T> {
    filter: typeof filterProto;
  }
}