ix/iterable/operators/filter.mjs

The Interactive Extensions for JavaScript

import { IterableX } from '../iterablex.mjs';
/** @ignore */
export class FilterIterable extends IterableX {
    constructor(source, predicate, thisArg) {
        super();
        this._source = source;
        this._predicate = predicate;
        this._thisArg = thisArg;
    }
    *[Symbol.iterator]() {
        let i = 0;
        for (const item of this._source) {
            if (this._predicate.call(this._thisArg, item, i++)) {
                yield item;
            }
        }
    }
}
/**
 * Filters the elements of an iterable sequence based on a predicate.
 *
 * @template TSource The type of the elements in the source sequence.
 * @param {((value: TSource, index: number) => boolean)} predicate A function to test each source element for a condition.
 * @param {*} [thisArg] Optional this for binding.
 * @returns {OperatorFunction<TSource, TSource>} An operator which returns an iterable
 * sequence that contains elements from the input sequence that satisfy the condition.
 */
export function filter(predicate, thisArg) {
    return function filterOperatorFunction(source) {
        return new FilterIterable(source, predicate, thisArg);
    };
}

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