82 lines
2.0 KiB
JavaScript
82 lines
2.0 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.map = map;
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exports.constant = constant;
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exports.tap = tap;
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var _Stream = require('../Stream');
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var _Stream2 = _interopRequireDefault(_Stream);
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var _Map = require('../fusion/Map');
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var _Map2 = _interopRequireDefault(_Map);
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var _Pipe = require('../sink/Pipe');
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var _Pipe2 = _interopRequireDefault(_Pipe);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Transform each value in the stream by applying f to each
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* @param {function(*):*} f mapping function
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* @param {Stream} stream stream to map
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* @returns {Stream} stream containing items transformed by f
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*/
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function map(f, stream) {
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return new _Stream2.default(_Map2.default.create(f, stream.source));
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}
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/**
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* Replace each value in the stream with x
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* @param {*} x
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* @param {Stream} stream
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* @returns {Stream} stream containing items replaced with x
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*/
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/** @license MIT License (c) copyright 2010-2016 original author or authors */
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/** @author Brian Cavalier */
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/** @author John Hann */
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function constant(x, stream) {
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return map(function () {
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return x;
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}, stream);
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}
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/**
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* Perform a side effect for each item in the stream
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* @param {function(x:*):*} f side effect to execute for each item. The
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* return value will be discarded.
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* @param {Stream} stream stream to tap
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* @returns {Stream} new stream containing the same items as this stream
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*/
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function tap(f, stream) {
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return new _Stream2.default(new Tap(f, stream.source));
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}
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function Tap(f, source) {
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this.source = source;
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this.f = f;
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}
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Tap.prototype.run = function (sink, scheduler) {
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return this.source.run(new TapSink(this.f, sink), scheduler);
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};
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function TapSink(f, sink) {
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this.sink = sink;
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this.f = f;
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}
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TapSink.prototype.end = _Pipe2.default.prototype.end;
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TapSink.prototype.error = _Pipe2.default.prototype.error;
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TapSink.prototype.event = function (t, x) {
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var f = this.f;
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f(x);
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this.sink.event(t, x);
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}; |