| /** PURE_IMPORTS_START .._Subscriber PURE_IMPORTS_END */ |
| var __extends = (this && this.__extends) || function (d, b) { |
| for (var p in b) |
| if (b.hasOwnProperty(p)) |
| d[p] = b[p]; |
| function __() { this.constructor = d; } |
| d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); |
| }; |
| import { Subscriber } from '../Subscriber'; |
| /** |
| * Applies a given `project` function to each value emitted by the source |
| * Observable, and emits the resulting values as an Observable. |
| * |
| * <span class="informal">Like [Array.prototype.map()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map), |
| * it passes each source value through a transformation function to get |
| * corresponding output values.</span> |
| * |
| * <img src="./img/map.png" width="100%"> |
| * |
| * Similar to the well known `Array.prototype.map` function, this operator |
| * applies a projection to each value and emits that projection in the output |
| * Observable. |
| * |
| * @example <caption>Map every click to the clientX position of that click</caption> |
| * var clicks = Rx.Observable.fromEvent(document, 'click'); |
| * var positions = clicks.map(ev => ev.clientX); |
| * positions.subscribe(x => console.log(x)); |
| * |
| * @see {@link mapTo} |
| * @see {@link pluck} |
| * |
| * @param {function(value: T, index: number): R} project The function to apply |
| * to each `value` emitted by the source Observable. The `index` parameter is |
| * the number `i` for the i-th emission that has happened since the |
| * subscription, starting from the number `0`. |
| * @param {any} [thisArg] An optional argument to define what `this` is in the |
| * `project` function. |
| * @return {Observable<R>} An Observable that emits the values from the source |
| * Observable transformed by the given `project` function. |
| * @method map |
| * @owner Observable |
| */ |
| export function map(project, thisArg) { |
| return function mapOperation(source) { |
| if (typeof project !== 'function') { |
| throw new TypeError('argument is not a function. Are you looking for `mapTo()`?'); |
| } |
| return source.lift(new MapOperator(project, thisArg)); |
| }; |
| } |
| export var MapOperator = /*@__PURE__*/ (/*@__PURE__*/ function () { |
| function MapOperator(project, thisArg) { |
| this.project = project; |
| this.thisArg = thisArg; |
| } |
| MapOperator.prototype.call = function (subscriber, source) { |
| return source.subscribe(new MapSubscriber(subscriber, this.project, this.thisArg)); |
| }; |
| return MapOperator; |
| }()); |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @ignore |
| * @extends {Ignored} |
| */ |
| var MapSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) { |
| __extends(MapSubscriber, _super); |
| function MapSubscriber(destination, project, thisArg) { |
| _super.call(this, destination); |
| this.project = project; |
| this.count = 0; |
| this.thisArg = thisArg || this; |
| } |
| // NOTE: This looks unoptimized, but it's actually purposefully NOT |
| // using try/catch optimizations. |
| MapSubscriber.prototype._next = function (value) { |
| var result; |
| try { |
| result = this.project.call(this.thisArg, value, this.count++); |
| } |
| catch (err) { |
| this.destination.error(err); |
| return; |
| } |
| this.destination.next(result); |
| }; |
| return MapSubscriber; |
| }(Subscriber)); |
| //# sourceMappingURL=map.js.map |