55 lines
2.4 KiB
JavaScript
Executable File
55 lines
2.4 KiB
JavaScript
Executable File
/** PURE_IMPORTS_START .._operators_combineLatest PURE_IMPORTS_END */
|
|
import { combineLatest as higherOrder } from '../operators/combineLatest';
|
|
/* tslint:enable:max-line-length */
|
|
/**
|
|
* Combines multiple Observables to create an Observable whose values are
|
|
* calculated from the latest values of each of its input Observables.
|
|
*
|
|
* <span class="informal">Whenever any input Observable emits a value, it
|
|
* computes a formula using the latest values from all the inputs, then emits
|
|
* the output of that formula.</span>
|
|
*
|
|
* <img src="./img/combineLatest.png" width="100%">
|
|
*
|
|
* `combineLatest` combines the values from this Observable with values from
|
|
* Observables passed as arguments. This is done by subscribing to each
|
|
* Observable, in order, and collecting an array of each of the most recent
|
|
* values any time any of the input Observables emits, then either taking that
|
|
* array and passing it as arguments to an optional `project` function and
|
|
* emitting the return value of that, or just emitting the array of recent
|
|
* values directly if there is no `project` function.
|
|
*
|
|
* @example <caption>Dynamically calculate the Body-Mass Index from an Observable of weight and one for height</caption>
|
|
* var weight = Rx.Observable.of(70, 72, 76, 79, 75);
|
|
* var height = Rx.Observable.of(1.76, 1.77, 1.78);
|
|
* var bmi = weight.combineLatest(height, (w, h) => w / (h * h));
|
|
* bmi.subscribe(x => console.log('BMI is ' + x));
|
|
*
|
|
* // With output to console:
|
|
* // BMI is 24.212293388429753
|
|
* // BMI is 23.93948099205209
|
|
* // BMI is 23.671253629592222
|
|
*
|
|
* @see {@link combineAll}
|
|
* @see {@link merge}
|
|
* @see {@link withLatestFrom}
|
|
*
|
|
* @param {ObservableInput} other An input Observable to combine with the source
|
|
* Observable. More than one input Observables may be given as argument.
|
|
* @param {function} [project] An optional function to project the values from
|
|
* the combined latest values into a new value on the output Observable.
|
|
* @return {Observable} An Observable of projected values from the most recent
|
|
* values from each input Observable, or an array of the most recent values from
|
|
* each input Observable.
|
|
* @method combineLatest
|
|
* @owner Observable
|
|
*/
|
|
export function combineLatest() {
|
|
var observables = [];
|
|
for (var _i = 0; _i < arguments.length; _i++) {
|
|
observables[_i - 0] = arguments[_i];
|
|
}
|
|
return higherOrder.apply(void 0, observables)(this);
|
|
}
|
|
//# sourceMappingURL=combineLatest.js.map
|