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55 lines
2.4 KiB
55 lines
2.4 KiB
"use strict"; |
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var combineLatest_1 = require('../operators/combineLatest'); |
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/* tslint:enable:max-line-length */ |
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/** |
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* Combines multiple Observables to create an Observable whose values are |
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* calculated from the latest values of each of its input Observables. |
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* |
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* <span class="informal">Whenever any input Observable emits a value, it |
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* computes a formula using the latest values from all the inputs, then emits |
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* the output of that formula.</span> |
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* |
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* <img src="./img/combineLatest.png" width="100%"> |
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* |
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* `combineLatest` combines the values from this Observable with values from |
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* Observables passed as arguments. This is done by subscribing to each |
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* Observable, in order, and collecting an array of each of the most recent |
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* values any time any of the input Observables emits, then either taking that |
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* array and passing it as arguments to an optional `project` function and |
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* emitting the return value of that, or just emitting the array of recent |
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* values directly if there is no `project` function. |
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* |
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* @example <caption>Dynamically calculate the Body-Mass Index from an Observable of weight and one for height</caption> |
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* var weight = Rx.Observable.of(70, 72, 76, 79, 75); |
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* var height = Rx.Observable.of(1.76, 1.77, 1.78); |
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* var bmi = weight.combineLatest(height, (w, h) => w / (h * h)); |
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* bmi.subscribe(x => console.log('BMI is ' + x)); |
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* |
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* // With output to console: |
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* // BMI is 24.212293388429753 |
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* // BMI is 23.93948099205209 |
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* // BMI is 23.671253629592222 |
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* |
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* @see {@link combineAll} |
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* @see {@link merge} |
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* @see {@link withLatestFrom} |
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* |
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* @param {ObservableInput} other An input Observable to combine with the source |
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* Observable. More than one input Observables may be given as argument. |
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* @param {function} [project] An optional function to project the values from |
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* the combined latest values into a new value on the output Observable. |
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* @return {Observable} An Observable of projected values from the most recent |
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* values from each input Observable, or an array of the most recent values from |
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* each input Observable. |
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* @method combineLatest |
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* @owner Observable |
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*/ |
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function combineLatest() { |
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var observables = []; |
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for (var _i = 0; _i < arguments.length; _i++) { |
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observables[_i - 0] = arguments[_i]; |
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} |
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return combineLatest_1.combineLatest.apply(void 0, observables)(this); |
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} |
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exports.combineLatest = combineLatest; |
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//# sourceMappingURL=combineLatest.js.map
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