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Contents
"use strict";
var takeWhile_1 = require('../operators/takeWhile');
/**
* Emits values emitted by the source Observable so long as each value satisfies
* the given `predicate`, and then completes as soon as this `predicate` is not
* satisfied.
*
* <span class="informal">Takes values from the source only while they pass the
* condition given. When the first value does not satisfy, it completes.</span>
*
* <img src="./img/takeWhile.png" width="100%">
*
* `takeWhile` subscribes and begins mirroring the source Observable. Each value
* emitted on the source is given to the `predicate` function which returns a
* boolean, representing a condition to be satisfied by the source values. The
* output Observable emits the source values until such time as the `predicate`
* returns false, at which point `takeWhile` stops mirroring the source
* Observable and completes the output Observable.
*
* @example <caption>Emit click events only while the clientX property is greater than 200</caption>
* var clicks = Rx.Observable.fromEvent(document, 'click');
* var result = clicks.takeWhile(ev => ev.clientX > 200);
* result.subscribe(x => console.log(x));
*
* @see {@link take}
* @see {@link takeLast}
* @see {@link takeUntil}
* @see {@link skip}
*
* @param {function(value: T, index: number): boolean} predicate A function that
* evaluates a value emitted by the source Observable and returns a boolean.
* Also takes the (zero-based) index as the second argument.
* @return {Observable<T>} An Observable that emits the values from the source
* Observable so long as each value satisfies the condition defined by the
* `predicate`, then completes.
* @method takeWhile
* @owner Observable
*/
function takeWhile(predicate) {
return takeWhile_1.takeWhile(predicate)(this);
}
exports.takeWhile = takeWhile;
//# sourceMappingURL=takeWhile.js.map
Version data entries
49 entries across 49 versions & 4 rubygems