| import { filter as higherOrderFilter } from '../operators/filter'; |
| /* tslint:enable:max-line-length */ |
| /** |
| * Filter items emitted by the source Observable by only emitting those that |
| * satisfy a specified predicate. |
| * |
| * <span class="informal">Like |
| * [Array.prototype.filter()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter), |
| * it only emits a value from the source if it passes a criterion function.</span> |
| * |
| * <img src="./img/filter.png" width="100%"> |
| * |
| * Similar to the well-known `Array.prototype.filter` method, this operator |
| * takes values from the source Observable, passes them through a `predicate` |
| * function and only emits those values that yielded `true`. |
| * |
| * @example <caption>Emit only click events whose target was a DIV element</caption> |
| * var clicks = Rx.Observable.fromEvent(document, 'click'); |
| * var clicksOnDivs = clicks.filter(ev => ev.target.tagName === 'DIV'); |
| * clicksOnDivs.subscribe(x => console.log(x)); |
| * |
| * @see {@link distinct} |
| * @see {@link distinctUntilChanged} |
| * @see {@link distinctUntilKeyChanged} |
| * @see {@link ignoreElements} |
| * @see {@link partition} |
| * @see {@link skip} |
| * |
| * @param {function(value: T, index: number): boolean} predicate A function that |
| * evaluates each value emitted by the source Observable. If it returns `true`, |
| * the value is emitted, if `false` the value is not passed to the output |
| * Observable. The `index` parameter is the number `i` for the i-th source |
| * emission that has happened since the subscription, starting from the number |
| * `0`. |
| * @param {any} [thisArg] An optional argument to determine the value of `this` |
| * in the `predicate` function. |
| * @return {Observable} An Observable of values from the source that were |
| * allowed by the `predicate` function. |
| * @method filter |
| * @owner Observable |
| */ |
| export function filter(predicate, thisArg) { |
| return higherOrderFilter(predicate, thisArg)(this); |
| } |
| //# sourceMappingURL=filter.js.map |
