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If the source Observable terminates with an error, `count`\n * will pass this error notification along without emitting an value first. If\n * the source Observable does not terminate at all, `count` will neither emit\n * a value nor terminate. This operator takes an optional `predicate` function\n * as argument, in which case the output emission will represent the number of\n * source values that matched `true` with the `predicate`.\n *\n * @example Counts how many seconds have passed before the first click happened\n * var seconds = Rx.Observable.interval(1000);\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var secondsBeforeClick = seconds.takeUntil(clicks);\n * var result = secondsBeforeClick.count();\n * result.subscribe(x => console.log(x));\n *\n * @example Counts how many odd numbers are there between 1 and 7\n * var numbers = Rx.Observable.range(1, 7);\n * var result = numbers.count(i => i % 2 === 1);\n * result.subscribe(x => console.log(x));\n *\n * @see {@link max}\n * @see {@link min}\n * @see {@link reduce}\n *\n * @param {function(value: T, i: number, source: Observable): boolean} [predicate] A\n * boolean function to select what values are to be counted. It is provided with\n * arguments of:\n * - `value`: the value from the source Observable.\n * - `index`: the (zero-based) \"index\" of the value from the source Observable.\n * - `source`: the source Observable instance itself.\n * @return {Observable} An Observable of one number that represents the count as\n * described above.\n * @method count\n * @owner Observable\n ", "range": [ 44, 2065 ], "loc": { "start": { "line": 2, "column": 0 }, "end": { "line": 46, "column": 3 } } }, { "type": "Block", "value": "*\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n ", "range": [ 2518, 2609 ], "loc": { "start": { "line": 60, "column": 0 }, "end": { "line": 64, "column": 3 } } }, { "type": "Line", "value": "# sourceMappingURL=count.js.map", "range": [ 3635, 3668 ], "loc": { "start": { "line": 101, "column": 0 }, "end": { "line": 101, "column": 33 } } } ] }