# Code coverage report for RxJS/dist/cjs/operators/count.js

## Statements: 96.49% (55 / 57) Branches: 75% (18 / 24) Functions: 100% (11 / 11) Lines: 100% (49 / 49) Ignored: none

All files » RxJS/dist/cjs/operators/ » count.js

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    1'use strict';

    exports.__esModule = true;
    exports['default'] = count;

    function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

    function _inherits(subClass, superClass) { Iif (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); Eif (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

    function _classCallCheck(instance, Constructor) { Iif (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }

    var _Subscriber2 = require('../Subscriber');

    var _Subscriber3 = _interopRequireDefault(_Subscriber2);

    var _utilTryCatch = require('../util/tryCatch');

    var _utilTryCatch2 = _interopRequireDefault(_utilTryCatch);

    var _utilErrorObject = require('../util/errorObject');

    var _utilBindCallback = require('../util/bindCallback');

    var _utilBindCallback2 = _interopRequireDefault(_utilBindCallback);

    /**
     * Returns an observable of a single number that represents the number of items that either:
     * Match a provided predicate function, _or_ if a predicate is not provided, the number
     * represents the total count of all items in the source observable. The count is emitted
     * by the returned observable when the source observable completes.
     * @param {function} [predicate] a boolean function to select what values are to be counted.
     * it is provided with arguments of:
     *   - `value`: the value from the source observable
     *   - `index`: the "index" of the value from the source observable
     *   - `source`: the source observable instance itself.
     * @param {any} [thisArg] the optional `this` context to use in the `predicate` function
     * @returns {Observable} an observable of one number that represents the count as described
     * above
     */

    function count(predicate, thisArg) {
        return this.lift(new CountOperator(predicate, thisArg, this));
    }

    var CountOperator = (function () {
        function CountOperator(predicate, thisArg, source) {
            _classCallCheck(this, CountOperator);

            this.predicate = predicate;
            this.thisArg = thisArg;
            this.source = source;
        }

        CountOperator.prototype.call = function call(subscriber) {
            return new CountSubscriber(subscriber, this.predicate, this.thisArg, this.source);
        };

        return CountOperator;
    })();

    var CountSubscriber = (function (_Subscriber) {
        _inherits(CountSubscriber, _Subscriber);

        function CountSubscriber(destination, predicate, thisArg, source) {
            _classCallCheck(this, CountSubscriber);

            _Subscriber.call(this, destination);
            this.thisArg = thisArg;
            this.source = source;
            this.count = 0;
            this.index = 0;
            if (typeof predicate === 'function') {
                this.predicate = _utilBindCallback2['default'](predicate, thisArg, 3);
            }
        }

        CountSubscriber.prototype._next = function _next(value) {
            var predicate = this.predicate;
            var passed = true;
            if (predicate) {
                passed = _utilTryCatch2['default'](predicate)(value, this.index++, this.source);
                if (passed === _utilErrorObject.errorObject) {
                    this.destination.error(passed.e);
                    return;
                }
            }
            if (passed) {
                this.count += 1;
            }
        };

        CountSubscriber.prototype._complete = function _complete() {
            this.destination.next(this.count);
            this.destination.complete();
        };

        return CountSubscriber;
    })(_Subscriber3['default']);

    module.exports = exports['default'];