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

## Statements: 96.92% (63 / 65) Branches: 80% (24 / 30) Functions: 100% (12 / 12) Lines: 100% (57 / 57) Ignored: none

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

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    1'use strict';

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

    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);

    /**
     * buffers a number of values from the source observable by `bufferSize` then emits the buffer and clears it, and starts a
     * new buffer each `startBufferEvery` values. If `startBufferEvery` is not provided or is `null`, then new buffers are
     * started immediately at the start of the source and when each buffer closes and is emitted.
     * @param {number} bufferSize the maximum size of the buffer emitted.
     * @param {number} [startBufferEvery] optional interval at which to start a new buffer. (e.g. if `startBufferEvery` is `2`,asdf then a
     *   new buffer will be started on every other value from the source.) A new buffer is started at the beginning of the source by default.
     * @returns {Observable<T[]>} an observable of arrays of buffered values.
     */

    function bufferCount(bufferSize) {
        var startBufferEvery = arguments.length <= 1 || arguments[1] === undefined ? null : arguments[1];

        return this.lift(new BufferCountOperator(bufferSize, startBufferEvery));
    }

    var BufferCountOperator = (function () {
        function BufferCountOperator(bufferSize, startBufferEvery) {
            _classCallCheck(this, BufferCountOperator);

            this.bufferSize = bufferSize;
            this.startBufferEvery = startBufferEvery;
        }

        BufferCountOperator.prototype.call = function call(subscriber) {
            return new BufferCountSubscriber(subscriber, this.bufferSize, this.startBufferEvery);
        };

        return BufferCountOperator;
    })();

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

        function BufferCountSubscriber(destination, bufferSize, startBufferEvery) {
            _classCallCheck(this, BufferCountSubscriber);

            _Subscriber.call(this, destination);
            this.bufferSize = bufferSize;
            this.startBufferEvery = startBufferEvery;
            this.buffers = [[]];
            this.count = 0;
        }

        BufferCountSubscriber.prototype._next = function _next(value) {
            var count = this.count += 1;
            var destination = this.destination;
            var bufferSize = this.bufferSize;
            var startBufferEvery = this.startBufferEvery == null ? bufferSize : this.startBufferEvery;
            var buffers = this.buffers;
            var len = buffers.length;
            var remove = -1;
            if (count % startBufferEvery === 0) {
                buffers.push([]);
            }
            for (var i = 0; i < len; i++) {
                var buffer = buffers[i];
                buffer.push(value);
                if (buffer.length === bufferSize) {
                    remove = i;
                    this.destination.next(buffer);
                }
            }
            if (remove !== -1) {
                buffers.splice(remove, 1);
            }
        };

        BufferCountSubscriber.prototype._error = function _error(err) {
            this.destination.error(err);
        };

        BufferCountSubscriber.prototype._complete = function _complete() {
            var destination = this.destination;
            var buffers = this.buffers;
            while (buffers.length > 0) {
                var buffer = buffers.shift();
                if (buffer.length > 0) {
                    destination.next(buffer);
                }
            }
            destination.complete();
        };

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

    module.exports = exports['default'];