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

## Statements: 97.01% (65 / 67) Branches: 80% (24 / 30) Functions: 100% (12 / 12) Lines: 100% (59 / 59) Ignored: none

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

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    1'use strict';

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

    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);

    var _utilEmptyError = require('../util/EmptyError');

    var _utilEmptyError2 = _interopRequireDefault(_utilEmptyError);

    function single(predicate, thisArg) {
        return this.lift(new SingleOperator(predicate, thisArg, this));
    }

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

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

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

        return SingleOperator;
    })();

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

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

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

        SingleSubscriber.prototype.applySingleValue = function applySingleValue(value) {
            if (this.seenValue) {
                this.destination.error('Sequence contains more than one element');
            } else {
                this.seenValue = true;
                this.singleValue = value;
            }
        };

        SingleSubscriber.prototype._next = function _next(value) {
            var predicate = this.predicate;
            var currentIndex = this.index++;
            if (predicate) {
                var result = _utilTryCatch2['default'](predicate)(value, currentIndex, this.source);
                if (result === _utilErrorObject.errorObject) {
                    this.destination.error(result.e);
                } else if (result) {
                    this.applySingleValue(value);
                }
            } else {
                this.applySingleValue(value);
            }
        };

        SingleSubscriber.prototype._complete = function _complete() {
            var destination = this.destination;
            if (this.index > 0) {
                destination.next(this.seenValue ? this.singleValue : undefined);
                destination.complete();
            } else {
                destination.error(new _utilEmptyError2['default']());
            }
        };

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

    module.exports = exports['default'];