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

## Statements: 94.44% (68 / 72) Branches: 75% (24 / 32) Functions: 100% (11 / 11) Lines: 96.88% (62 / 64) Ignored: none

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

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    1'use strict';

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

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

    var _utilEmptyError2 = _interopRequireDefault(_utilEmptyError);

    function first(predicate, resultSelector, defaultValue) {
        return this.lift(new FirstOperator(predicate, resultSelector, defaultValue, this));
    }

    var FirstOperator = (function () {
        function FirstOperator(predicate, resultSelector, defaultValue, source) {
            _classCallCheck(this, FirstOperator);

            this.predicate = predicate;
            this.resultSelector = resultSelector;
            this.defaultValue = defaultValue;
            this.source = source;
        }

        FirstOperator.prototype.call = function call(observer) {
            return new FirstSubscriber(observer, this.predicate, this.resultSelector, this.defaultValue, this.source);
        };

        return FirstOperator;
    })();

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

        function FirstSubscriber(destination, predicate, resultSelector, defaultValue, source) {
            _classCallCheck(this, FirstSubscriber);

            _Subscriber.call(this, destination);
            this.predicate = predicate;
            this.resultSelector = resultSelector;
            this.defaultValue = defaultValue;
            this.source = source;
            this.index = 0;
            this.hasCompleted = false;
        }

        FirstSubscriber.prototype._next = function _next(value) {
            var destination = this.destination;
            var predicate = this.predicate;
            var resultSelector = this.resultSelector;

            var index = this.index++;
            var passed = true;
            if (predicate) {
                passed = _utilTryCatch2['default'](predicate)(value, index, this.source);
                if (passed === _utilErrorObject.errorObject) {
                    destination.error(_utilErrorObject.errorObject.e);
                    return;
                }
            }
            if (passed) {
                if (resultSelector) {
                    value = _utilTryCatch2['default'](resultSelector)(value, index);
                    Iif (value === _utilErrorObject.errorObject) {
                        destination.error(_utilErrorObject.errorObject.e);
                        return;
                    }
                }
                destination.next(value);
                destination.complete();
                this.hasCompleted = true;
            }
        };

        FirstSubscriber.prototype._complete = function _complete() {
            var destination = this.destination;
            if (!this.hasCompleted && typeof this.defaultValue !== 'undefined') {
                destination.next(this.defaultValue);
                destination.complete();
            } else Eif (!this.hasCompleted) {
                destination.error(new _utilEmptyError2['default']());
            }
        };

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

    module.exports = exports['default'];