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

## Statements: 92.31% (48 / 52) Branches: 69.23% (18 / 26) Functions: 100% (11 / 11) Lines: 95.45% (42 / 44) Ignored: none

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

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    1'use strict';

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

    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);

    function distinctUntilChanged(compare, thisArg) {
        return this.lift(new DistinctUntilChangedOperator(thisArg ? _utilBindCallback2['default'](compare, thisArg, 2) : compare));
    }

    var DistinctUntilChangedOperator = (function () {
        function DistinctUntilChangedOperator(compare) {
            _classCallCheck(this, DistinctUntilChangedOperator);

            this.compare = compare;
        }

        DistinctUntilChangedOperator.prototype.call = function call(subscriber) {
            return new DistinctUntilChangedSubscriber(subscriber, this.compare);
        };

        return DistinctUntilChangedOperator;
    })();

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

        function DistinctUntilChangedSubscriber(destination, compare) {
            _classCallCheck(this, DistinctUntilChangedSubscriber);

            _Subscriber.call(this, destination);
            this.hasValue = false;
            if (typeof compare === 'function') {
                this.compare = compare;
            }
        }

        DistinctUntilChangedSubscriber.prototype.compare = function compare(x, y) {
            return x === y;
        };

        DistinctUntilChangedSubscriber.prototype._next = function _next(x) {
            var result = false;
            if (this.hasValue) {
                result = _utilTryCatch2['default'](this.compare)(this.value, x);
                Iif (result === _utilErrorObject.errorObject) {
                    this.destination.error(_utilErrorObject.errorObject.e);
                    return;
                }
            } else {
                this.hasValue = true;
            }
            if (Boolean(result) === false) {
                this.value = x;
                this.destination.next(x);
            }
        };

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

    module.exports = exports['default'];