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Edit File: filter-spec.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var chai_1 = require("chai");
var operators_1 = require("rxjs/operators");
var testing_1 = require("rxjs/testing");
var rxjs_1 = require("rxjs");
var observableMatcher_1 = require("../helpers/observableMatcher");
describe('filter', function () {
    var testScheduler;
    beforeEach(function () {
        testScheduler = new testing_1.TestScheduler(observableMatcher_1.observableMatcher);
    });
    function oddFilter(x) {
        return +x % 2 === 1;
    }
    function isPrime(i) {
        if (+i <= 1) {
            return false;
        }
        var max = Math.floor(Math.sqrt(+i));
        for (var j = 2; j <= max; ++j) {
            if (+i % j === 0) {
                return false;
            }
        }
        return true;
    }
    it('should filter out even values', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --0--1--2--3--4--|');
            var e1subs = '  ^----------------!';
            var expected = '-----1-----3-----|';
            expectObservable(e1.pipe((0, operators_1.filter)(oddFilter))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     --3---5----7-------|';
            expectObservable(e1.pipe((0, operators_1.filter)(isPrime))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter with an always-true predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     --3-4-5-6--7-8--9--|';
            var predicate = function () {
                return true;
            };
            expectObservable(e1.pipe((0, operators_1.filter)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter with an always-false predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     -------------------|';
            var predicate = function () {
                return false;
            };
            expectObservable(e1.pipe((0, operators_1.filter)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, source unsubscribes early', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^-----------!       ';
            var expected = '     --3---5----7-       ';
            var unsub = '        ------------!       ';
            expectObservable(e1.pipe((0, operators_1.filter)(isPrime)), unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, source throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--#');
            var e1subs = '       ^------------------!';
            var expected = '     --3---5----7-------#';
            expectObservable(e1.pipe((0, operators_1.filter)(isPrime))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, but predicate throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^-------!           ';
            var expected = '     --3---5-#           ';
            var invoked = 0;
            function predicate(x) {
                invoked++;
                if (invoked === 4) {
                    throw 'error';
                }
                return isPrime(x);
            }
            expectObservable(e1.pipe((0, operators_1.filter)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, predicate with index', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     --3--------7-------|';
            function predicate(x, i) {
                return isPrime(+x + i * 10);
            }
            expectObservable(e1.pipe((0, operators_1.filter)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should invoke predicate once for each checked value', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     --3---5----7-------|';
            var invoked = 0;
            var predicate = function (x) {
                invoked++;
                return isPrime(x);
            };
            var result = e1.pipe((0, operators_1.filter)(predicate), (0, operators_1.tap)({
                complete: function () {
                    (0, chai_1.expect)(invoked).to.equal(7);
                },
            }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, predicate with index, source unsubscribes early', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^-----------!       ';
            var expected = '     --3--------7-       ';
            var unsub = '        ------------!       ';
            function predicate(x, i) {
                return isPrime(+x + i * 10);
            }
            expectObservable(e1.pipe((0, operators_1.filter)(predicate)), unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, predicate with index, source throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--#');
            var e1subs = '       ^------------------!';
            var expected = '     --3--------7-------#';
            function predicate(x, i) {
                return isPrime(+x + i * 10);
            }
            expectObservable(e1.pipe((0, operators_1.filter)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should filter in only prime numbers, predicate with index and throws', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^-------!           ';
            var expected = '     --3-----#           ';
            var invoked = 0;
            function predicate(x, i) {
                invoked++;
                if (invoked === 4) {
                    throw 'error';
                }
                return isPrime(+x + i * 10);
            }
            expectObservable(e1.pipe((0, operators_1.filter)(predicate))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should compose with another filter to allow multiples of six', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     --------6----------|';
            var result = e1.pipe((0, operators_1.filter)(function (x) { return +x % 2 === 0; }), (0, operators_1.filter)(function (x) { return +x % 3 === 0; }));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should be able to accept and use a thisArg', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     --------6----------|';
            var Filterer = (function () {
                function Filterer() {
                    this.filter1 = function (x) { return +x % 2 === 0; };
                    this.filter2 = function (x) { return +x % 3 === 0; };
                }
                return Filterer;
            }());
            var filterer = new Filterer();
            var result = e1.pipe((0, operators_1.filter)(function (x) {
                return this.filter1(x);
            }, filterer), (0, operators_1.filter)(function (x) {
                return this.filter2(x);
            }, filterer), (0, operators_1.filter)(function (x) {
                return this.filter1(x);
            }, filterer));
            expectObservable(result).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should be able to use filter and map composed', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^------------------!';
            var expected = '     ----a---b----c-----|';
            var values = { a: 16, b: 36, c: 64 };
            var result = e1.pipe((0, operators_1.filter)(function (x) { return +x % 2 === 0; }), (0, operators_1.map)(function (x) { return +x * +x; }));
            expectObservable(result).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should propagate errors from the source', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('  --0--1--2--3--4--#');
            var e1subs = '  ^----------------!';
            var expected = '-----1-----3-----#';
            expectObservable(e1.pipe((0, operators_1.filter)(oddFilter))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle empty', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' |   ');
            var e1subs = '  (^!)';
            var expected = '|   ';
            expectObservable(e1.pipe((0, operators_1.filter)(oddFilter))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle never', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' -');
            var e1subs = '  ^';
            var expected = '-';
            expectObservable(e1.pipe((0, operators_1.filter)(oddFilter))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should handle throw', function () {
        testScheduler.run(function (_a) {
            var cold = _a.cold, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = cold(' #   ');
            var e1subs = '  (^!)';
            var expected = '#   ';
            expectObservable(e1.pipe((0, operators_1.filter)(oddFilter))).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should send errors down the error path', function (done) {
        (0, rxjs_1.of)(42)
            .pipe((0, operators_1.filter)(function (x, index) {
            throw 'bad';
        }))
            .subscribe({
            next: function (x) {
                done(new Error('should not be called'));
            },
            error: function (err) {
                (0, chai_1.expect)(err).to.equal('bad');
                done();
            },
            complete: function () {
                done(new Error('should not be called'));
            },
        });
    });
    it('should not break unsubscription chain when unsubscribed explicitly', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var e1 = hot('-1--2--^-3-4-5-6--7-8--9--|');
            var e1subs = '       ^-----------!       ';
            var expected = '     --3---5----7-       ';
            var unsub = '        ------------!       ';
            var result = e1.pipe((0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }), (0, operators_1.filter)(isPrime), (0, operators_1.mergeMap)(function (x) { return (0, rxjs_1.of)(x); }));
            expectObservable(result, unsub).toBe(expected);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should support type guards without breaking previous behavior', function () {
        {
            var Foo = (function () {
                function Foo(bar, baz) {
                    if (bar === void 0) { bar = 'name'; }
                    if (baz === void 0) { baz = 42; }
                    this.bar = bar;
                    this.baz = baz;
                }
                return Foo;
            }());
            var isBar = function (x) { return x && x.bar !== undefined; };
            var isBaz = function (x) { return x && x.baz !== undefined; };
            var foo = new Foo();
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.filter)(function (foo) { return foo.baz === 42; }))
                .subscribe(function (x) { return x.baz; });
            (0, rxjs_1.of)(foo)
                .pipe((0, operators_1.filter)(isBar))
                .subscribe(function (x) { return x.bar; });
            var foobar = new Foo();
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.filter)(function (foobar) { return foobar.bar === 'name'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(foobar)
                .pipe((0, operators_1.filter)(isBar))
                .subscribe(function (x) { return x.bar; });
            var barish = { bar: 'quack', baz: 42 };
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.filter)(function (x) { return x.bar === 'quack'; }))
                .subscribe(function (x) { return x.bar; });
            (0, rxjs_1.of)(barish)
                .pipe((0, operators_1.filter)(isBar))
                .subscribe(function (bar) { return bar.bar; });
        }
        {
            var xs = (0, rxjs_1.from)([1, 'aaa', 3, 'bb']);
            var isString = function (x) { return typeof x === 'string'; };
            xs.pipe((0, operators_1.filter)(isString)).subscribe(function (s) { return s.length; });
            xs.pipe((0, operators_1.filter)(function (x) { return typeof x === 'number'; })).subscribe(function (x) { return x; });
            xs.pipe((0, operators_1.filter)(function (x, i) { return typeof x === 'number' && x > i; })).subscribe(function (x) { return x; });
        }
    });
    it('should support Boolean as a predicate', function () {
        testScheduler.run(function (_a) {
            var hot = _a.hot, expectObservable = _a.expectObservable, expectSubscriptions = _a.expectSubscriptions;
            var values = { t: 1, f: 0 };
            var e1 = hot('-t--f--^-t-f-t-f--t-f--f--|', values);
            var e1subs = '       ^------------------!';
            var expected = '     --t---t----t-------|';
            expectObservable(e1.pipe((0, operators_1.filter)(Boolean))).toBe(expected, values);
            expectSubscriptions(e1.subscriptions).toBe(e1subs);
        });
    });
    it('should stop listening to a synchronous observable when unsubscribed', function () {
        var sideEffects = [];
        var synchronousObservable = new rxjs_1.Observable(function (subscriber) {
            for (var i = 0; !subscriber.closed && i < 10; i++) {
                sideEffects.push(i);
                subscriber.next(i);
            }
        });
        synchronousObservable
            .pipe((0, operators_1.filter)(function () { return true; }), (0, operators_1.take)(3))
            .subscribe(function () {
        });
        (0, chai_1.expect)(sideEffects).to.deep.equal([0, 1, 2]);
    });
});
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