spec-js/operators/reduce-spec.js
"use strict";
var chai_1 = require('chai');
var Rx = require('../../dist/package/Rx');
var Observable = Rx.Observable;
/** @test {reduce} */
describe('Observable.prototype.reduce', function () {
asDiagram('reduce((acc, curr) => acc + curr, 0)')('should reduce', function () {
var values = {
a: 1, b: 3, c: 5, x: 9
};
var e1 = hot('--a--b--c--|', values);
var e1subs = '^ !';
var expected = '-----------(x|)';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, 0)).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce with seed', function () {
var e1 = hot('--a--b--|');
var e1subs = '^ !';
var expected = '--------(x|)';
var seed = 'n';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, seed)).toBe(expected, { x: seed + 'ab' });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce with a seed of undefined', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---------------------(x|)';
var values = {
x: 'undefined b c d e f g'
};
var source = e1.reduce(function (acc, x) { return acc + ' ' + x; }, undefined);
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce without a seed', function () {
var e1 = hot('--a--^--b--c--d--e--f--g--|');
var e1subs = '^ !';
var expected = '---------------------(x|)';
var values = {
x: 'b c d e f g'
};
var source = e1.reduce(function (acc, x) { return acc + ' ' + x; });
expectObservable(source).toBe(expected, values);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce with index without seed', function (done) {
var idx = [1, 2, 3, 4, 5];
Observable.range(0, 6).reduce(function (acc, value, index) {
chai_1.expect(idx.shift()).to.equal(index);
return value;
}).subscribe(null, null, function () {
chai_1.expect(idx).to.be.empty;
done();
});
});
it('should reduce with index with seed', function (done) {
var idx = [0, 1, 2, 3, 4, 5];
Observable.range(0, 6).reduce(function (acc, value, index) {
chai_1.expect(idx.shift()).to.equal(index);
return value;
}, -1).subscribe(null, null, function () {
chai_1.expect(idx).to.be.empty;
done();
});
});
it('should reduce with seed if source is empty', function () {
var e1 = hot('--a--^-------|');
var e1subs = '^ !';
var expected = '--------(x|)';
var expectedValue = '42';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, expectedValue)).toBe(expected, { x: expectedValue });
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if reduce function throws without seed', function () {
var e1 = hot('--a--b--|');
var e1subs = '^ ! ';
var expected = '-----# ';
var reduceFunction = function (o, x) {
throw 'error';
};
expectObservable(e1.reduce(reduceFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should allow unsubscribing explicitly and early', function () {
var e1 = hot('--a--b--|');
var unsub = ' ! ';
var e1subs = '^ ! ';
var expected = '------- ';
var reduceFunction = function (o, x) {
return o + x;
};
var result = e1.reduce(reduceFunction);
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not break unsubscription chains when result is unsubscribed explicitly', function () {
var e1 = hot('--a--b--|');
var e1subs = '^ ! ';
var expected = '------- ';
var unsub = ' ! ';
var reduceFunction = function (o, x) {
return o + x;
};
var result = e1
.mergeMap(function (x) { return Observable.of(x); })
.reduce(reduceFunction)
.mergeMap(function (x) { return Observable.of(x); });
expectObservable(result, unsub).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source emits and raises error with seed', function () {
var e1 = hot('--a--b--#');
var e1subs = '^ !';
var expected = '--------#';
var expectedValue = '42';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, expectedValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source raises error with seed', function () {
var e1 = hot('----#');
var e1subs = '^ !';
var expected = '----#';
var expectedValue = '42';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, expectedValue)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if reduce function throws with seed', function () {
var e1 = hot('--a--b--|');
var e1subs = '^ ! ';
var expected = '--# ';
var seed = 'n';
var reduceFunction = function (o, x) {
throw 'error';
};
expectObservable(e1.reduce(reduceFunction, seed)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete with seed if source emits but does not completes', function () {
var e1 = hot('--a--');
var e1subs = '^ ';
var expected = '-----';
var seed = 'n';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, seed)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete with seed if source never completes', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
var seed = 'n';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction, seed)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete without seed if source emits but does not completes', function () {
var e1 = hot('--a--b--');
var e1subs = '^ ';
var expected = '--------';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should not complete without seed if source never completes', function () {
var e1 = cold('-');
var e1subs = '^';
var expected = '-';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should reduce if source does not emit without seed', function () {
var e1 = hot('--a--^-------|');
var e1subs = '^ !';
var expected = '--------|';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source emits and raises error without seed', function () {
var e1 = hot('--a--b--#');
var e1subs = '^ !';
var expected = '--------#';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should raise error if source raises error without seed', function () {
var e1 = hot('----#');
var e1subs = '^ !';
var expected = '----#';
var reduceFunction = function (o, x) {
return o + x;
};
expectObservable(e1.reduce(reduceFunction)).toBe(expected);
expectSubscriptions(e1.subscriptions).toBe(e1subs);
});
it('should accept array typed reducers', function () {
type(function () {
var a;
a.reduce(function (acc, value) { return acc.concat(value); }, []);
});
});
it('should accept T typed reducers', function () {
type(function () {
var a;
var reduced = a.reduce(function (acc, value) {
value.a = acc.a;
value.b = acc.b;
return acc;
});
reduced.subscribe(function (r) {
r.a.toExponential();
r.b.toLowerCase();
});
});
});
it('should accept T typed reducers when T is an array', function () {
type(function () {
var a;
var reduced = a.reduce(function (acc, value) {
return acc.concat(value);
}, []);
reduced.subscribe(function (rs) {
rs[0].toExponential();
});
});
});
it('should accept R typed reduces when R is an array of T', function () {
type(function () {
var a;
var reduced = a.reduce(function (acc, value) {
acc.push(value);
return acc;
}, []);
reduced.subscribe(function (rs) {
rs[0].toExponential();
});
});
});
it('should accept R typed reducers when R is assignable to T', function () {
type(function () {
var a;
var reduced = a.reduce(function (acc, value) {
value.a = acc.a;
value.b = acc.b;
return acc;
}, {});
reduced.subscribe(function (r) {
r.a.toExponential();
r.b.toLowerCase();
});
});
});
it('should accept R typed reducers when R is not assignable to T', function () {
type(function () {
var a;
var seed = {
as: [1],
bs: ['a']
};
var reduced = a.reduce(function (acc, value) {
acc.as.push(value.a);
acc.bs.push(value.b);
return acc;
}, seed);
reduced.subscribe(function (r) {
r.as[0].toExponential();
r.bs[0].toLowerCase();
});
});
});
it('should accept R typed reducers and reduce to type R', function () {
type(function () {
var a;
var reduced = a.reduce(function (acc, value) {
value.a = acc.a;
value.b = acc.b;
return acc;
}, {});
reduced.subscribe(function (r) {
r.a.toExponential();
r.b.toLowerCase();
});
});
});
it('should accept array of R typed reducers and reduce to array of R', function () {
type(function () {
var a;
var reduced = a.reduce(function (acc, cur) {
console.log(acc);
acc.push(cur.toString());
return acc;
}, []);
reduced.subscribe(function (rs) {
rs[0].toLowerCase();
});
});
});
});
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