Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

feat(Store): createSelector with an array of selectors (#340) #11

Merged
merged 1 commit into from
Sep 3, 2017
+169 −1
Merged

feat(Store): createSelector with an array of selectors (#340) #11

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
86 changes: 86 additions & 0 deletions modules/store/spec/selector.spec.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,92 @@ describe('Selectors', () => {
});
});

describe('createSelector with arrays', () => {
it('should deliver the value of selectors to the projection function', () => {
const projectFn = jasmine.createSpy('projectionFn');
const selector = createSelector([incrementOne, incrementTwo], projectFn)(
{}
);

expect(projectFn).toHaveBeenCalledWith(countOne, countTwo);
});

it('should be possible to test a projector fn independent from the selectors it is composed of', () => {
const projectFn = jasmine.createSpy('projectionFn');
const selector = createSelector([incrementOne, incrementTwo], projectFn);

selector.projector('', '');

expect(incrementOne).not.toHaveBeenCalled();
expect(incrementTwo).not.toHaveBeenCalled();
expect(projectFn).toHaveBeenCalledWith('', '');
});

it('should call the projector function only when the value of a dependent selector change', () => {
const firstState = { first: 'state', unchanged: 'state' };
const secondState = { second: 'state', unchanged: 'state' };
const neverChangingSelector = jasmine
.createSpy('unchangedSelector')
.and.callFake((state: any) => {
return state.unchanged;
});
const projectFn = jasmine.createSpy('projectionFn');
const selector = createSelector([neverChangingSelector], projectFn);

selector(firstState);
selector(secondState);

expect(projectFn).toHaveBeenCalledTimes(1);
});

it('should memoize the function', () => {
const firstState = { first: 'state' };
const secondState = { second: 'state' };
const projectFn = jasmine.createSpy('projectionFn');
const selector = createSelector(
[incrementOne, incrementTwo, incrementThree],
projectFn
);

selector(firstState);
selector(firstState);
selector(firstState);
selector(secondState);

expect(incrementOne).toHaveBeenCalledTimes(2);
expect(incrementTwo).toHaveBeenCalledTimes(2);
expect(incrementThree).toHaveBeenCalledTimes(2);
expect(projectFn).toHaveBeenCalledTimes(2);
});

it('should allow you to release memoized arguments', () => {
const state = { first: 'state' };
const projectFn = jasmine.createSpy('projectionFn');
const selector = createSelector([incrementOne], projectFn);

selector(state);
selector(state);
selector.release();
selector(state);
selector(state);

expect(projectFn).toHaveBeenCalledTimes(2);
});

it('should recursively release ancestor selectors', () => {
const grandparent = createSelector([incrementOne], a => a);
const parent = createSelector([grandparent], a => a);
const child = createSelector([parent], a => a);
spyOn(grandparent, 'release').and.callThrough();
spyOn(parent, 'release').and.callThrough();

child.release();

expect(grandparent.release).toHaveBeenCalled();
expect(parent.release).toHaveBeenCalled();
});
});

describe('createFeatureSelector', () => {
let featureName = '@ngrx/router-store';
let featureSelector: (state: any) => number;
Expand Down
84 changes: 83 additions & 1 deletion modules/store/src/selector.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -43,24 +43,45 @@ export function createSelector<State, S1, Result>(
s1: Selector<State, S1>,
projector: (S1: S1) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, Result>(
selectors: [Selector<State, S1>],
projector: (s1: S1) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
projector: (s1: S1, s2: S2) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, Result>(
selectors: [Selector<State, S1>, Selector<State, S2>],
projector: (s1: S1, s2: S2) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
s3: Selector<State, S3>,
projector: (s1: S1, s2: S2, s3: S3) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, Result>(
selectors: [Selector<State, S1>, Selector<State, S2>, Selector<State, S3>],
projector: (s1: S1, s2: S2, s3: S3) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
s3: Selector<State, S3>,
s4: Selector<State, S4>,
projector: (s1: S1, s2: S2, s3: S3, s4: S4) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, Result>(
selectors: [
Selector<State, S1>,
Selector<State, S2>,
Selector<State, S3>,
Selector<State, S4>
],
projector: (s1: S1, s2: S2, s3: S3, s4: S4) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
Expand All @@ -69,6 +90,16 @@ export function createSelector<State, S1, S2, S3, S4, S5, Result>(
s5: Selector<State, S5>,
projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, Result>(
selectors: [
Selector<State, S1>,
Selector<State, S2>,
Selector<State, S3>,
Selector<State, S4>,
Selector<State, S5>
],
projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, S6, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
Expand All @@ -78,6 +109,17 @@ export function createSelector<State, S1, S2, S3, S4, S5, S6, Result>(
s6: Selector<State, S6>,
projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, S6, Result>(
selectors: [
Selector<State, S1>,
Selector<State, S2>,
Selector<State, S3>,
Selector<State, S4>,
Selector<State, S5>,
Selector<State, S6>
],
projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, S6, S7, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
Expand All @@ -88,6 +130,18 @@ export function createSelector<State, S1, S2, S3, S4, S5, S6, S7, Result>(
s7: Selector<State, S7>,
projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6, s7: S7) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, S6, S7, Result>(
selectors: [
Selector<State, S1>,
Selector<State, S2>,
Selector<State, S3>,
Selector<State, S4>,
Selector<State, S5>,
Selector<State, S6>,
Selector<State, S7>
],
projector: (s1: S1, s2: S2, s3: S3, s4: S4, s5: S5, s6: S6, s7: S7) => Result
): MemoizedSelector<State, Result>;
export function createSelector<State, S1, S2, S3, S4, S5, S6, S7, S8, Result>(
s1: Selector<State, S1>,
s2: Selector<State, S2>,
Expand All @@ -108,7 +162,35 @@ export function createSelector<State, S1, S2, S3, S4, S5, S6, S7, S8, Result>(
s8: S8
) => Result
): MemoizedSelector<State, Result>;
export function createSelector(...args: any[]): Selector<any, any> {
export function createSelector<State, S1, S2, S3, S4, S5, S6, S7, S8, Result>(
selectors: [
Selector<State, S1>,
Selector<State, S2>,
Selector<State, S3>,
Selector<State, S4>,
Selector<State, S5>,
Selector<State, S6>,
Selector<State, S7>,
Selector<State, S8>
],
projector: (
s1: S1,
s2: S2,
s3: S3,
s4: S4,
s5: S5,
s6: S6,
s7: S7,
s8: S8
) => Result
): MemoizedSelector<State, Result>;
export function createSelector(...input: any[]): Selector<any, any> {
let args = input;
if (Array.isArray(args[0])) {
const [head, ...tail] = args;
args = [...head, ...tail];
}

const selectors = args.slice(0, args.length - 1);
const projector = args[args.length - 1];
const memoizedSelectors = selectors.filter(
Expand Down