本文整理汇总了TypeScript中rxjs/operator/take.take类的典型用法代码示例。如果您正苦于以下问题：TypeScript take类的具体用法？TypeScript take怎么用？TypeScript take使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了take类的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: FirebaseListFactory
.then(() => {
let query1 = FirebaseListFactory(`questions`, {
query: {
orderByChild: 'data',
endAt: { value: 0 }
}
});
query1 = take.call(query1, 1);
query1 = toPromise.call(query1);
let query2 = FirebaseListFactory(`questions`, {
query: {
orderByChild: 'data',
endAt: { value: 0, key: 'val2' }
}
});
query2 = take.call(query2, 1);
query2 = toPromise.call(query2);
Promise.all([query1, query2]).then(([list1, list2]) => {
expect(list1.map(i => i.$key)).toEqual(['val1', 'val2', 'val3']);
expect(list2.map(i => i.$key)).toEqual(['val1', 'val2']);
done();
});
})示例2:
const initializer = () => {
const app = injector.get<ApplicationRef>(ApplicationRef);
if (!('serviceWorker' in navigator)) {
return;
}
const onStable =
op_filter.call(app.isStable, (stable: boolean) => !!stable) as Observable<boolean>;
const isStable = op_take.call(onStable, 1) as Observable<boolean>;
const whenStable = op_toPromise.call(isStable) as Promise<boolean>;
return whenStable.then(() => navigator.serviceWorker.register(script, options))
.then(() => undefined) as Promise<void>;
};示例3:
const initializer = () => {
const app = injector.get<ApplicationRef>(ApplicationRef);
if (!('serviceWorker' in navigator)) {
return;
}
const onStable =
op_filter.call(app.isStable, (stable: boolean) => !!stable) as Observable<boolean>;
const isStable = op_take.call(onStable, 1) as Observable<boolean>;
const whenStable = op_toPromise.call(isStable) as Promise<boolean>;
// Don't return the Promise, as that will block the application until the SW is registered, and
// cause a crash if the SW registration fails.
whenStable.then(() => navigator.serviceWorker.register(script, options));
};示例4: FirebaseListFactory
.then(() => {
let query1 = FirebaseListFactory(app.database().ref(`questions`), {
query: {
orderByChild: 'data',
equalTo: { value: 0 }
}
});
let promise1 = toPromise.call(take.call(query1, 1));
let query2 = FirebaseListFactory(app.database().ref(`questions`), {
query: {
orderByChild: 'data',
equalTo: { value: 0, key: 'val2' }
}
});
let promise2 = toPromise.call(take.call(query2, 1));
Promise.all([promise1, promise2]).then(([list1, list2]) => {
expect(list1.map(i => i.$key)).toEqual(['val1', 'val2', 'val3']);
expect(list2.map(i => i.$key)).toEqual(['val2']);
done();
});
})示例5: it
it('should re-emit identical instances of unchanged children as snapshots', (done: any) => {
let prev;
take.call(questionsSnapshotted, 2).subscribe(
(list) => {
if (prev) {
expect(list[0]).toBe(prev[0]);
done();
} else {
prev = list;
questionsSnapshotted.push({ name: 'bob' });
}
},
done.fail
);
questionsSnapshotted.push({ name: 'alice' });
});示例6:
const initializer = () => {
const app = injector.get<ApplicationRef>(ApplicationRef);
if (!(isPlatformBrowser(platformId) && ('serviceWorker' in navigator) &&
options.enabled !== false)) {
return;
}
const onStable =
op_filter.call(app.isStable, (stable: boolean) => !!stable) as Observable<boolean>;
const isStable = op_take.call(onStable, 1) as Observable<boolean>;
const whenStable = op_toPromise.call(isStable) as Promise<boolean>;
// Wait for service worker controller changes, and fire an INITIALIZE action when a new SW
// becomes active. This allows the SW to initialize itself even if there is no application
// traffic.
navigator.serviceWorker.addEventListener('controllerchange', () => {
if (navigator.serviceWorker.controller !== null) {
navigator.serviceWorker.controller.postMessage({action: 'INITIALIZE'});
}
});
// Don't return the Promise, as that will block the application until the SW is registered, and
// cause a crash if the SW registration fails.
whenStable.then(() => navigator.serviceWorker.register(script, {scope: options.scope}));
};示例7:
function skipAndTake<T>(obs: Observable<T>, takeCount: number = 1, skipCount: number = 0) {
return take.call(skip.call(obs, skipCount), takeCount);
}示例8:
function obsToSinglePromise<T>(obs: Observable<T>): Promise<T> {
const takeOne = take.call(obs, 1);
return toPromise.call(takeOne);
}