tap()
Perform side effects without changing the result.
Syntax
typescript
task.tap(fn: (value: T) => void | Promise<void>): FuturableTask<T>Parameters
fn
Function to execute for side effects. Return value is ignored.
Return Value
A new FuturableTask<T> with the same result value.
Examples
Logging
typescript
const task = FuturableTask
.of(() => fetchData())
.tap(data => console.log('Received:', data))
.map(data => processData(data));Progress Tracking
typescript
const task = FuturableTask
.of(() => readFile())
.tap(() => updateProgress(33))
.map(data => parseData(data))
.tap(() => updateProgress(66))
.map(parsed => transformData(parsed))
.tap(() => updateProgress(100));Caching
typescript
const task = FuturableTask
.fetch('/api/data')
.map(res => res.json())
.tap(data => cache.set('key', data))
.map(data => data.items);Analytics
typescript
const task = FuturableTask
.of(() => performAction())
.tap(result => analytics.track('action_completed', result));