| id | lesson | compare | mainCompare | image | learnAbout | learnBackAbout | title | layout | class | preview_image | preview_image_alt | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
takeLast |
31 |
|
take |
takeLast/takeLast-take.png |
delay |
skipWhile |
Reactive Programming - take vs takeLast |
default |
post |
takeLast/content_preview.jpg |
The "takeLast" operator |
Learn more about stream completion.
Use a ▬ number on these cards, such as 3, to set a maximum amount of events to emit. ❚ take and ❚ takeLast share identical behavior:
- they both return a new stream of at most amount values.
- if the input stream source emits fewer than amount values then all of its values are emitted on the output stream.
The stream returned by ❚ take emits the values at the same time as their counterpart on the input stream. This is not the case for ❚ takeLast. Remember: a stream is a sequence of events over time. And we can't see the future! takeLast must wait for the ◉ complete notification. Only then, we know what are the last values.
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