February 2018
Intermediate to advanced
552 pages
13h 46m
English
Content preview from Scala Reactive Programming
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Differences between a Future and a Promise
In Scala, a Future and a Promise have the following differences:
- A Promise is used to compute a value, whereas a Future is used to read that value
- A Promise is used write the value, whereas a Future is a read-only object
- Once a Promise is completed, we cannot change its value, it becomes immutable
- Once a Future is completed, we cannot change its value, it becomes immutable
- A Future is for querying data and a Promise is for writing data
- In simple words, a Future is the getter and a Promise is the setter
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