October 2018
Intermediate to advanced
420 pages
10h 26m
English
Content preview from Hands-On Reactive Programming with Python
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Chapter 13
Explain why side-effects must be as small as possible (in terms of code size).
In principle, side-effects should contain only the part of code that is a side-effect. However, when using existing libraries, the side-effect part often contains additional logic. This means that more code has to be tested, probably by using mocks. Since testing side-effects is more difficult than testing pure code, they should be stripped to the bare minimum.
What is the advantage of a protocol implemented without I/O?
A protocol implemented without I/O can be implemented only as pure code. As a consequence, such an implementation can be tested more easily and it can be reused on top of transport layers other than the original one intended.
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