January 2020
Intermediate to advanced
470 pages
11h 13m
English
Content preview from Mastering JavaScript Functional Programming - Second Edition
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Going the straightforward JavaScript way
One of the biggest causes of side effects was the possibility of a function modifying global objects or its arguments. All non-primitive objects are passed as references, so if/when you modify them, the original objects will be changed. If we want to stop this (without just depending on the goodwill and clean coding of our developers), we may want to consider some straightforward JavaScript techniques to disallow those side effects:
- Avoiding mutator functions that directly modify the object that they are applied to
- Using const declarations to prevent variables from being changed
- Freezing objects so that they can't be modified in any way
- Creating (changed) clones of objects to avoid modifying the original ...
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