October 2018
Intermediate to advanced
420 pages
10h 26m
English
Content preview from Hands-On Reactive Programming with Python
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Side effects and pure functions
Another concept that is important to understand is a side effect. A function has a side effect if it interacts with an external mutable state. A state in this definition can be any kind of store (such as a global variable) or an entity that is accessed via I/O operations (such as a database or a network connection). Side effects exist in several ways:
- A function without an input parameter is a side effect because its action depends on information that has not been provided as an input
- A function without an output parameter is a side effect because it means that it interacted with some external state
- A function that operates on I/O is a side effect because its result depends on an external state, which is either ...
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