An expression is called referentially transparent if it can be replaced with its corresponding value (and vice-versa) without changing the program's behavior.
Avoid side effects
pure function - easier to test
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What is Referential Transparency?
An expression, in a program, may be replaced by its value (or anything having the same value) without changing the result of the program. This implies that methods should always return the same value for a given argument, without having any other effect.
An expression is called referentially transparent if it can be replaced with its corresponding value (and vice-versa) without changing the program's behavior.
An expression is called referentially transparent if it can be replaced with its corresponding value (and vice-versa) without changing the program's behavior.