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  • Isaac Jaime thinks this is interesting:

Many algorithms in this book are written as methods or functions that return a result. The method's declaration begins with the result's data type. If a method performs some task and doesn't return a result, it has no data type.

From

Cover of Essential Algorithms: A Practical Approach to Computer Algorithms

Note

if a method perfomrs some tasj and doesnt rertun a vlue , it has no data type.