Advantages
The advantage for implementation is that if a software module has a single purpose, it will be simpler, and therefore easier and less expensive, to design and implement.
Systems with functionally designed parts are easier to modify because each part does only what it claims to do.
Since maintenance is more than 3/4 of a successful system's life, this feature is a crucial advantage. It also makes the system easier to understand and document, which simplifies training. The result is that the practical lifetime of a functional system is longer.
In a system of programs, a functional module will be easier to reuse because it is less likely to have side effects that appear in other parts of the system.
Read more about this topic: Functional Design
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