We all know to write functions possibly in every language we learn (How?) C,C++,Java,C#,PL/SQL,JavaScript,VBScript,Python etc., There are several different opinions/reasons/views on why use functions. A common notion among most developers are that functions improves reusability (technically speaking it is ability to use in multiple programs) but it is not just that.My introspective view reveals the following (for Why?)
- Readability: Simplifies my program by substituting a complex set of commands (instructions or statements) with English words (call instruction - name of function). Eg: Sum(100,200)
- Reusability: Eliminates repetitive code (redundancy) within the program. Program becomes smaller.
- Testability: Simplifies unit testing.
- Stability: Well unit tested functions leads to a stable program.
- Extensibility: Easier to add new features as the program is now smaller,readable,testable & stable. This apart from the fact whether the new extension uses the existing functions or not.
- Maintainability: Stable & extensible programs are easier to maintain.
- Productivity: Easier maintainable programs increases our (Developer's) productivity.
- Technicality: Information hiding or better execution (say recursive). This is more of When? to write functions.
May be I'll write samples to substantiate this introspection of mine over this week end.
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