To design Functions :
1. Signature, purpose, stub.
2. Define examples, wrap each in check-expect.
3. Template and inventory.
4. Code function and body.
5. Test and debug till done.
signature : type of each arg, separated by spaces, followed by -> type of result.
purpose - a meaningful one line statement.
stub : syntactically complete function definition that produces a value of the right ype. This makes it possible to run examples even before the function design is complete..
You ain't got UBC under your thumbnail for nothin bro.
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