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- prototype and patch:
- A development plan that involves writing a rough draft of a program, testing, and correcting errors as they are found.
- planned development:
- A development plan that involves high-level insight into the problem and more planning than incremental development or prototype development.
- pure function:
- A function that does not modify any of the objects it receives as arguments. Most pure functions are fruitful.
- A function that changes one or more of the objects it receives as arguments. Most modifiers are fruitless.
- functional programming style:
- A style of program design in which the majority of functions are pure.
- A condition that should always be true during the execution of a program.