Functional Programming explained to my grandma

Anne-Honyme
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Currying

Currying is one of the words you will hear the most when you start to work with functional programming. It is also one of the hardest to figure out.

  • Definition: Currying is the technique of translating the evaluation of a function which takes multiple arguments into evaluating a sequence of functions, each with a single argument *

We can see currying as a series of partial application.

For a function who has N parameters, a partial application will have N-X. It improves code readability by binding some parameters and giving names to specific uses.

Implement the area computation

Now we have seen what is partial application, we can introduce currying as a series of partial application, where at each step we only apply one parameter.

Example

Implement the multiply and multiplyByTwo
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