NEW GUIDE: Currying in CircuitPython #CircuitPython #Python #AdafruitLearningSystem @Adafruit @DAstels

A new guide today in the Adafruit Learning System: Currying in CircuitPython

If you happen to have at least dabbled with the programming language Haskell, or one similar, you may be familiar with currying, aka partially applied functions. Partial function application is an important mechanic in functional programming. Functional programming is a hot topic these days: many of its core features are showing up in other languages, including Python.

A partially applied function is a function that has been given some arguments, but not all. In Haskell you might see a function declaration such as:

add    :: Integer -> Integer -> Integer
add x y =  x + y

Our traditional understanding of functions would lead us to believe that this declares a function add which takes two integer arguments and returns an integer result which is the sum of the arguments.  We would be wrong. This, in fact, declares a function that takes an integer and returns another function that takes an integer and returns one. I.e.

add:: Integer -> (Integer -> Integer)

When add is called, it returns a function that has been partially applied (to the first argument). The resulting function can then be applied to the second (and final) argument to generate a result.

Normally, we’d call add with both parameters:

Prelude> add 2 3
5

but because of being able to partially apply functions, we can call add with one parameter and get a function back. For example:

Prelude> inc = add 1
Prelude> :t inc
inc :: Num a => a -> a

inc is a function that takes an number and returns the number plus one. (:t tells you the type of its argument) That function is essentially:

inc y = 1 + y

So now we can use inc:

Prelude> inc 2
3

This is called currying in honor of Haskell Curry, after whom the Haskell language is also named.

This is just how things work in Haskell, but Python gives us the tools we need to do it there as well.

See this full guide here.


8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

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CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


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