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Monad m => m a -> (a -> m b) -> m b
foldr :: (a -> b -> b) -> b -> [a] -> b

haskeller.net

Pure functions in a darkened theater.

A cinematic descent through lambda architecture, graph reduction, lazy time, and proofs that execute.

Where purity meets computation.

01

Referential transparency as architecture.

Every expression is a room whose walls never shift. Substitute equals for equals and the entire structure remains still, precise, inevitable.

CODE
λ

Functions compose.

No ceremony. No mutation. Only arrows finding their destination.

Types are theorems. Programs are proofs.

fmap :: Functor f => (a -> b) -> f a -> f b

Algebraic data types carve light from the void.

Sum and product types become cinematic geometry: choices, containers, guarantees. The compiler reads their silhouettes before a program ever runs.

::

Pattern matching is editing.

Each case cuts to the only possible scene.

Graph reduction in slow motion.

Laziness as a virtue.

Evaluation waits like a held breath.

Computation does not hurry. Infinite lists become landscapes beyond the horizon, only illuminated when the projector needs the next frame.

>>=

Effects contained, not denied.

IO is not chaos. It is a boundary drawn in electric teal, a type-level aperture between pure proof and the moving world.

main :: IO ()

Abstraction becomes atmosphere.

Higher-order functions drift through the grid like fog.

The scroll is the projector.