haskellian 0.3.3

The functional programming library you need

Haskellian

The functional programming library you need

pip install haskellian

Why

• Lazy imports + stub files -> great linting and 0 import time
• Monadic, method chaining style
• Great typing and overloads

from haskellian import either as E, iter as I, promise as P, Pipe, asyn_iter as AI

Pipe[A] (simplest monad ever)

Pipe('world hello') \
.f(str.title) \
.f(lambda s: s.split(' ')) \
.f(sorted) \
.f(', '.join) \
.value
# 'Hello, World'

Iter[A] (generators made ergonomic)

I.Iter(range(100000000000)) \
.map(lambda x: 2*x) \
.filter(lambda x: x % 2 == 0) \
.batch(2) \
.tail()
#.sync() # don't recommend it...

# Iter([(4, 6), (8, 10), (12, 14), (16, 18), (20, 22), ...])

Promise[A] (awaitables made ergonomic)

async def fetch_users() -> list[str]:
  ...
async def fetch_user(id) -> str:
  ...

await P.Promise(fetch_users()) \
.bind(lambda ids: P.all(map(fetch_user, ids))) \
.then(sorted)

AsyncIter[A], Either[L, R] (self-explanatory at this point, right?)