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A library trying to clone the Haskell-Prelude for python3

Project description

Cloning the Haskell-Prelude for Python3 :



The newType function

Just, Nothing = newType('Maybe', ('Just', 1), ('Nothing', 0), deriving={Eq, Show})

constructor matching

def isJust(x):
    return Just(match=x)

def isNothing(x):
    return x==Nothing


def mapB(func, b):
    return b

T, F = newType("B", ("T",0), ("F",0), deriving={Eq, Show}, implements={Functor : {"fmap" : mapB} })

print(fmap(lambda x: x*2, T)) # 'T()'


# Application operator $ as |

def f(x):
    return x

print( f | (lambda x: x*3) | (lambda x: x+1) | 2) #9

# Function composition . as *

g = (lambda x: x*3) * f * (lambda x: x+1) * (lambda x: x+1)

print(g(2)) #8

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