CODEWITHSUNDEEP
pythonfunctional-programming
Kiwi
Kiwi

Reputation: 1093

Name for applying list of functions to a value?

Generally you think of applying one function to a list of values, thereby creating a new list (the associated Python function is map). However, what if you apply a list of functions to one value, thereby creating a new value? For example:

allCaps = lambda s: s.upper()
exclaim = lambda s: s + '!'
quote = lambda s: '"' + s + '"'

funcs = [allCaps, exclaim, quote]
value = 'hello'
for f in funcs:
    value = f(value)
print(value) # "HELLO!"

Is there a name for this sort of operation (similar to map, filter, reduce)?

Upvotes: 1

Views: 65

Answers (1)

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 250961

You can use reduce() for this, just pass 'hello' as the initial(reduce(function, sequence[, initial])) value.:

>>> reduce(lambda x, y: y(x), funcs, 'hello')
'"HELLO!"'

Upvotes: 3

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