Advanced FP Patterns

Preview — 3 of 10 questions

What is the output of the following code?

javascript

factorial = (lambda f: lambda n: f(f, n))(
    lambda f, n: 1 if n == 0 else n * f(f, n - 1)
)
print(factorial(5))

BTypeError: <lambda>() missing 1 required positional argument

C120

DRecursionError

What is the output of the following code?

javascript

from functools import singledispatch

@singledispatch
def describe(value):
    return f"generic: {value}"

@describe.register
def _(value: int):
    return f"integer: {value}"

@describe.register
def _(value: str):
    return f"string: {value}"

print(describe(42))
print(describe("hi"))
print(describe(3.14))

ATypeError: describe() takes 1 positional argument

Binteger: 42, string: hi, generic: 3.14

Cinteger: 42, integer: hi, integer: 3.14

Dgeneric: 42, generic: hi, generic: 3.14

What is the output of the following code?

javascript

from itertools import groupby

data = [1, 1, 2, 2, 1, 3]
sorted_data = sorted(data)
grouped = {key: list(group) for key, group in groupby(sorted_data)}
print(grouped)

A{1: [1], 2: [2, 2], 3: [3]}

B{1: [1, 1], 2: [2, 2], 3: [3]}

CKeyError

D{1: [1, 1, 1], 2: [2, 2], 3: [3]}

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