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Built-in Functions and Lambdas Flashcards

7 cards from real HACKERRANK practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the output of `(lambda a, b: a if a > b else b)(10, 20)`?

    Answer: 20

    The lambda returns the larger of a and b; since 20 > 10, it returns 20.

  2. What does `list(map(str, [1, 2, 3]))` return?

    Answer: ['1', '2', '3']

    map applies str() to each integer, producing a list of string representations.

  3. What does `bool(0)` return?

    Answer: False

    bool() converts 0 to False because 0 is falsy in Python.

  4. Which expression using `reduce` from functools computes the product of [1,2,3,4]?

    Answer: reduce(lambda x, y: x * y, [1,2,3,4])

    reduce applies the multiplication lambda cumulatively: 1*2*3*4 = 24.

  5. What does `type(lambda x: x)` return?

    Answer:

    A lambda expression creates an anonymous function object, so its type is 'function'.

  6. What is the result of `max([1,2,3], key=lambda x: -x)`?

    Answer: 1

    key=lambda x: -x negates each value, so max finds the element with the least negative value, which is 1.

  7. What does `list(zip([1,2,3], [4,5]))` return?

    Answer: [(1,4), (2,5)]

    zip stops at the shortest iterable, so only two pairs are produced.