Hackerrank Built-in Functions and Lambdas 2

Question 1

What does `list(map(lambda x: x ** 2, [1, 2, 3, 4]))` return?

Accepted Answer

[1, 4, 9, 16]

Answer

[2, 4, 6, 8]

Answer

[1, 2, 3, 4]

Answer

[1, 8, 27, 64]

Question 2

Which built-in function returns the largest item in an iterable?

Accepted Answer

max()

Answer

top()

Answer

largest()

Answer

peak()

Question 3

What is the output of `list(filter(lambda x: x % 2 == 0, range(10)))`?

Accepted Answer

[0, 2, 4, 6, 8]

Answer

[1, 3, 5, 7, 9]

Answer

[2, 4, 6, 8, 10]

Answer

[0, 1, 2, 3, 4]

Question 4

What does `abs(-7.5)` return?

Accepted Answer

7.5

Answer

-7.5

Answer

7

Answer

8

Question 5

What is the result of `sorted([3,1,4,1,5], reverse=True)`?

Accepted Answer

[5, 4, 3, 1, 1]

Answer

[1, 1, 3, 4, 5]

Answer

[5, 4, 3, 2, 1]

Answer

[3, 1, 4, 1, 5]

Question 6

Which of the following correctly uses a lambda with `sorted()` to sort by the second element of each tuple?

Accepted Answer

sorted(lst, key=lambda x: x[1])

Answer

sorted(lst, key=lambda x: x[0])

Answer

sorted(lst, lambda x: x[1])

Answer

sorted(lst, func=lambda x: x[1])

Question 7

What does `any([False, False, True, False])` return?

Accepted Answer

True

Answer

False

Answer

None

Answer

1