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

map applies the lambda squaring function to each element, producing [1, 4, 9, 16].

Question 2

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

Accepted Answer

max()

Answer

max() returns the largest item from an iterable or the largest of two or more arguments.

Question 3

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

Accepted Answer

[0, 2, 4, 6, 8]

Answer

filter keeps elements where the lambda returns True, selecting even numbers 0 through 8.

Question 4

What does `abs(-7.5)` return?

Accepted Answer

7.5

Answer

abs() returns the absolute value of a number, converting -7.5 to 7.5.

Question 5

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

Accepted Answer

[5, 4, 3, 1, 1]

Answer

sorted() with reverse=True returns a new list sorted in descending order.

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