CodeSignal Technical Assessment Domain-Specific Knowledges 5

Question 1

In object-oriented programming, what is the difference between composition and inheritance?

Accepted Answer

Composition models 'has-a' relationships by embedding objects; inheritance models 'is-a' relationships via subclassing

Answer

Composition delegates behavior to contained objects (has-a), while inheritance acquires behavior from a parent class (is-a), and composition is generally preferred for flexibility.

Question 2

Which tree traversal visits nodes in ascending order for a Binary Search Tree?

Accepted Answer

In-order (left, root, right)

Answer

In-order traversal of a BST visits the left subtree, then the root, then the right subtree, yielding keys in sorted ascending order.

Question 3

Which HTTP caching header tells the browser the maximum number of seconds a response may be cached before revalidation?

Accepted Answer

Cache-Control: max-age

Answer

Cache-Control: max-age=N directs caches to consider the response fresh for N seconds from the time it was received.

Question 4

What is the output of `print(0.1 + 0.2 == 0.3)` in Python?

Accepted Answer

False

Answer

IEEE 754 floating-point representation cannot exactly represent 0.1 or 0.2, so their sum slightly exceeds 0.3, making the equality check False.

Question 5

In software testing, what does 'code coverage' measure?

Accepted Answer

The percentage of source code lines or branches exercised by a test suite

Answer

Code coverage reports which lines, branches, or paths are executed during tests, helping identify untested portions of the codebase.

Codesignal Practice Test

Codesignal Practice Test

CodeSignal Technical Assessment Domain-Specific Knowledges 5