350-901 Question #38: Real Exam Question with Answer & Explanation

Question

Which two statements describe the traits of an asynchronous API call? (Choose two.)

Options

• AThe order in which API calls return can be guaranteed
• BA call to an API does not block the code, but rather it allows application processing to continue
• CThe end user can experience latency or performance lag while waiting for the API call to return
• DCode execution blocks or waits for the call to an API to return.
• EA callback function typically is used to process the response from an API call

Explanation

Asynchronous API calls are non-blocking and use callback functions to handle responses, allowing the application to continue executing while waiting.

Common mistakes.

• A. Asynchronous calls do not guarantee return order - responses may arrive in any sequence depending on network latency and server processing time.
• C. Latency while waiting for a response is a characteristic of synchronous calls, where the thread is blocked until the response is received.
• D. Blocking or waiting for a call to return is the defining trait of synchronous API calls, the opposite of asynchronous behavior.

Concept tested. Asynchronous vs synchronous API call behavior

Reference. https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Introducing

No community discussion yet for this question.