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

The correct answer is B. A call to an API does not block the code, but rather it allows application processing to continue E. A callback function typically is used to process the response from an API call. Asynchronous API calls are non-blocking: the application continues executing while waiting for the response (B). When the response eventually arrives, a callback function is invoked to handle it (E). Option A is wrong because async calls do NOT guarantee order of return. Option…

Understanding and Using APIs

Question

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

How the community answered

(36 responses)

A
6% (2)
B
92% (33)
D
3% (1)

Explanation

Asynchronous API calls are non-blocking: the application continues executing while waiting for the response (B). When the response eventually arrives, a callback function is invoked to handle it (E). Option A is wrong because async calls do NOT guarantee order of return. Option C describes synchronous behavior (blocking/latency experienced by the user waiting). Option D describes synchronous calls where code execution blocks until the call returns.

Topics

#Asynchronous API calls#Non-blocking operations#Callback functions#API characteristics

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