Solution:Step 1: Await fetchValue inside doubleValueThe doubleValue() function awaits fetchValue() which returns 5.Step 2: Multiply awaited result by 2It returns 5 * 2 = 10 asynchronously.Final Answer:10 -> Option CQuick Check:Await inside async function works = 10 [OK]

[Solved] Given this code:func fetchValue() async -> Int { return 5 } func doubleValue() async -> Int { let val = await fetchValue() return val * 2 }What will doubleValue() return when awaited? | iOS Swift

iOS Swift - Concurrency

Given this code:

func fetchValue() async -> Int {
  return 5
}

func doubleValue() async -> Int {
  let val = await fetchValue()
  return val * 2
}

What will doubleValue() return when awaited?

A5

BError: Cannot await inside async function

C10

D0

Step-by-Step Solution

Solution:

Step 1: Await fetchValue inside doubleValue
The doubleValue() function awaits fetchValue() which returns 5.
Step 2: Multiply awaited result by 2
It returns 5 * 2 = 10 asynchronously.
Final Answer:
10 -> Option C
Quick Check:
Await inside async function works = 10 [OK]

Quick Trick: Async functions can await other async functions [OK]

Common Mistakes:

Thinking await is disallowed inside async functions
Returning original value without multiplication
Confusing return types

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More iOS Swift Quizzes

Given this code:

Step 1: Await fetchValue inside doubleValue

Step 2: Multiply awaited result by 2

Final Answer:

Quick Check:

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