[Solved] What will be the output of this Swift code?func multiplyByTwo(_ number: Int) -> Int { return number * 2 } let operation = multiplyByTwo print(operation(5)) | Swift

Swift - Functions

What will be the output of this Swift code?

func multiplyByTwo(_ number: Int) -> Int {
    return number * 2
}

let operation = multiplyByTwo
print(operation(5))

A5

BmultiplyByTwo

C10

DError: Cannot assign function to variable

Step-by-Step Solution

Solution:

Step 1: Understand function assignment and call
The function multiplyByTwo is assigned to 'operation' without calling it, so 'operation' is a function reference.
Step 2: Call the function through the variable
Calling operation(5) runs multiplyByTwo(5), which returns 5 * 2 = 10.
Final Answer:
10 -> Option C
Quick Check:
Function call via variable returns 10 [OK]

Quick Trick: Calling assigned function runs original logic [OK]

Common Mistakes:

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