[Solved] What will be printed by this Swift code?let x: String? = nil let y: String? = "Hello" let z = x ?? (y ?? "Default") print(z) | Swift

Swift - Operators and Expressions

What will be printed by this Swift code?

let x: String? = nil
let y: String? = "Hello"
let z = x ?? (y ?? "Default")
print(z)

A"Hello"

B"Default"

Cnil

DOptional("Hello")

Step-by-Step Solution

Solution:

Step 1: Evaluate first nil coalescing
x is nil, so x ?? (y ?? "Default") evaluates to y ?? "Default".
Step 2: Evaluate second nil coalescing
Since y is not nil, y ?? "Default" unwraps y to "Hello".
Final Answer:
"Hello" -> Option A
Quick Check:
Chained ?? unwraps first non-nil string = C [OK]

Quick Trick: ?? unwraps optionals in order until non-nil found [OK]

Common Mistakes:

Master "Operators and Expressions" in Swift

9 interactive learning modes - each teaches the same concept differently

More Swift Quizzes

What will be printed by this Swift code?