[Solved] Identify the error in this Swift code for empty state handling: var data: [String]? if data.isEmpty { print("No data") } | iOS Swift

iOS Swift - Lists and Data Display

Identify the error in this Swift code for empty state handling:

var data: [String]?
if data.isEmpty {
  print("No data")
}

AUsing var instead of let causes error

Bdata is optional, so isEmpty cannot be called directly

CMissing else block for non-empty data

DNo error, code is correct

Step-by-Step Solution

Solution:

Step 1: Analyze variable type
Variable data is an optional array ([String]?), meaning it can be nil.
Step 2: Check method call on optional
You cannot call isEmpty directly on an optional without unwrapping it first.
Final Answer:
data is optional, so isEmpty cannot be called directly -> Option B
Quick Check:
Optional must be unwrapped before isEmpty [OK]

Quick Trick: Optional arrays need unwrapping before isEmpty [OK]

Common Mistakes:

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