You want to create a dictionary where keys are strings and values are functions that take an Int and return a Bool. Which declaration is correct?

hard📝 Application Q8 of 15

Swift - Functions

Avar dict: [String: (Int) -> Bool]

Bvar dict: (String) -> [Int: Bool]

Cvar dict: [Int: (String) -> Bool]

Dvar dict: [String: Bool -> Int]

Step-by-Step Solution

Solution:

Step 1: Understand dictionary key-value types
Keys are String, values are functions from Int to Bool.
Step 2: Match dictionary syntax
Dictionary type is [KeyType: ValueType], so [String: (Int) -> Bool] is correct.
Final Answer:
var dict: [String: (Int) -> Bool] -> Option A
Quick Check:
Dictionary with function values = [String: (Int) -> Bool] [OK]

Quick Trick: Dictionary values can be function types like any other type [OK]

Common Mistakes:

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