Swift - Variables and ConstantsWhat is wrong with this Swift code?let value value = 5AType inference requires explicit type hereBConstant must be initialized at declarationCVariable name value is invalidDCannot assign Int to a constantCheck Answer
Step-by-Step SolutionSolution:Step 1: Understand let constant rulesConstants declared with let must be assigned a value immediately.Step 2: Identify error in codevalue is declared without initialization, then assigned later, which is invalid.Final Answer:Constant must be initialized at declaration -> Option BQuick Check:let requires immediate initialization [OK]Quick Trick: let constants need value when declared [OK]Common Mistakes:Trying to assign to let after declarationThinking variable name is invalidAssuming type must be explicit here
Master "Variables and Constants" in Swift9 interactive learning modes - each teaches the same concept differentlyLearnWhyDeepVisualTryChallengeProjectRecallTime
More Swift Quizzes Data Types - String is a value type behavior - Quiz 10hard Data Types - Int, Double, Float number types - Quiz 5medium Data Types - Bool type and logical operators - Quiz 12easy Data Types - Why Swift is strongly typed - Quiz 14medium Functions - Variadic parameters - Quiz 11easy Functions - Argument labels and parameter names - Quiz 11easy Operators and Expressions - Comparison operators - Quiz 15hard Optionals - Multiple optional binding - Quiz 2easy Optionals - Optional binding with if let - Quiz 10hard Variables and Constants - Let for constants (immutable) - Quiz 11easy