[Solved] What is the issue with this Swift code snippet?var data = [] data.append(10) — Ans: The array 'data' has no type specified, so Swift cannot infer the element type. | Swift

Swift - Collections

What is the issue with this Swift code snippet?

var data = []
data.append(10)

AThe append method is not available for arrays in Swift.

BYou cannot append elements to a variable declared with 'var'.

CThe array 'data' has no type specified, so Swift cannot infer the element type.

DThe array must be declared with 'let' to allow appending.

Step-by-Step Solution

Solution:

Step 1: Analyze the declaration
The array 'data' is declared as an empty array with no type annotation, so Swift cannot infer its element type.
Step 2: Understand type inference rules
Swift requires either explicit type annotation or initial elements to infer the array's type.
Step 3: Identify the error
Since 'data' has no type, calling 'append(10)' causes a compile-time error.
Final Answer:
The array 'data' has no type specified, so Swift cannot infer the element type. -> Option C
Quick Check:
Empty array without type annotation cannot infer element type [OK]

Quick Trick: Empty arrays need explicit type for appending [OK]

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