[Solved] Identify the error in this Swift code snippet:var set: Set = [1, 2, 3] set.append(4) — Ans: Set does not have append method | iOS Swift

iOS Swift - Swift Language Essentials

Identify the error in this Swift code snippet:

var set: Set = [1, 2, 3]
set.append(4)

AMissing type annotation for set

BSet does not have append method

CSet cannot contain integers

DSet must be immutable

Step-by-Step Solution

Solution:

Step 1: Recall Set methods in Swift
Set uses insert() to add elements, not append().
Step 2: Identify method error
append() is for arrays; calling it on Set causes error.
Final Answer:
Set does not have append method -> Option B
Quick Check:
Use insert() to add to Set [OK]

Quick Trick: Use insert() to add elements to Set [OK]

Common Mistakes:

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