[Solved] Identify the error in this Swift code: let items = [] items.append("apple") — Ans: Cannot append to a constant array declared with let. | Swift

Swift - Collections

Identify the error in this Swift code:

let items = []
items.append("apple")

ACannot append to a constant array declared with let.

BArray type cannot be inferred from empty array literal.

CAppending a String to an array of Ints causes error.

DNo error; code runs fine.

Step-by-Step Solution

Solution:

Step 1: Check array declaration and type inference
The array is declared as let items = [] with no type or initial values. Swift cannot guess the type from an empty array literal.
Step 2: Understand why append fails
Because items is declared with let, it is immutable and cannot be appended to. To append, it must be declared with var.
Final Answer:
Cannot append to a constant array declared with let. -> Option A
Quick Check:
let arrays are immutable [OK]

Quick Trick: let arrays cannot be modified after declaration [OK]

Common Mistakes:

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