Swift - Variables and Constants
You want to track a user's score that changes during gameplay. Which Swift code snippet correctly declares and updates this score?
You want to track a user's score that changes during gameplay. Which Swift code snippet correctly declares and updates this score?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Mutable variable declaration
Usevarto declarescoreso it can be changed.Step 2: Update score correctly
score += 5increments the score by 5.Step 3: Identify incorrect options
- let score = 0
score = score + 5 uses
let, which is immutable. - score var = 0 score = 5 has invalid syntax.
- var score: String = "0" score = 5 declares score as String but assigns Int later, causing type error.
- let score = 0
score = score + 5 uses
Final Answer:
var score = 0 score += 5 -> Option DQuick Check:
Use var for mutable variables and proper type [OK]
Quick Trick: Declare with var and update with += for mutable values [OK]
Common Mistakes:
- Using let for variables that change
- Incorrect syntax for variable declaration
- Type mismatch between declared and assigned values
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