Swift - Functions
You want to write a Swift function that calculates the total price including tax. The tax rate should default to 5%. How would you declare this function?
You want to write a Swift function that calculates the total price including tax. The tax rate should default to 5%. How would you declare this function?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct default parameter usage
Tax rate should have a default of 0.05 (5%) and come after required parameters.Step 2: Check each option
func totalPrice(amount: Double, taxRate: Double = 0.05) -> Double { return amount * (1 + taxRate) } correctly sets taxRate default to 0.05 and places it after amount.Final Answer:
func totalPrice(amount: Double, taxRate: Double = 0.05) -> Double { return amount * (1 + taxRate) } -> Option BQuick Check:
Default tax rate = 0.05 correctly set [OK]
Quick Trick: Default tax rate as decimal, parameter order matters [OK]
Common Mistakes:
- Setting default on wrong parameter
- Using 5 instead of 0.05
- Ignoring parameter order
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