Which function correctly implements this and allows calling with or without the prefix?
hard📝 Application Q15 of 15
Kotlin - Functions
You want to write a Kotlin function formatMessage that takes a message and an optional prefix with default value "Info:". It should return the combined string. Which function correctly implements this and allows calling with or without the prefix?
Step 1: Define function with default parameter last
The optional parameter prefix with default value should come after the required message parameter.
Step 2: Check each option
fun formatMessage(message: String, prefix: String = "Info:") = "$prefix $message" correctly places prefix last with default. fun formatMessage(prefix: String = "Info:", message: String) = "$prefix $message" places default before required, which can cause call issues. Options C and D lack default for prefix or have wrong order.
Final Answer:
fun formatMessage(message: String, prefix: String = "Info:") = "$prefix $message" -> Option C
Quick Check:
Default last parameter enables optional argument [OK]
Quick Trick:Put default parameters after required ones for easy calls [OK]
Common Mistakes:
MISTAKES
Placing default parameter before required parameter
Not providing default value for optional parameter
Confusing parameter order causing call errors
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