[Solved] You want to write a Swift function formatMessage that takes a text and an optional prefix with default value "Info:".... Which is the correct function and call to get output "Info: Hello"? | Swift

Swift - Functions

You want to write a Swift function formatMessage that takes a text and an optional prefix with default value "Info:". It should return a string combining prefix and text separated by a space. Which is the correct function and call to get output "Info: Hello"?

Afunc formatMessage(text: String, prefix: String = "Info:") -> String { return "\(prefix) \(text)" } print(formatMessage(text: "Hello"))

Bfunc formatMessage(prefix: String = "Info:", text: String) -> String { return "\(text) \(prefix)" } print(formatMessage(text: "Hello"))

Cfunc formatMessage(text: String, prefix: String) -> String { return "\(prefix) \(text)" } print(formatMessage(text: "Hello"))

Dfunc formatMessage(text: String, prefix: String = "Info:") -> String { return "\(text) \(prefix)" } print(formatMessage(text: "Hello"))

Step-by-Step Solution

Solution:

Step 1: Define function with default parameter last
Parameter with default 'prefix' must come after 'text' without default.
Step 2: Check function call and output
Calling with only 'text' uses default prefix "Info:" and returns "Info: Hello".
Final Answer:
func formatMessage(text: String, prefix: String = "Info:") -> String { return "\(prefix) \(text)" } print(formatMessage(text: "Hello")) -> Option A
Quick Check:
Default param last + call with one arg = correct output [OK]

Quick Trick: Default params last, call with missing arg uses default [OK]

Common Mistakes:

Placing default parameter before non-default
Calling function without required parameters
Swapping order of prefix and text in output

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Which is the correct function and call to get output "Info: Hello"?

Step 1: Define function with default parameter last

Step 2: Check function call and output

Final Answer:

Quick Check:

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