You want to declare a Swift function named describePerson that takes a String parameter name and an Int parameter age, and returns a String describing the person like "Name is Age years old." Which is the correct function declaration?
hard📝 Application Q15 of 15
Swift - Functions
You want to declare a Swift function named describePerson that takes a String parameter name and an Int parameter age, and returns a String describing the person like "Name is Age years old." Which is the correct function declaration?
Afunc describePerson(name: String, age: Int) -> String {
return "\(name) is \(age) years old."
}
Bfunc describePerson(name String, age Int) -> String {
return "\(name) is \(age) years old."
}
Cfunc describePerson(name: String, age: Int) {
print("\(name) is \(age) years old.")
}
Dfunc describePerson(name: String, age: Int) -> Void {
return "\(name) is \(age) years old."
}
Step-by-Step Solution
Solution:
Step 1: Check parameter syntax and return type
Parameters must have colons between name and type. The function returns a String, so return type must be String.
Step 2: Verify function body matches return type
func describePerson(name: String, age: Int) -> String {
return "\(name) is \(age) years old."
} returns a String with correct string interpolation. func describePerson(name String, age Int) -> String {
return "\(name) is \(age) years old."
} misses colons. func describePerson(name: String, age: Int) {
print("\(name) is \(age) years old.")
} has no return type and uses print instead of return. func describePerson(name: String, age: Int) -> Void {
return "\(name) is \(age) years old."
} uses Void return type but returns a String, which is invalid.
Final Answer:
func describePerson(name: String, age: Int) -> String {
return "\(name) is \(age) years old."
} -> Option A
Quick Check:
Correct parameters and return type with string interpolation [OK]
Quick Trick:Use colons for parameters and match return type with returned value [OK]
Common Mistakes:
Omitting colons in parameters
Using print instead of return for returning values
Mismatching return type and returned value
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