Swift Basic Programming Exercise: Check if one of the first 4 elements in a given array of integers is a 7

Swift Basic Programming: Exercise-23 with Solution

Write a Swift program to check if one of the first 4 elements in a given array of integers is a 7. The length of the array may be less than 4.

Pictorial Presentation:

Sample Solution:

Swift Code:

func arrayFront9(_ input: [Int]) -> Bool {
    guard input.count > 3 else {
        return false
    }
    
    if input.prefix(4).contains(7) {
        return true
    }
    return false
}
print(arrayFront9([1, 2, 7, 3, 4]))
print(arrayFront9([1, 2, 3, 4, 7]))
print(arrayFront9([1, 2, 7]))

Sample Output:

true
false
false

Swift Programming Code Editor:

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