Swift Basic Programming Exercise: Test if the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere

Swift Basic Programming: Exercise-24 with Solution

Write a Swift program to test if the sequence of numbers 1, 2, 3 appears in a given array of integers somewhere.

Pictorial Presentation:

Sample Solution:

Swift Code:

func array012(_ input: [Int]) -> Bool {
        for (index, number) in input.enumerated() {
        let third_Index = index + 2
        let second_Index = index + 1
        
        if second_Index < input.endIndex && number == 1 && input[second_Index] == 2 && input[third_Index] == 3 {
            return true
        }
    }
    return false
}

print(array012([0, 1, 1, 2, 3, 1]))
print(array012([0, 1, 1, 2, 4, 1]))
print(array012([1, 1, 2, 0, 1, 2, 3]))

Sample Output:

true
false
true

Swift Programming Code Editor:

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