String to Decimal ASCII value

String+ASCII.swift

import Foundation

// Converting a letter to decimal

// Manual form
let lowercaseA: UInt8? = Character("a").asciiValue
print("decimal ascii: \(lowercaseA)")
// OUTPUT 
// decimal ascii: 97

let uppercaseA: UInt8? = Character("a").asciiValue
print("decimal ascii: \(uppercaseA)")
// OUTPUT 
// decimal ascii: 65

// Using an extension
extension String {
    var asciiValue: UInt8? { Character(self).asciiValue }
}

let lowercaseA2 = "a".asciiValue
print("decimal ascii: \(lowercaseA2)")
// OUTPUT 
// decimal ascii: 97

// Converting a Phrase to a Decimal Array
extension StringProtocol {
    var asciiValues: [UInt8] { compactMap(\.asciiValue) }
}

let decimalArray = "joao vitor".asciiValues
print("decimal ascii array: \(decimalArray)")
// OUTPUT 
// decimal ascii array: [106, 111, 97, 111, 32, 118, 105, 116, 111, 114]