PHP to SwiftUI

The creation of my iPhone app continues apace, and I’m quite impressed with how much I’ve been learning. It’s taking some time to build the app, but I’m taking everything a step at a time and learning as I go. I don’t just want to throw something together and forget it. I need to LearnNewStuff.

One of today’s many little pieces of new code included a function to turn numbers into words. I’ve no idea if SwiftUI already has a way to do this. Trawling the Internet for answers loses its shine when everything you find is for questions posed 8-12 years ago!

Anyway, to do this little code conversion, I retrieved my old PHP function and converted it into SwiftUI.

PHP:

function number_to_word($number) {
    global $setting;
    $word = $number;
    if($number <= 12) {
        $word = $setting['num_array'][$number];
    }
    if($number > 12 && $number < 20) {
        $word = $setting['num_array'][$number] . "teen";
    }
    if($number >=20 && $number < 100) {
        $first_word = $setting['ten_array'][substr($number,0,1)];
        $second_word = "";
        $second_digit = substr($number,1,1);
        if($second_digit != 0) {
            $second_word = "-" . $setting['num_array'][substr($number,1,1)];
        } 		
        $word = $first_word . $second_word;
    }
    return $word;
}

SwiftUI:

func number2word(number: Int) -> String {
    var word: String = String(number)
    let numArray: [String] = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thir", "for", "fif", "six", "seven", "eight", "nine"]
    let tenArray: [String] = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
    if number <= 12 {
        word = numArray[number]
    }
    if number > 12 && number < 20 {
        word = numArray[number] + "teen"
    }
    if number >= 20 && number < 100 {
        let tenWord = String(String(number).first!)
        let firstWord = tenArray[Int(tenWord) ?? 0]
        var secondWord = ""
        let secondNum = String(String(number).last!)
        if secondNum != "0" && secondNum != "" {
            secondWord = "-" + numArray[Int(secondNum) ?? 0]
        }
        word = firstWord + secondWord
    }    
    return word
}

The main difference between the two pieces of code here is that, in the PHP version, the array is retrieved from data stored in a MariaDB table (I had the site set up so that all variables used in settings for the site were held in a MariaDB table so that I could alter them through the browser instead of changing hard-coded values), but the data in the array is just the same for both pieces of code.

let number = 23
Text(String("\(number2word(number: number))")// Output will be "twenty-three"

The trickiest thing here was to work out how to get the first and last digits of a two-digit number and then convert to the correct type for what SwiftUI is doing at the time. It seems to work, though.

Feeling suitably elated with this minor success, I wondered if I could use the same code but in an extension. I’ve recently learned to use an extension to remove trailing zeros from a Double, but this time I would be writing my own extension based on the above script.

Extension

extension Int {
    var number2word: String {
        var word: String = String(self)
        let numArray: [String] = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thir", "for", "fif", "six", "seven", "eight", "nine"]
        let tenArray: [String] = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
        if self <= 12 {
            word = numArray[self]
        }
        if self > 12 && self < 20 {
            word = numArray[self] + "teen"
        }
        if self >= 20 && self < 100 {
            let tenWord = String(String(self).first!)
            let firstWord = tenArray[Int(tenWord) ?? 0]
            var secondWord = ""
            let secondNum = String(String(self).last!)
            if secondNum != "0" && secondNum != "" {
                secondWord = "-" + numArray[Int(secondNum) ?? 0]
            }
            word = firstWord + secondWord
        }
        return word
    }
}

Now, it’s simply a matter of calling up:

let number = 23
Text(number.number2word)
// Output will be "twenty-three"

I’ll call that a success!

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