RogerBW's Blog

The Weekly Challenge 179: Spark and Spell 25 August 2022

I’ve been doing the Weekly Challenges. The latest involved ordinal numbers and Unicode generation. (Note that this is open until 28 August 2022.)

Task 1: Ordinal Number Spelling

You are given a positive number, $n.

Write a script to spell the ordinal number.

While it's trivial for the two-digit examples given, doing this properly is quite hard work, and I didn't feel like putting in that effort across multiple languages. And doing it in Perl and Raku is a solved problem, thanks to Lingua::EN::Numbers (a different module with a slightly different interface in each language). So I used that, and abandoned the others. If I had to do this elsewhere, I'd probably port the Perl code – or of course look up the Rosetta Code page.

Raku:

use Lingua::EN::Numbers;

is(ordinal(11),"eleventh",'example 1');

and in Perl similarly

use Lingua::EN::Numbers qw(num2en_ordinal);

is(num2en_ordinal(11),"eleventh",'example 1');

Task 2: Unicode Sparkline

You are given a list of positive numbers, @n.

Write a script to print sparkline in Unicode for the given list of numbers.

A "sparkline" is apparently a low-resolution graph that's built up from line-drawing characters. In Unicode, we have U+2581 LOWER ONE EIGHTH BLOCK to U+2588 FULL BLOCK.

PostScript, of course, doesn't support UTF-8 at all… but in a UTF-8 console, it can be made to emit the right multibyte sequences, UTF-8-encoded in advance. (As with all the languages, I build up bar as an array of bar characters, then concatenate the right ones out of that array.)

/sparkline {
    9 dict begin
    /nn exch def
    /bar 8 array def
    0 1 7 {
        /i exch def
        /cc 3 string def
        cc 0 16#e2 put
        cc 1 16#96 put
        cc 2 16#81 i add put
        bar i cc put
    } for
    /mn nn listmin def
    /mx nn listmax def
    /inscale mx mn sub def
    /outscale bar length def
    /out nn length 3 mul string def
    0 1 nn length 1 sub {
        /i exch def
        out i 3 mul
        bar nn i get mn sub inscale div outscale mul cvi outscale 1 sub min get
        putinterval
    } for
    out
    end
} bind def

In JavaScript, String.fromCharCode() only works for UCS-2 (i.e. the 16-bit Basic Multilingual Plane), but the characters used here are in that span so I can get away with it.

function sparkline(nn) {
    let bar = [];
    for (let bc = 9601; bc <= 9608; bc++) {
        bar.push(String.fromCharCode(bc));
    }
    let mn = Math.min(...nn);
    let mx = Math.max(...nn);
    let inscale = mx - mn;
    let outscale = bar.length;
    let out = "";
    for (let v of nn) {
        let va = Math.min(Math.floor((v - mn) / inscale * outscale),
                          outscale - 1);
        out += bar[va];
    }
    return out;
}

Same in Kotlin, which similarly has 16-bit Char types. But most of these languages don't have a problem with Unicode and UTF-8 now, at least as long as nobody's asking them actually to understand it (e.g. to split a string into characters).

Full code on github.

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