Converting Temperatures without using deg and using ºC or C

[MrAmericanMike]

Would it be possible to use the evaluate("30ºC to ºF") instead of having to do evaluate("30degC to degF")

Is this some kind of limitation?

[josdejong]

You can override the math.parse.isAlpha function with a wrapper that also accepts the degree character º or ° as valid character. After that you can define a new unit like math.createUnit('º', '1 deg').

EDIT: you also have to update math.Unit.isValidAlpha (see comments below).

[MrAmericanMike]

Thanks, will give that a try.

[MrAmericanMike]

I'm probably doing the overwrite portion wrong, not sure, but I get an error when trying:

import * as math from "mathjs";

math.parse.isAlpha = function (char, charPrev, charNext) {
	return /^[a-zA-Zº°]$/.test(char);
};

console.log(math.parse.isAlpha("º"));

math.createUnit("º", "1 deg");

The console.log comes as true, but the console then errors with:

file:///F:/VSCode/Code/TESTS/MathJS/node_modules/.pnpm/[email protected]/node_modules/mathjs/lib/esm/type/unit/Unit.js:3679
        throw new Error('Invalid unit name (must begin with alpha character): "' + name + '"');
              ^

Error: Invalid unit name (must begin with alpha character): "º"
    at assertUnitNameIsValid (file:///F:/VSCode/Code/TESTS/MathJS/node_modules/.pnpm/[email protected]/node_modules/mathjs/lib/esm/type/unit/Unit.js:3679:15)   
    at Unit.createUnitSingle (file:///F:/VSCode/Code/TESTS/MathJS/node_modules/.pnpm/[email protected]/node_modules/mathjs/lib/esm/type/unit/Unit.js:3772:5)    
    at Unit.createUnit (file:///F:/VSCode/Code/TESTS/MathJS/node_modules/.pnpm/[email protected]/node_modules/mathjs/lib/esm/type/unit/Unit.js:3728:25)
    at Module.stringUnitStringObject (file:///F:/VSCode/Code/TESTS/MathJS/node_modules/.pnpm/[email protected]/node_modules/mathjs/lib/esm/type/unit/function/createUnit.js:70:19)
    at Module.createUnit (F:\VSCode\Code\TESTS\MathJS\node_modules\.pnpm\[email protected]\node_modules\typed-function\lib\umd\typed-function.js:1468:22)    at file:///F:/VSCode/Code/TESTS/MathJS/src/main.js:9:6

[josdejong]

Oow, good point. Unit has it's own function to check what a valid alpha is, you have to override that too: math.Unit.isValidAlpha.