Type conversion precedence

[WesleyKapow]

I'm trying to be able to do both:

1. Add colors together, e.g. "#F00" + "#0F0" -> "#FF0"
2. Add strings together with a plus operator, e.g. "hello " + user -> "Hello josdejong"

I can get 1 working or 2 working but not both because the string concatenation is taking precedence over the color plus operator. Is there a way to specify which order newly added type operators will be tested/applied? Changing the order they are imported does not seem to have an affect.

Some code:

  const addString = mathjs.typed('add', {
    'string, string': function (a: string, b: string) {
      return a + b
    }
  })
  mathjs.import({ addString })

  mathjs.typed.addType({
    name: 'Color',
    test: function (maybeColor: string) {
      return maybeColor.startsWith("#")
    },
  })

  const addColor = mathjs.typed('add', {
    'Color, Color': function (a: string, b: string) {
      // some logic to add colors, as a test though we could just remove the `#` from the start of the second color.
      return a + b.slice(1)
    }
  })

  mathjs.import({ addColor })

[josdejong]

You'll indeed have to have the type check for Color before testing string, because all colors are also strings. Looking at the API of typed-function, I see the typed.addType function doesn't allow this kind of ordering, but I think you can use typed.addTypes(types, before) where you can specify before as "string".

[WesleyKapow]

After upgrading form version 10.x to 11.x, addTypes worked beautifully, thank you!!