Assemblyscript: Converting a number to a string

[trusktr]

I read https://github.com/AssemblyScript/assemblyscript/issues/369, but I'm not sure how to do it.

I have

    assert(s.width === 60, 's.width is not 60, got' + s.width)

and the compiler says

ERROR AS200: Conversion from type 'f64' to '~lib/string/String' requires an explicit cast.

        assert(s.width === 60, 's.width is not 60, got' + s.width)

Is it possible?

[trusktr]

Ok, found a workaround:

    const a = new Array<f64>(1)
    a.push(s.width)
    assert(s.width === 60, 's.width is not 60, got ' + a.toString())

[MaxGraey]

Currently you should explicitly call toString() method

[trusktr]

@MaxGraey Ah, that indeed works, but I got confused by my editor showing an error:

[trusktr]

So I also was trying new Number(s.width), but that constructor doesn't take an argument. Is there some other way to do it without TS having an error?

[MaxGraey]

You could fixed this by adding this to your file:

declare global {
  interface Number {
    toString(): string;
  }
}

@dcodeIO It seems we need wrap our definitions to global namespace

[trusktr]

I tried to put in my code, and got:

ERROR TS1109: Expression expected.

        interface Number {
  ~~~~~~~~~
 in src/as/glas/index.ts(8,1)

[trusktr]

As a workaround, what worked was placing

interface Number {
    toString(): string
}

in a sibling .d.ts file.

[MaxGraey]

Yes,it better place in separate d.ts file

[trusktr]

I'm guessing declare in a .ts file isn't supported yet by the compiler?

[trusktr]

@MaxGraey Hello! Should the toString be added to the standard library types for numbers so users don't have to do it?

[MaxGraey]

I haven't see any problem with master: https://webassembly.studio/?f=7eteo29co4o