Hi, why isn't there any operation on Number ? If I...

# javascript

[Ayfri]

Hi, why isn't there any operation on Number ? If I have an external interface having x: Number, y: Number , how would I create an operator function plus, should I convert or unsafeCast<Double> the numbers for every operation I need ? Or add operator functions to Number with unsafeCast<Double> every time ?

[Big Chungus]

Because only in js all number types can be added. Unsafe casting to double in this case is ok, because it will still be a number in js (due to its lack of concrete number types)

[turansky]

If I have an external interface having x: Number, y: Number

Common recommendation for fine external types - don’t use Number type as output (and input where it’s possible)

So answer - fix declarations

[Ayfri]

okay I see, thanks !

[Ayfri]

And for parameters of functions (that are external or not) it's fine I guess ?

[turansky]

Strict type is preferable option in most cases

[turansky]

Single usefull option for Number which I know - “magic” extensions

[turansky]

Like this

[Ayfri]

Ah, I see :o
Is there any documentation about good/bad practises in K/JS IR like that somewhere ?

[turansky]

Do you mean concrete practices?

[Ayfri]

Yes