Type Inference with numeric literal is insufficient

[gunyarakun]

I want to compile this code without error.

class _Main {
  static function main(args : string[]) : void {
    var a: int = 0;
    var b = 0: int;
    var c: number = 0;
    var d = 0: number;
  }
}

[test.jsx:4:13] expected keyword: ;
    var b = 0: int;
             ^

[test.jsx:6:13] expected keyword: ;
    var d = 0: number;
             ^

[kazuho]

Please use the as operator to cast numeric literals (whith are floating point numbers) to int; e.g. it should be written in either of the following two forms.

var b : int = 0; // assign `0` to a variable of type `int`
var b = 0 as int; // cast `0` to `int` and assign it to variable b (of which type is inferred)

Please also note that int is slower than number on JavaScript since it requires rounding in certain cases.

[gunyarakun]

Thank you for your comment. I'll use 'as'.
And I misunderstood 'int' is faster than 'number' when target is JavaScript.
But 'int' is faster in other targets such like C++, right?

[kazuho]

Yes, if we ever introduce emitter to C++ then int would be faster than number.