[Pas2js] Pas2js 0.9.20

[Michael Van Canneyt]

On Sat, 12 May 2018, Ryan Joseph wrote:

>
>
>> On May 12, 2018, at 2:43 PM, Michael Van Canneyt <michael at freepascal.org> wrote:
>> 
>> Hence my proposal to add overloads
>> _set (arr : Array of BaseType);
>> _set (arr : Array of BaseType; aOffset :NativeInt);
>> to each descendant.
>
> That would help and be nice but lots of working making overloads though
> and it’s possible we’re enforcing type safety where there shouldn’t be. 
> You may very well be able to pass an array of ints to a Float32Array for
> example.

Maybe, but the result may not be what you expect or what you would expect if
it were pascal buffers.

a=new Uint8Array(3);
Uint8Array [ 0, 0, 0 ]
a.set([412,412,415])
undefined
console.log(a);
Uint8Array [ 156, 156, 159 ]

I would expect an error since the values are out of range. what happened
instead is that values were cut, presumably by taking the low byte of a
word-sized or integer-sized value.

So, forcing people to do a typecast to make them aware of this seems like a
good idea.

In short:
- One can use a typed array. 
- One can use an array of the declared basetype
For all other cases, you must make a typecast.

Michael.