Question about ints in Dart (bit size)

[Si Robertson]

Hi guys,

What is the bit size of ints in Dart?

The reason I ask is because of this ...

  int a = 0xFFFFFFFF;

  int b = 255 << 24 | 255 << 16 | 255 << 8 | 255;

  print(a); // 4294967295

  print(b); // 4294967295

  print(a.runtimeType); // int

Normally I would expect those values to wrap around to -1 (32-bit signed integer) which is why the behaviour here caught me off guard. Is the Dart VM converting ints to doubles behind the scenes or is something else going on here?

Thanks :)

FYI, the code is running in the Dart VM.

[Günter Zöchbauer]

Integers are arbitrarily sized.

https://www.dartlang.org/articles/numeric-computation/

[Si Robertson]

Awesome. Thanks, Günter :)

[Cogman]

It is mentioned in Gunter's link but bears repeating.  Dart's ints behave different in the dartvm vs after being compiled by dart2js.  dart2js doesn't do anything to solve the fact that all javascript numerics are doubles.  As a result, things get weird when you talk about abs(numbers) > 2^53

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