[Suggestions] add sum function to math

[erf]

Have you considered adding a sum(a, b) function to the mathpackage for adding two numbers together.

Example implementation:

T sum<T extends num>(T lhs, T rhs) => (lhs + rhs) as T;

Nice to to have if you'd like to e.g. list.reduce(sum)

[lrhn]

Dart has fairly short first class function expressions, so list.reduce((a, b) => a + b) has been considered usable and readable enough that we don't need extra top-level functions that emulate the binary operators.

If we get an even shorter syntax for simple functions (see dart-lang/language#8), perhaps like =>_1+_2, then it would be even briefer: list.reduce(=>_1+_2). Having to give that a name, and take up space in the global namespace, feels like unnecessary overhead.

[erf]

Ok, thanks. I like the shorthand syntax, but the link seem to point to wrong issue?

[lrhn]

Fixed link, forgot I wasn't in the language repo.