On 08/26/2015 09:09, Mark S. Miller wrote:
I don't get it. The conflict between
* the history of ** in other languages,
* the general pattern that unary binds tighter than binary
seems unresolvable. By the first bullet, -2 ** 2 would be -4. By the second, it
would be 4. Either answer will surprise too many programmers. By contrast, no
one is confused by either -Math.pow(2, 2) or Math.pow(-2, 2).
The grammar concerns have been resolved nicely upthread, so I'm not sure what
your objection is. The costs are no more significant than in the original
proposal. ** now has the same precedence as unary operators and weaker than
the increment operators, which matches what most other languages that support
exponentiation do.
There is precedence for unary operators not always binding tighter than binary.
yield 3+4 is yield(3+4), not (yield 3)+4.
Waldemar
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