Exponentiation operator precedence
waldemar at google.com
Mon Aug 24 22:45:47 UTC 2015
On 08/24/2015 10:08, Jason Orendorff wrote:
> In math, -x² is -(x²), not (-x)². But as proposed for JS, -x**2 is (-x)**2.
> PHP, Python, Haskell, and D side with the traditional algebraic
> notation, against JS. Here's PHP:
> $ php -r 'print(-2 ** 2);'
> >>> -2 ** 2
> Prelude> -2 ^ 2
> The D grammar: http://dlang.org/grammar.html#UnaryExpression
> Let's switch.
Let's not. As I said at the last meeting, making ** bind tighter than unary operators would break x**-2. And making it sometimes tighter and sometimes looser would be too confusing and lead to other opportunities for precedence inversion.
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