省略Ruby的指数运算符周围的空格有什么意义？

Question

I'm just curious about what the grounds are for omitting spaces around Ruby's exponent operator. Community-based Ruby coding style guide says one should use spaces around operators except the exponent operator ( ** ), ie:

# bad
e = M * c ** 2

# good
e = M * c**2

I failed to find any info about the question at all.

Answer 1

Probably to mirror the hand-written way of expressing that the exponent operator has a high precedence to the term it's associated with:

Written:

• M xc ²

Code:

• M * c**2