On Friday, 18 November 2022 at 17:57:25 UTC, H. S. Teoh wrote:
You're looking at it the wrong way. The kind of issues having
const
would solve is like when your function takes parameters x, y,
z, and
somewhere deep in the function you see the expression `x +
y*z`. If x,
y, and z are const, then you immediately know what the value of
this
expression is. However, if they were not, then you'd have to
trace
through all of the preceding code to figure out whether their
values
have changed, and how they have changed. The former makes the
code
easier to understand, the latter adds complexity to
understanding the
code.
AFAIK Rust allows shadowing (intentionally) to solve usability
problems with immutable variables, so when deep in the function
you see `x+y*z`, you can't immediately tell its value, because
the variables could be previously shadowed and you have to trace
through all of the preceding code to figure it out :)
