No, not at all. I hate var & val because I never can remember which is which (from Scala, which I never really used a lot).
let vs let mut is /clear/ - you can simply not mix them up.
let vs let mut is /clear/ - you can simply not mix them up.
“Let” feels like some in-joke, coming from a math via lisp heritage of “let k be any number...” to distinguish it in English from the surrounding writing. I have to guess that in early lisp (= k 5) would be an error as k isn’t defined and (k 5) errors because k isn’t a function and (let (k 5)) comes out of need for a binding function and why not “let”.
In c-like languages “k=5” is an established binding that both programmers and compilers can deal with. What does “let k=5;” add to Rust over “k=5;” ?
val => value => is immutable
Of course people are different, but this seems clear as day, assmuning very basic familiarity with functional programming?
if mutable is expensive, and should be difficult then "let mut" makes more sense.
var looks like a default to me, not a special case that needs care.