According this in [Nim
tutorial](https://nim-lang.org/docs/tut1.html#procedures-parameters):
> Parameters are immutable in the procedure body. By default, their value
> cannot be changed because this allows the compiler to implement parameter
> passing in the most efficient way. If a mutable variable is needed inside the
> procedure, it has to be declared with `var` in the procedure body. Shadowing
> the parameter name is possible, and actually an idiom:
>
>
> proc printSeq(s: seq, nprinted: int = -1) =
> var nprinted = if nprinted == -1: s.len else: min(nprinted, s.len)
> for i in 0 ..< nprinted:
> echo s[i]
>
>
> Run
I tested this example, but changed `var` to `let`. My code:
proc printSeq(s: seq, nprinted: int = -1) =
let nprinted = if nprinted == -1 : s.len else: min(nprinted, s.len)
for i in 0 ..< nprinted:
echo s[i]
printSeq(@['a', 'b', 'c', 'd', 'e', 'f'])
Run
My code works fine:
(how to insert screenshot?)
So can I use `let`? Is document is correct there? Or it's a bit old?
Orlean.
