What is the idiomatic way to write a for loop without using the iterator value?

Question

Assuming I want a finite loop using a range:

let mut x: i32 = 0; for i in 1..10 {     x += 1; } 

The compiler will spit out the warning:

warning: unused variable: `i`, #[warn(unused_variables)] on by default for i in 1..10 {     ^ 

Is there a more idiomatic way to write this that won't make the compiler complain?

Answer 1

You can write _ as your pattern, meaning “discard the value”:

let mut x: i32 = 0; for _ in 1..10 {     x += 1; }