break

Leaves the innermost while or for loop at once.

A break skips the loop’s invariant check.

fn first_negative(Vec<int> xs) -> int {
    let found = 0;
    for x in xs {
        if x < 0 {
            found = x;
            break;
        }
    }
    return found;
}

See also#

• fn: Declares a function, a method, or (written in an expression) an anonymous function.
• let: Declares a mutable local variable.
• const: Declares a binding that cannot be reassigned: a local, a module constant, or a class field that is set only by new.
• static: Declares a module-level or class-level slot shared by the whole program, or a method without self.
• readonly: A read-only view of a value: nothing reachable through it can be changed.
• if: Runs a block when a bool condition is true.
• else: Introduces the branch of an if that runs when its condition is false (or its pattern does not match).
• while: Repeats a block while a bool condition is true.