for

Iterates over the values of an array, Vec, range, coroutine or any IntoIterator.

for x in expr { … } pulls one value at a time; ranges such as 0..n are lazy and allocate nothing. C-style for (init; cond; step) loops do not exist. In impl Trait for Type, for names the type the trait is implemented for.

fn main() {
    let total = 0;
    for x in [1, 2, 3] {
        total = total + x;
    }
    for i in 0..10 {
        total = total + i;
    }
}

See also#

• Vec
• IntoIterator
• 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.