for loops

for loops iterate over:

• integer ranges (start..end / start..=end),
• builtin arrays and slices (for x in xs { ... }),
• iterator values (for x in it { ... } when it.next() -> T?),
• and C-style headers (for (init; cond; step) { ... }).

Full reference: flow for.

Notes#

• Supported forms + Limitations: flow for

Syntax#

for x in xs {
  // ...
}

for (let i = 0; i < 10; ++i) {
  // ...
}

Examples#

Example: range iteration#

fn main () -> int {
  let mut sum: int = 0;
  for i in 0..3 {
    sum += i; // 0, 1, 2
  }
  return sum;
}

Example: array iteration#

fn main () -> int {
  let xs: int[3] = [1, 2, 3];
  let mut sum: int = 0;
  for x in xs {
    sum += x;
  }
  return sum;
}

See also#

• Full reference: flow for
• Iterator protocol (Supported forms): interfaces