Result::is_err

pub fn is_err() -> bool

True when this is Err.

Called on a Result value as value.is_err(…).

Returns#

bool

See also#

• Result
• Result::is_ok: True when this is Ok.
• Result::ok: The Ok value as an Option.
• Result::err: The Err value as an Option.
• Result::unwrap_or: The Ok value, or fallback on Err.
• Result::unwrap_or_else: The Ok value, or f applied to the error.
• Result::map: Ok(f(value)), or the same error.
• Result::map_err: The same value, or Err(f(error)).