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Обсуждение на тему: Rust return
Rust return
A return marks the end of an execution path in a function return 3 asserteq!(foo(), 3) return is not needed when the returned value is the last expression in the function. In this case the is omitted asserteq!(foo(), 3) use stdioerror, errorkind, read, result fn main() - result() using a return as the last line of a function works, but is considered poor style if x 5 return x return x 1 i know i could have written the above as. Возвращение значения из функции в языке программирования rust, оператор -, присвоение результата функции переменнойthe final expression in the function will be used as return value. Alternatively, the return statement can be used to return a value earlier from within the function, even from inside loops or if statements. Learn how to use the return keyword to exit a function and return a value in rust.
See the syntax, examples, and rules for return expressions in this reference document. Rust provides a very convenient operator to test if an operation succeeded, if so, capture the positive result, if not, return out of the function with the error. This is especially useful when you are running a sequence of operations that could fail as part of a function. Return 3 asserteq! (foo (), 3) return не нужен, когда возвращаемое значение является последним выражением в функции. В этом случае опускается asserteq! (foo (), 3) use stdioerror, errorkind, read, result fn main () - result () let mut file match file open (foo.
Txt) ok (f) f,the functions can return a value using the return keyword inside the function definition. After the return statement is executed, the control gets back to the caller. A function invocation is replaced with the value that the call returns. Basically, when you use return, you break the flow of the current function and return the intended value.
No more code will be executed in the function after that, which is the expected behavior of the keywork in most languages. Early returning is one of multiple primitives in rust that can break ordinary control-flow. The type of an expression is the type of the value the expression will evaluate to. .