Rust Result Dyn Error. But thats all in the past. Empowering everyone to build reliable and efficient software.
Print the numbers on each line of a string multiplied by two. One advantage of this approach beyond having more control about how our program exits such as via different exit code is that it allows us to change how the message is formatted. Using the match expression could make our codes bloated.
Maps a Result to Result by applying a function to a contained Ok value leaving an Err value untouched.
When a Result is followed with Rust will effectively inject code that will. We should try explore these caveats to see what it would take to make them possible. The Box type is called a trait object. The Result type will let you know if something went Ok or if there was an Err - and which types to expect out of those two values.