How to use ok_or to convert Option to Result

Use the ok_or method on an Option to convert it into a Result, providing a specific error value for the None case. This method returns Ok if the option contains a value, or Err with your provided error if it is None.

let maybe_value: Option<i32> = Some(42);
let result: Result<i32, &str> = maybe_value.ok_or("No value found");

If maybe_value were None, result would be Err("No value found").

Think of ok_or as a safety net that turns a "maybe" into a definite "yes or no with a reason." If you have a value, it wraps it in a success message; if you don't, it creates a failure message using the text you provide. This is useful when you need to handle missing data gracefully without crashing your program.