Concise Error Handling in Rust: '?' Operator and Result

In Rust, the "question mark" operator is a shorthand for handling errors. It returns the unwrapped value if it's Ok or exits the function and returns the error if it's Err. This helps in concise, readable error handling. Combining this with Result, a built-in enum for error handling, you can manage errors efficiently.

This Rust code demonstrates using the "question mark" operator with Result. The function read_file() opens a file and reads its content. If an error occurs at any stage, the "question mark" operator triggers a return of the error.