Error

The ? operator at the end of a Rust function is known as the "try operator" or "question mark operator." It's a powerful feature introduced in Rust 1.38 that simplifies error handling in functions. Let's dive into its usage and benefits.

Understanding the ? Operator

The ? operator is used to propagate errors up the call stack automatically. When used at the end of a function, it unwraps the result of the last expression in the function and returns early if there's an error.

How It Works

1. If the last expression evaluates to Ok(value), the function continues executing normally.

2. If the last expression evaluates to Err(error), the function immediately returns with that error.

3. The ? operator only works on types that implement the Try trait, such as Result and Option.