Rust Result Default Error Type. Print the numbers on each line of a string multiplied by two. Unwrap_or unwrap_or_default and unwrap_or_else These are bit similar to unwrap If an Option type has Some value or a Result type has a Ok value the value inside them passes to the next step.
Rather than the default panic. Error handling with the Result type. Unwrap_or unwrap_or_default and unwrap_or_else These are bit similar to unwrap If an Option type has Some value or a Result type has a Ok value the value inside them passes to the next step.
Merging or switching from a stream of Result objects onto a stream of objects.
Recall from Handling Potential Failure with the Result Type in Chapter 2 that the Result enum is defined as having two variants Ok and Err. They are also uses as hubs connecting to other relevant issues eg bugs or open design questions. If a function can produce an error we have to use a Result type by combining the data type of the valid output and the data type of the error. Merging or switching from a stream of Result objects onto a stream of objects.