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Description:
typed result
typed_result provide a convenience Result monad to represent success and error.
A Result<T, E> class can be either a success (Ok<T> class) or an error (Err<E> class).
// Result<T, E> --+-- Ok<T>
// |
// +-- Err<E>
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Features #
This package aims to provide convenience methods for:
Getting a value (get, getOr, getOrThrow, getError, getErrorOr and getErrorOrThrow)
Mapping a Result value into another Result (map, mapError and mapBoth)
Execute a block based on the result (onSuccess and onFailure), (when)
Wrap a block, transforming it's exception into error (runCatching)
Wrap any value to a result based on the nullability (toResultOr)
Testing results with custom matchers
Usage #
An Result<T, E> can't be instantiated directly.
To create a Result, simply create an instance of Ok<T> or Err<E>.
var result = Ok(1); // as Ok<int>
var result = Err(""); // as Err<String>
Result<int, String> result = Ok(1); // as Result<int, *>, where * can be defined with any type
Result<int, String> result = Err(""); // as Result<*, String>, where * can be defined with any type
// As a return of a function
Result<int, String> getData() {
if(condition) {
return Ok(1);
} else {
return Err("");
}
}
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Additional information #
This package is hugely based on a Kotlin library made by Michael Bull.
The motivation for creating this package comes from using this library in Kotlin projects and missing these features in Dart.
License
For personal and professional use. You cannot resell or redistribute these repositories in their original state.
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