Some ideas to make this code more useful:

• a constructor to allow new Ok(42)
• implement map methods:
  • or_else(defaultValue) -> return defaultValue for Err, $this->value for Ok
  • map() -> no op for Err, change value allowing type mutability for Value
  • map_err() -> no op for Value, change value allowing any Exception for Err

In PHP 8.1, could be interesting to do this:

use Keruald\OmniTools\DataTypes\Result;
use Keruald\OmniTools\DataTypes\ResultShape;

#[ResultShape(string, string)]
function doSomething() : Result {
    return ...;
}

$result = match (doSomething()) {
    $result->isOk() => $result->getValue(),
    default => throw new RuntimeException($result->getError()),
};

For this to work, we need two things:

• Declare getError() in Result too
• A ResultShape attribute to be able to typehint the Result