Function asyncResult

const successfulResult = asyncResult(Promise.resolve('some value')).map(value => value + ', another value');
await successfulResult.orNull(); // produces: "some value, another value"
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const failureResult = asyncResult(Promise.reject('some failure')).or(reason => asyncFailure(reason + ', another failure'));
await failureResult.orNull(); // produces: null
await failureResult.orElse('Not this'); // produces: "Not this"
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