Function asyncResult

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