All files / result/operator mapFailure.ts

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import {UnaryFunction} from 'fnxt/fnxt-types';
import {Failure, Result, ResultType} from '../result';
 
export const mapFailure = <T, R1, R2>(fn: UnaryFunction<R1, R2>) => (
  result: Result<T, R1>
): Result<T, R2> => {
  switch (result.type) {
    case ResultType.Success:
      return result;
    case ResultType.Failure:
      return Failure(fn(result.value));
  }
};