Transforms the value inside an Error without changing the context of the computation.
This API is still experimental, so it may change or be removed in future versions. You should not rely on it for production applications.
forall a, b, c:
(Result a b).((a) => c) => Result c bTransforms the value inside an Error without changing the context of the computation.
This is similar to .map, except it operates on Errors instead of Oks.
const Result = require('folktale/result');
Result.Error(1).mapError(x => x + 1);
// ==> Result.Error(2)
Result.Ok(1).mapError(x => x + 1);
// ==> Result.Ok(1)
{
/*~*/
Error: function mapError(f) {
assertFunction('Result.Error#mapError', f);
return Error(f(this.value));
},
/*~*/
Ok: function mapError(f) {
assertFunction('Result.Ok#mapError', f);
return this;
}
}