public static Fin <Func <B, C> > apply <A, B, C>(Func <A, Func <B, C> > fabc, Fin <A> fa)
{
if (fa.IsFail)
{
return(Fin <Func <B, C> > .Fail(fa.Error));
}
return(fabc(fa.Value));
}
public static Fin <B> apply <A, B>(Fin <Func <A, B> > fab, Fin <A> fa)
{
if (fab.IsFail)
{
return(Fin <B> .Fail(fab.Error));
}
if (fa.IsFail)
{
return(Fin <B> .Fail(fa.Error));
}
return(fab.Value(fa.Value));
}
public static Fin <C> apply <A, B, C>(Func <A, B, C> fabc, Fin <A> fa, Fin <B> fb)
{
if (fa.IsFail)
{
return(Fin <C> .Fail(fa.Error));
}
if (fb.IsFail)
{
return(Fin <C> .Fail(fb.Error));
}
return(fabc(fa.Value, fb.Value));
}
public static Lst <Fin <B> > Traverse <A, B>(this Fin <Lst <A> > ma, Func <A, B> f) =>
ma.Match(
Fail: er => List(Fin <B> .Fail(er)),
Succ: xs => xs.Map(x => FinSucc(f(x))));
public static IEnumerable <Fin <B> > Traverse <A, B>(this Fin <IEnumerable <A> > ma, Func <A, B> f) =>
ma.Match(
Fail: er => new[] { Fin <B> .Fail(er) },
Succ: xs => xs.Map(x => FinSucc(f(x))));
public static Fin <A> FinFail <A>(Error value) => Fin <A> .Fail(value);
public static Arr <Fin <B> > Traverse <A, B>(this Fin <Arr <A> > ma, Func <A, B> f) =>
ma.Match(
Fail: er => Array(Fin <B> .Fail(er)),
Succ: xs => xs.Map(x => FinSucc(f(x))));
public static Identity <Fin <B> > Traverse <A, B>(this Fin <Identity <A> > ma, Func <A, B> f) =>
ma.Match(
Succ: x => new Identity <Fin <B> >(f(x.Value)),
Fail: e => new Identity <Fin <B> >(Fin <B> .Fail(e)));