public static List <B> SelectMany <A, B>(this List <A> ps, Func <A, List <B> > f)
{
var b = ListBuffer <B> .Empty();
foreach (var a in ps)
{
b.Append(f(a));
}
return(b.ToList);
}
public List <B> Extend <B>(Func <List <A>, B> f)
{
var b = ListBuffer <B> .Empty();
var a = this;
while (!a.IsEmpty)
{
b.Snoc(f(a));
a = a.UnsafeTail;
}
return(b.ToList);
}
public List <A> Where(Func <A, bool> f)
{
var b = ListBuffer <A> .Empty();
foreach (var a in this)
{
if (f(a))
{
b.Snoc(a);
}
}
return(b.ToList);
}
public NonEmptyList <B> Extend <B>(Func <NonEmptyList <A>, B> f)
{
var b = ListBuffer <B> .Empty();
var a = tail;
while (!a.IsEmpty)
{
b.Snoc(f(new NonEmptyList <A>(a.UnsafeHead, a.UnsafeTail)));
a = a.UnsafeTail;
}
return(new NonEmptyList <B>(f(this), b.ToList));
}
public List <A> Append(List <A> x)
{
var b = ListBuffer <A> .Empty();
foreach (var a in this)
{
b.Snoc(a);
}
foreach (var a in x)
{
b.Snoc(a);
}
return(b.ToList);
}