public static T first <T>(IEnumerable <T> ts)
{
Bomb.ifNull(ts, () => "null ts!");
var e = ts.GetEnumerator();
Bomb.unless(e.MoveNext(), () => "can't get first of empty enumerable");
return(e.Current);
}
public static T nth <T>(IEnumerable <T> ts, int n)
{
Bomb.ifNull(ts, () => "null ts!");
var e = ts.GetEnumerator();
zeroTo(n, i => Bomb.unless(e.MoveNext(), () => "can't get " + (i + 1) + "th of empty enumerable"));
return(e.Current);
}
public static IEnumerable <T> rest <T>(IEnumerable <T> ts)
{
Bomb.ifNull(ts, () => "null ts!");
var e = ts.GetEnumerator();
Bomb.unless(e.MoveNext(), () => "can't get rest of empty enumerable");
while (e.MoveNext())
{
yield return(e.Current);
}
}
static void requireNonEmpty <T>(IList <T> ts)
{
Bomb.when(Bomb.ifNull(ts, () => "null ts!").Count < 1, () => "empty list passed to requireNonEmpty");
}
