/// <summary>
/// Create a filtered array.
/// </summary>
public static T[] Where <T>(this T[] array, Func <T, bool> predicate)
{
if ((array == null) || (array.Length == 0))
{
return(array);
}
ArrayList <T> list = null;
foreach (var item in array)
{
if (predicate(item))
{
if (list == null)
{
list = new ArrayList <T>(array.Length);
}
list.Add(item);
}
}
var elementType = array.GetType().GetElementType();
if (list == null)
{
return((T[])Array.NewInstance(elementType, 0));
}
return(list.ToArray((T[])Array.NewInstance(elementType, list.Count)));
}
public static T[] Take <T>(this T[] array, int count)
{
var len = Math.Min(count, array.Length);
T[] ret = new T[len];
System.Array.Copy(array, ret, len);
return(ret);
}
public static T FirstOrDefault <T>(this T[] array)
{
int len = array.Length;
if (len == 0)
{
return(default(T));
}
return(array[0]);
}
public static T FirstOrDefault <T>(this T[] array, Func <T, bool> predicate)
{
int len = array.Length;
for (int i = 0; i < len; ++i)
{
if (predicate(array[i]))
{
return(array[i]);
}
}
return(default(T));
}
public static TOut[] Select <TIn, TOut>(this TIn[] array, Func <TIn, TOut> select)
{
if ((array == null) || (array.Length == 0))
{
return(new TOut[0]);
}
var ret = new TOut[array.Length];
for (int i = 0; i < array.Length; ++i)
{
ret[i] = select(array[i]);
}
return(ret);
}
public static T Last <T>(this T[] array)
{
int len = array.Length;
return(array[len - 1]);
}