/// <summary>
/// Returns a new function much like the supplied one, except that the first two arguments' order is reversed.
/// </summary>
/// <code>
///
/// </code>
public static VariadicFunction Flip(VariadicFunction fn)
{
object NewFunction(params object[] args)
{
if (args.Length == 0)
{
return(fn(args));
}
if (args.Length == 1)
{
return(fn(args));
}
else
{
object[] newArgs = new object[args.Length];
Array.Copy(args, newArgs, args.Length);
object temp = args[0];
args[0] = args[1];
args[1] = temp;
return(fn(newArgs));
}
}
return(NewFunction);
}
/// <summary>
/// Returns a new function much like the supplied one, except that the first two arguments' order is reversed.
/// </summary>
/// <code>
/// int[] mergeThree(params int[] args)
/// {
/// return args;
/// }
/// R.Flip{int, int[]}(mergeThree)(1, 2, 3) // => { 2, 1, 3}
/// </code>
public static VariadicFunction <T, K> Flip <T, K>(VariadicFunction <T, K> fn)
{
K NewFunction(params T[] args)
{
if (args.Length == 0)
{
return(fn(args));
}
if (args.Length == 1)
{
return(fn(args));
}
else
{
T[] newArgs = new T[args.Length];
Array.Copy(args, newArgs, args.Length);
T temp = newArgs[0];
newArgs[0] = newArgs[1];
newArgs[1] = temp;
return(fn(newArgs));
}
}
return(NewFunction);
}
