public void Test_ThousandMillionData_Transforms()
{
var data = Range(1, 1000000000);
Func <int, int> multiply = (a) => a * 2;
Func <int, int> add2 = (a) => a + 2;
Func <int, string> toString = (a) => a.ToString();
var coyoVal = Coyo.Of <IEnumerable <int>, int>(data)
.Map(multiply)
.Map(add2)
.Map(toString)
.Map(String.ToUpper);
Stopwatch sw1 = new Stopwatch();
Stopwatch sw2 = new Stopwatch();
sw1.Start();
var chained = data.Map(multiply).Map(add2).Map(toString).Map(String.ToUpper);
sw1.Stop();
var elapsed1 = sw1.Elapsed;
sw2.Start();
var composed = coyoVal.Value.Map(x => coyoVal.Func(x));
sw2.Stop();
var elapsed2 = sw2.Elapsed;
// Better test first for the equality check takes way too long
var first1 = chained.FirstOr("");
var first2 = composed.FirstOr("");
Assert.True(elapsed1 > elapsed2);
Assert.Equal(first1, first2);
}
public void Test_Run_Coyo_After_Composing()
{
Func <string, char[]> splitByChars = s => s.ToCharArray();
Func <char[], int> countLength = s => s.Count();
var coyo = Coyo.Of <string, string>("hola")
.Map(String.ToUpper)
.Map(splitByChars)
.Map(countLength)
.Run();
Assert.Equal(4, coyo);
}
public void Check()
{
var tree = Branch(
Branch(Leaf(1), Leaf(2)),
Leaf(3)
);
var coyoTree = Coyo.Of <Tree <int>, int>(tree)
.Map(i => i + 1)
.Map(i => i * 10);
var expected = Branch(
Branch(Leaf(20), Leaf(30)),
Leaf(40)
);
Assert.Equal(expected, coyoTree.Run());
}
public static void _main()
{
var emails = List(" [email protected] ");
// eager evaluation: 2 passes through the list
emails.Map(String.Trim)
.Map(String.ToLower)
.ForEach(Console.WriteLine);
// lazy evaluation: coyo just composes the functions to be mapped
var coyo = Coyo.Of <List <string>, string>(emails)
.Map(String.Trim)
.Map(String.ToLower);
// composed functions are applied only when Run is called
// with a single pass over the list
var results = coyo.Run();
results.ForEach(Console.WriteLine);
}
public static List <R> Run <T, R>(this Coyo <List <T>, R> @this) => @this.Value.Map(t => @this.Func(t));