static IEnumerable <int> FluentSyntax(string mode) =>
(Enumerable.Range(0, int.MaxValue)
.Select(pass => new { pass, counter = Readers.Counter(0) })
.Select(_ => gcdStartStates.Where(state => predicate(_.pass, _.counter()))
.Select(state => state)
)
).Where(list =>
(Gcd.Run(list.ToList())
.SelectMany(_ => ConsoleWrite(Prompt(mode)), (_, __) => new {})
.SelectMany(_ => ConsoleReadKey(), (_, c) => new { c })
.SelectMany(_ => ConsoleWriteLine(), (_, __) => ToUpper(_.c.KeyChar) == 'Q')
).Invoke()
).Select(list => 0
);
static IEnumerable <int> ComprehensionSyntax2(string mode) =>
(from list in (from pass in Enumerable.Range(0, int.MaxValue)
let counter = Readers.Counter(0)
select from state in gcdStartStates
where predicate(pass, counter())
select state
)
where (from _ in Gcd.Run2(list.ToList()) | IO <Unit> .Empty
from __ in ConsoleWrite(Prompt(mode))
from c in ConsoleReadKey()
from ___ in ConsoleWriteLine()
select ToUpper(c.KeyChar) == 'Q'
).Invoke()
select 0
);
).FirstOrDefault(); // Doesn't assume result list non-empty, unlike: ).First();
static IEnumerable <int> ImperativeSyntax(string mode)
{
for (int pass = 0; pass < int.MaxValue; pass++)
{
var counter = 0;
var list = gcdStartStates.Where(state => predicate(pass, counter++));
Gcd.Run(list.ToList());
Console.Write(Prompt(mode));
var c = Console.ReadKey();
Console.WriteLine();
if (ToUpper(c.KeyChar) == 'Q')
{
yield return(0); //break;
}
}
// return 0;
}