Why do the same work about 'IndexOfAny' and 'indexOf' function?

[FrankLike via Digitalmars-d-learn]

On Friday, 9 January 2015 at 10:02:53 UTC, ketmar via 
Digitalmars-d-learn wrote:

>   import std.algorithm, std.stdio;
>
>   void main () {
>     string s = "he is at home";
>     if (["home", "office", "sea", "plane"].canFind!((a, string 
> b) => b.canFind(a))(s)) {
>       writeln("got it!");
>     } else {
>       writeln("alas...");
>     }
>   }

Thank you.

The code is the best,and it's better than indexOfAny in C#:

/*  places.canFind!(a => strWhere.canFind(a));  */

By  auto r = benchmark!(f0,f1, f2, f3,f4)(10_0000);

Result is :
filter is          42ms 85us
findAmong is       37ms 268us
foreach indexOf is 37ms 841us
canFind is         13ms
canFind indexOf is 39ms 455us

-----------------------5 functions--------------------------
import  std.stdio, std.algorithm,std.string;

auto places = [ "home", "office", "sea","plane"];
auto strWhere = "He is in the sea.";

void main()
{
   auto where = places.filter!(a => strWhere.indexOf(a) != -1);
	writeln("0 Result is  ",where);
	
	auto where1 = findAmong(places,strWhere);
	writeln("1 Result is  ",where1);
	
	string where2;
	foreach(a;places)
	{
		if(strWhere.indexOf(a) !=-1)
		{
		  where2 = a;
		 break;
		}
	}
	writeln("2 Result is  ",where2);
	
	auto where3 = places.canFind!(a => strWhere.canFind(a));
	writeln("3 Result is  ",where3);
	
	auto where4 = places.canFind!(a => strWhere.indexOf(a) != -1);
	writeln("4 Result is  ",where4);
}

Frank