guenhter/plauscherl-WAT

Some random WAT examples inspired by Gary Bernhardt

plauscherl-WAT

Some random WAT examples inspired by Gary Bernhardt https://www.destroyallsoftware.com/talks/wat

JavaScript - Properties

  {}[0] == true
=> false
   {}[1] == true
=> true
   !{}[0] == true
=> true
   !{}[1] == true
=> true

Java - Url equation

Set<URL> m = new HashSet<>();
m.add(new URL("http://www.google.at"));
System.out.println(m.contains(new URL("http://www.google.at")));
Thread.sleep(TimeUnit.MINUTES.toMillis(6));
System.out.println(m.contains(new URL("http://www.google.at")));

Java - Integer caching

int a = 1000, b = 1000;  
System.out.println(a == b); // true
Integer c = 1000, d = 1000;  
System.out.println(c == d); // false
Integer e = 100, f = 100;  
System.out.println(e == f); // true

C# - Magic nullable (1)

object a = null;
object a = new object();
object a = new Nullable<int>();

if (a == null) {
    Console.WriteLine("--- null");
} else {
    Console.WriteLine("not null");
}

C# - Magic nullable (2)

object a = null;
Nullable<int> a = null;

a.ToString();

C# - dynamic

dynamic a = null;
dynamic b = null;

Console.WriteLine( a - 42 == b);

JavaScript - Object and Arrays

   [] + []
=> ''
   [] + {}
=> '[object Object]'
   {} + []
=> 0
   {} + {}
=> NaN