Method

Sometimes, the state of an object decides which method has to be executed. Instead of an unwieldy switch construction like this …

switch (task) {

case "sleep":
sleep();
break;

case "walk":
walk();
break;

}

… you can use the someObject[someExpression] notation. This works for any object, and you can use it to access both variables and methods. All those lines from above become this:

thistask;