test.txt

print "two";
print false;
print 10 + 30;

var x = 100;
var y = 3;
print  x * y;

var a = "global a";
var b = "global b";
var c = "global c";

{
  var a = "outer a";
  var b = "outer b";
  {
    var a = "inner a";
    print a;
    print b;
    print c;
  }
  print a;
  print b;
  print c;
}

print a;
print b;
print c;

var c = 0;
var d = 1;

while (c < 10000) {
  print c;
  var temp = c;
  c = d;
  d = temp + d;
}

fun sayHello(first, last) {
    print "Hello, " + first + " " + last + "!";
}

sayHello("Dear", "Reader");

fun fibonacci(n) {
  if (n <= 1) return n;
  return fibonacci(n - 2) + fibonacci(n - 1);
}

for (var i = 0; i < 20; i = i + 1) {
  print fibonacci(i);
}

print "break";
print "start makeCounter function";

fun makeCounter() {
  var i = 0;
  fun count() {
    i = i + 1;
    print i;
  }

  return count;
}

var counter = makeCounter();
counter(); // "1".
counter(); // "2".