Looping and conditionals

Looping and conditionals are a part of language constructs. For example,

var i;
for (i = 0; i < 10; i++)
{
  out.writeln(i + ": hello world");
}

The line for (i = 0; i < 10; i++) is an example of looping. When looping, you need to ensure that a condition tells the loop when to end. For example,

var i = 1;
while ( i < 10)
{
   out.writeln(i + "");
   if (i == 3)
   {
     out.writeln("breaking");
     break;
   }
   i++;
}
out.writeln("i at loop completion is: " + i );

The prior script uses a break to exit the loop. To continue a loop after a break and go back to the beginning of the loop for the next iteration, type:

var i = 1;
while ( i < 10)
{
   i++;
   if (i == 3)
   {
     out.writeln("continuing (not printing i)");
     continue;
   }
   out.writeln(i + "");
}

Another conditional language construct is the "else" statement. If something is conditional, you need to decide whether you want to run the next object. The "else" stands for otherwise, meaning, if you are hungry you eat dinner, otherwise you watch television. If you do not have the "else" in the code, the script would mean, you eat dinner and then watch television. The example script of an if else statement:

var hungry = true;


if (hungry)
{
  out.writeln("Where's dinner?");
}
else
{
  out.writeln("not hungry now!");
}