CodeHS Glossary

Condition General

A condition is code that you put inside an if statement or while loop.

The condition returns true or false. This allows you to “ask a question” to your code about something.

Some examples of conditions in Karel are:

frontIsClear()
facingNorth()
noBallsPresent()

Examples of how to use a condition:

if (noBallsPresent()) 
{
    putBall();
}

while (frontIsClear()) 
{
    move();
}

Common Errors:

• If you forget the () at the end of the condition, it will always
  return true, so you need to always have the ()
• If you have a semicolon after the condition, it will not work.

In Java and JavaScript, a condition can be any boolean expression. Some examples are:

if (num < 10) {
    ...
}

while (ball.getY() > getHeight() && lives > 0) {
    ...
}