Type JavaScript in the textbox and then click the Test Code button to trace through the code.
The textbox already contains an example. Click the Clear button to delete the example. 
For CodeTracer to work, you must follow these rules:

• Variable names must be a lower-case letter of the alphabet between "a" and "h"
• Declare all variables using var
• Do NOT initialize variables when you declare them
• Type only one statement on each line
• Use brackets for if...else statements
• Do NOT indent var statements

var a for(a=1; a<5; a++){ if(a%2==0){ document.write(a + " is even<br />") } }