<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write a JavaScript code snippet to add an event listener to a button with the ID 'submitButton'.
<|im_end|>
<|im_start|>assistant
document.getElementById('submitButton').addEventListener('click', function() {
    // code to run when button is clicked
});<|im_end|>
