<|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
Assert that an array is not empty before adding items.
<|im_end|>
<|im_start|>assistant
if (array != null && array.length > 0) {
    // add items to array
}<|im_end|>
