<|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
Create a JavaScript object with two keys "firstName" and "lastName".
Ahsan<|im_end|>
<|im_start|>assistant
let person = {
    "firstName": "Ahsan",
    "lastName": ""
}<|im_end|>
