<|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 statement to extract the last four characters from the string
This is a sample string.<|im_end|>
<|im_start|>assistant
var lastFour = myString.slice(-4);<|im_end|>
