<|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 program to take an array of numbers, and return an array in which each element is the result of squaring the original.
[1,2,3,4]<|im_end|>
<|im_start|>assistant
[1,4,9,16]<|im_end|>
