<|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
Update the following JavaScript code to add a new item to the end of an array using the push() method.
let myArr = ['a', 'b', 'c']<|im_end|>
<|im_start|>assistant
let myArr = ['a', 'b', 'c'];
myArr.push('d');<|im_end|>
