<ul><li>An array in JavaScript is a fundamental data structure used to store multiple values in an ordered list.</li><li>JavaScript provides various built-in methods for manipulating arrays like push(), pop(), unshift(), shift(), forEach(), map(), filter(), reduce(), find(), some(), every(), indexOf(), includes(), sort(), reverse(), and more.</li><li>Optimizing JavaScript code can improve efficiency by using push() instead of unshift(), Set for unique values, and wisely using map() and reduce().</li><li>Common JavaScript array interview questions include reversing an array, finding a missing number, implementing a custom map function, rotating an array, and finding the most frequent element.</li></ul>

The Ultimate JavaScript Array Cheat Sheet

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