<ul><li>JavaScript Arrays: Essential Questions and Answers</li><li>Arrays in JavaScript can be declared using brackets or the Array constructor function.</li><li>Key differences: Bracket notation is preferred over the Array constructor for array declaration.</li><li>Arrays store collections of data and are optimized for ordered collections.</li><li>Accessing elements in arrays is zero-indexed in JavaScript.</li><li>JavaScript arrays can be accessed using numeric indices.</li><li>Adding elements to an array can be done using .push() or .unshift() for end or beginning insertion.</li><li>.push(), .pop(), .shift(), and .unshift() are methods for adding/removing elements in arrays.</li><li>Looping through arrays can be done with for loop, .forEach(), and .map().</li><li>Sparse arrays in JavaScript have empty slots instead of actual values.</li></ul>

JavaScript Arrays: Essential Questions and Answers

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