JavaScript Arrays vs Objects: Myths, Destructuring & Puzzles That Will Break Your Brain

Arrays can have "holes" created by assigning values at indices beyond their current length, increasing the array's length accordingly. Empty arrays are equal to false when using loose equality (==) due to type coercion but not with strict equality (===). Objects in JavaScript are stored by reference; thus, changes made through one variable affect all references pointing to that object. To avoid this and create a true copy of an object, use the spread operator or other cloning methods.

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