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{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is recursion in JavaScript?","acceptedAnswer":{"@type":"Answer","text":"Recursion is when a function calls itself to solve a problem. Each recursive call works on a smaller piece of the problem until it reaches a base case that stops the recursion. It's useful for tasks like tree traversal, calculating factorials, and processing nested data structures."}},{"@type":"Question","name":"What is a base case in recursion?","acceptedAnswer":{"@type":"Answer","text":"A base case is the condition that stops the recursion. Without a base case, the function would call itself forever, causing a stack overflow. The base case typically handles the simplest version of the problem and returns a direct value."}},{"@type":"Question","name":"When should I use recursion instead of loops?","acceptedAnswer":{"@type":"Answer","text":"Use recursion when dealing with tree-like structures, nested data, or problems that naturally divide into smaller subproblems (like quicksort or mergesort). Use loops for simple iterations. Recursion can be more elegant for complex problems but may use more memory due to the call stack."}},{"@type":"Question","name":"What is a stack overflow in recursion?","acceptedAnswer":{"@type":"Answer","text":"A stack overflow occurs when too many recursive calls are made, exceeding the call stack limit. This happens when there is no base case, the base case is never reached, or the recursion is too deep. JavaScript engines typically allow 10,000-100,000 stack frames."}},{"@type":"Question","name":"What is tail recursion?","acceptedAnswer":{"@type":"Answer","text":"Tail recursion is when the recursive call is the last operation in the function. Some languages optimize tail-recursive functions to reuse stack frames, preventing stack overflow. While JavaScript ES6 specifies tail call optimization, most browsers do not implement it."}}]}