Can every recursive function be written iteratively in JavaScript?
Yes. Any recursive function can be converted to iterative using an explicit stack (array). The iterative version avoids stack overflow but may be less readable. For simple recursion (factorial), iteration is straightforward. For complex recursion (tree traversal with backtracking), the iterative version is verbose.
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More FAQs in Recursion vs Iteration in JavaScript
Use recursion for tree traversal, divide-and-conquer, and self-similar problems (cleaner). Use iteration for simple loops, deep recursion (stack overflow risk), and performance-critical code (no function call overhead).
Yes. Each recursive call adds a frame to the call stack. For deep recursion (e.g., 10,000 calls), the stack overflows: RangeError: Maximum call stack size exceeded. Use iteration or tail call optimization (not supported in most JS engines).
Yes, slightly. Each recursive call has function call overhead (creating a new frame, managing the stack). For simple problems like factorial, iteration is faster. For complex problems like tree traversal, the readability benefit outweighs the small performance cost.
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