How would you optimize the sum function for performance?
If performance is critical, use a non-curried approach: function sum(...nums) { return nums.reduce((a, b) => a + b, 0); }. This is O(n) with no closure overhead. But the curried version is for testing concept understanding, not production performance.
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More FAQs in sum(1)(2)(3) Complexity and Optimization
O(n) where n is the number of chained calls. Each call creates a new function and performs one addition. The total work is proportional to the number of calls.
O(n) for the call stack (each call adds a frame). However, since each call returns a new function and the old one is no longer referenced, the GC can free old closures. In practice, the space is close to O(1).
Most JS engines (V8, SpiderMonkey) do not implement tail call optimization, even though the ES6 spec includes it. So return sum(a + b) grows the call stack. For very long chains, this could cause stack overflow.
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