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Addition is associative. (1 + (2 + 3)) gives the same result as ((1 + 2) + 3). In the recursive function we are summing “from the right”, building up a stack of unresolved additions “on the left” which can’t be resolved until the right side is done. In our iterative solution we are summing “from the left”, and so do not need to defer any work.
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“为人民出政绩，要求领导干部跳出短期利益考量，着眼长远，真正对人民负责。”曹杨新村街道党工委书记许春辉说。
Explicit return. I find I prefer code where return points are made explicit. Lisp will implicitly return the result of the last evaluation