問題：
Very simply, what is tail-call optimization? 很簡單，什麼是尾叫優化？ More specifically, Can anyone show some small code snippets where it could be applied, and where not, with an explanation of why? 更具體地說，任何人均可以顯示一些小的代碼片斷，在何處能夠使用它，而在何處不能夠，並解釋其緣由？ app
解決方案：
參考一： https://stackoom.com/question/1Iti/什麼是尾叫優化參考二： https://oldbug.net/q/1Iti/What-Is-Tail-Call-Optimization