有没有一种方法可以在数组中添加尾部比在F＃中附加更有效？

I am currently trying to build a program where I have a recursive function that for every loop appends one new element to the array it is building. I didn't want to use the append function that many times, because my function is supposed to do a large number of loops, and I've come to learn from previous experiences that the append function in general takes a lot of time. I've tried to look everywhere for a function that simply adds one element to the tail of the array, but I've found nothing of such sort. So I was thinking I would ask here.I am currently trying to build a program where