最好的纯功能替代while循环

Question

下面的代码是一个更好的功能习惯替代品吗？即是否有一种更简洁的方法来获取值j而不必使用var？

<div class="txt">
    This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. 
</div>

Answer 1

val j = idxs.drop(i).indexWhere(_ != x) + i

或者，正如@kosii在评论中所建议的那样，使用indexWhere重载来获取从哪里开始搜索的索引：

val j = idxs.indexWhere(_ != x, i)

修改

由于j必须等于idxs的长度，以防i后的所有项都等于x：

val index = idxs.indexWhere(_ != x, i)
val j = if(index < 0) idxs.length else index

// or

val j = if (idxs.drop(i).forall(_ == x)) idxs.length
        else idxs.indexWhere(_ != x, i)

Answer 2

也许使用溪流，例如：

a = True