Scala数组的间隔数的索引(Scala the index of a number in which interval of an array)

Scala数组的间隔数的索引(Scala the index of a number in which interval of an array)

假设我有一个(0, 0.1, 0.2, ..., 1)的数组，我有一个数字0.15 ，我希望得到它的索引。 由于0.15 > 0.1和0.15 < 0.2 ，因此它在区间2 。 有没有最先进的方法来做到这一点？ 目前我使用带有var变量的for循环并遍历每个间隔，但我不认为这是最好的方法。

Suppose I have an array of (0, 0.1, 0.2, ..., 1) and I have a number 0.15, I'd hope to get the index of that. Since 0.15 > 0.1 and 0.15 < 0.2, it is in the interval 2. Is there a state-of-art way to do that? Currently I use a for loop with a var variable and go through each interval but I do not think it's the best way.

最满意答案

假设数组已订购，您可以尝试：

arr.indexWhere(_ >= 0.15) - 1

如果没有这样的实例，你会得到 - 2。

assuming the array is ordered you can try:

arr.indexWhere(_ >= 0.15) - 1

if there is no such instance you get - 2.