I have an array of elements. If I do a arr.max I will get the maximum value. But I would like to get the index of the array. How to find it in Ruby
我有一个元素数组。如果我做一个arr。最大值。但是我想要得到数组的索引。如何在Ruby中找到它
For example
例如
a = [3,6,774,24,56,2,64,56,34]
=> [3, 6, 774, 24, 56, 2, 64, 56, 34]
>> a.max
a.max
=> 774
I need to know the index of that 774 which is 2. How do I do this in Ruby?
我需要知道774的指数是2。如何在Ruby中实现这一点?
3 个解决方案
#1
33
a.index(a.max) should give you want you want
#2
26
In 1.8.7+ each_with_index.max will return an array containing the maximum element and its index:
在1.8.7 + each_with_index。max会返回一个包含最大元素及其索引的数组:
[3,6,774,24,56,2,64,56,34].each_with_index.max #=> [774, 2]
In 1.8.6 you can use enum_for to get the same effect:
在1.8.6中，您可以使用enum_for获得相同的效果:
require 'enumerator'
[3,6,774,24,56,2,64,56,34].enum_for(:each_with_index).max #=> [774, 2]
#3
7
that should work
这应该工作
[7,5,10,9,6,8].each_with_index.max
#1
33
a.index(a.max) should give you want you want
#2
26
In 1.8.7+ each_with_index.max will return an array containing the maximum element and its index:
在1.8.7 + each_with_index。max会返回一个包含最大元素及其索引的数组:
[3,6,774,24,56,2,64,56,34].each_with_index.max #=> [774, 2]
In 1.8.6 you can use enum_for to get the same effect:
在1.8.6中，您可以使用enum_for获得相同的效果:
require 'enumerator'
[3,6,774,24,56,2,64,56,34].enum_for(:each_with_index).max #=> [774, 2]
#3
7
that should work
这应该工作
[7,5,10,9,6,8].each_with_index.max