我尝试了这里推荐的解决方案-在Ruby中，最干净的方法是获取数组中最大值的索引？
array = [nil, nil, nil, nil, nil, 0.9655172413793104, nil, nil]
idx = array.each_with_index.max[1]
但是有一些例外：
ArgumentError: comparison of Array with Array failed
from (irb):4:in `each'
from (irb):4:in `each_with_index'
from (irb):4:in `each'
from (irb):4:in `max'
from (irb):4
from /Users/davea/.rvm/gems/ruby-2.4.0/gems/railties-5.0.3/lib/rails/commands/console.rb:65:in `start'
from /Users/davea/.rvm/gems/ruby-2.4.0/gems/railties-5.0.3/lib/rails/commands/console_helper.rb:9:in `start'
from /Users/davea/.rvm/gems/ruby-2.4.0/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:78:in `console'
from /Users/davea/.rvm/gems/ruby-2.4.0/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /Users/davea/.rvm/gems/ruby-2.4.0/gems/railties-5.0.3/lib/rails/commands.rb:18:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
如果nil要从结果中省略，则可以使用：
array.index(array.compact.max)
或者，如果您希望将nils视为零，请先将它们转换为Floats：
array.index(array.map(&:to_f).max)
如果出现平局，这将返回第一个最大值的索引。您还可以使用获取最后的索引Array#rindex。
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我来说两句