Ruby CSV从银行对账单中获得5个最高费用

Question

我有CSV银行对帐单：

Transaction Date|Transaction Type|Transaction Description|Debit Amount
29/09/2015  DEB     TFL.GOV.UK/CP   1.5
29/09/2015  DEB     PRIMARK 674     14
29/09/2015  DEB     PRIMARK 674     7
28/09/2016  DEB     TFL             1.5
27/09/2016  DEB     TFL             1.5
26/09/2016  DEB     MCDONALDS       4.26
26/09/2016  DEB     TFL              3
26/09/2016  DEB     TFL             6.3
26/09/2017  CPT     LNK SOUTHWARK 1  10
25/09/2017  DEB     LIDL            19.3

我需要获得5个最高费用和交易名称。 示例McDonalds 4.26等......

到目前为止，我设法只获得了5个顶级项目。

需要'CSV'

list = []
CSV.foreach('statment_september.csv') do |row|
list << row[5].to_i
end
top_five = list.sort
top_five.last(5)

谢谢

Answer 1

我会做这样的事情：

require 'csv'

top_five = CSV.read('statment_september.csv', headers: false)
              .max_by(5) { |row| -row[3].to_f }