操作數組：向重複元素添加出現次數

Question

（歡迎將標題更改爲更合適的標題！）

我又找到了一個Ruby/ERB問題。我有這個文件：

ec2-23-22-59-32, mongoc, i-b8b44, instnum=1, Running 
ec2-54-27-11-46, mongod, i-43f9f, instnum=2, Running 
ec2-78-62-192-20, mongod, i-02fa4, instnum=3, Running 
ec2-24-47-51-23, mongos, i-546c4, instnum=4, Running 
ec2-72-95-64-22, mongos, i-5d634, instnum=5, Running 
ec2-27-22-219-75, mongoc, i-02fa6, instnum=6, Running 

我可以處理該文件創建一個這樣的數組：

irb(main):007:0> open(inFile).each { |ln| puts ln.split(',').map(&:strip)[0..1] } 
ec2-23-22-59-32 
mongoc 
ec2-54-27-11-46 
mongod 
.... 
.... 

但我真正想要的是級聯到的出現次數「mongo-鍵入」使其變成：

ec2-23-22-59-32 
mongoc1 
ec2-54-27-11-46 
mongod1 
ec2-78-62-192-20 
mongod2 
ec2-24-47-51-23 
mongos1 
ec2-72-95-64-22 
mongos2 
ec2-27-22-219-75 
mongoc2 

每個蒙戈型的數目不是固定的，它隨時間變化。任何幫助，我該怎麼做？提前致謝。乾杯！！

Answer 1

快速的答案（也許可以優化）：

data = 'ec2-23-22-59-32, mongoc, i-b8b44, instnum=1, Running 
ec2-54-27-11-46, mongod, i-43f9f, instnum=2, Running 
ec2-78-62-192-20, mongod, i-02fa4, instnum=3, Running 
ec2-24-47-51-23, mongos, i-546c4, instnum=4, Running 
ec2-72-95-64-22, mongos, i-5d634, instnum=5, Running 
ec2-27-22-219-75, mongoc, i-02fa6, instnum=6, Running' 

# a hash where we will save mongo types strings as keys 
# and number of occurence as values 
mtypes = {} 
data.lines.each do |ln| 
    # get first and second element of given string to inst and mtype respectively 
    inst, mtype = ln.split(',').map(&:strip)[0..1] 
    # check if mtypes hash has a key that equ current mtype 
    # if yes -> add 1 to current number of occurence 
    # if not -> create new key and assign 1 as a value to it 
    # this is a if ? true : false -- ternary operator 
    mtypes[mtype] = mtypes.has_key?(mtype) ? mtypes[mtype] + 1 : 1 
    # combine an output string (everything in #{ } is a variables 
    # so #{mtype}#{mtypes[mtype]} means take current value of mtype and 
    # place after it current number of occurence stored into mtypes hash 
    p "#{inst} : #{mtype}#{mtypes[mtype]}" 
end 

輸出：

# "ec2-23-22-59-32 : mongoc1" 
# "ec2-54-27-11-46 : mongod1" 
# "ec2-78-62-192-20 : mongod2" 
# "ec2-24-47-51-23 : mongos1" 
# "ec2-72-95-64-22 : mongos2" 
# "ec2-27-22-219-75 : mongoc2" 

相當strightforward我想。如果你不明白的東西 - 讓我知道。