Ruby nested each do + array concatenation

Question

*newbie apologies..

The following code:

dates = ['Transaction_Date','Renewal_Date']
dateoptions = ['Year','Month','Date']
word1 = "Amount"

dates.each do |x|
  puts word1 + " by " + x
  end

Returns

Amount by Transaction_Date
Amount by Renewal_Date

I would like the outcome to be a concatenation of the dates and dateoptions, like so

Amount by Transaction_Date (Year)
Amount by Transaction_Date (Month)
Amount by Transaction_Date (Date)
Amount by Renewal_Date (Year)
Amount by Renewal_Date (Month)
Amount by Renewal_Date (Month)

I was thinking of doing a nested "each do" but I still wouldn't know how to address the concatenation of the two arrays.

Appreciate your input

falsetru · Accepted Answer · 2014-09-05 09:10:12Z

3

You need to use nested each:

dates = ['Transaction_Date','Renewal_Date']
dateoptions = ['Year','Month','Date']
word1 = "Amount"

dates.each do |d|
  dateoptions.each do |option|
    puts "#{word1} by #{d} (#{option})"
  end
end

Or you can use Array#product

dates.product(dateoptions) do |d, option|
  puts "#{word1} by #{d} (#{option})"
end

answered Sep 5, 2014 at 9:10

falsetru

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1 Comment

Hendrik Kleine Over a year ago

Perfect, both options help me a lot. Thank you @falsetru

Marek Lipka · Accepted Answer · 2014-09-05 09:10:58Z

2

You can use Array#product method:

dates.product(dateoptions).each do |date, option|
  puts "#{word1} by #{date} (#{option})"
end

answered Sep 5, 2014 at 9:10

Marek Lipka

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Comments

Nitin · Accepted Answer · 2014-09-05 09:11:35Z

0

dates = ['Transaction_Date','Renewal_Date']
dateoptions = ['Year','Month','Date']
word1 = "Amount"

dates.each do |x|
  dateoptions.each do |y|
    puts "#{word1} by #{x} (#{y})"
  end
end

answered Sep 5, 2014 at 9:11

Nitin

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Comments

pangpang · Accepted Answer · 2014-09-05 09:12:59Z

0

2.1.2 :009 > dates.each do |e|
2.1.2 :010 >     dateoptions.each do |o|
2.1.2 :011 >       puts "#{word1} by #{e} (#{o})"
2.1.2 :012?>     end
2.1.2 :013?>   end
Amount by Transaction_Date (Year)
Amount by Transaction_Date (Month)
Amount by Transaction_Date (Date)
Amount by Renewal_Date (Year)
Amount by Renewal_Date (Month)
Amount by Renewal_Date (Date)

answered Sep 5, 2014 at 9:12

pangpang

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