How can I remove the same values from an array?

Question

I am trying to create a calendar list in Ruby on Rails

I created a date range:

date_range = [['Feb 10', 'Feb 11'], ['Feb 11', 'Feb 12'], ['Feb 10', 'Feb 11', 'Feb 12']]

I ran this code:

date_range.each do |day|
  for daytime in day
    puts daytime
  end
end

The output is:

Feb 10 Feb 11 Feb 11 Feb 12 Feb 10 Feb 11 Feb 12

How can I display just:

Feb 10 Feb 11 Feb 12

Apart from the syntax, your date_range seems to be an array of date pairs (i.e. a 2D array), whereas your output shows single dates. Could you explain that? — Stefan
– Stefan, Commented Feb 14, 2016 at 9:34

Yam Marcovic · Accepted Answer · 2016-02-14 10:58:01Z

5

To specifically get the result you're after, how about

date_range.flatten.uniq.zip

edited Feb 14, 2016 at 10:58

answered Feb 14, 2016 at 9:48

Yam Marcovic

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6 Comments

sawa Over a year ago

I don't know if sort was necessary.

Yam Marcovic Over a year ago

@sawa Yeah, in his example it wasn't. I just wanted to give something a bit more robust.

Yam Marcovic Over a year ago

@sawa I don't know too much about Rails and its use cases. Would you recommend removing the sort?

sawa Over a year ago

It depends on his intention (it may already be sorted). But since it is not asked, I think it is safer not to add your interpretation.

Champer Wu Over a year ago

This code can let date_range = ["Feb 10","Feb 11","Feb 12"],but it can't use for loop to print every date bar. I got an error undefined method each for #<Post:0x007fe7ef0b0d18>

|

Wand Maker · Accepted Answer · 2016-02-14 15:40:24Z

2

Here is one more way to do this (with straight face):

date_range.reduce(:|)
#=> ["Feb 10", "Feb 11", "Feb 12"]

edited Feb 14, 2016 at 15:40

answered Feb 14, 2016 at 14:40

Wand Maker

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