Select from hash array based on values from other array

Question

I have these arrays. And i want to select only the instances with the :teacher value from the @teachers array and put them in @filtered_courses.

@teachers = ["KAP", "CWD"]
@courses = [
  {:gruppnamn=>"ESM15/15MUSINS01Str", :kurskod=>"MUSINS01S", :teacher=>"MWN", :class=>"ESM15", :points=>100.0, :kvot=>nil, :tim=>nil},
  {:gruppnamn=>"ESM15/15MUSMUS01", :kurskod=>"MUSMUS01", :teacher=>"KAP", :class=>"ESM15", :points=>100.0, :kvot=>nil, :tim=>nil},
  {:gruppnamn=>"Hälsostudion/15år2", :kurskod=>"IDRIDR01", :teacher=>"CWD", :class=>"ESSA", :points=>100.0, :kvot=>nil, :tim=>nil}
]

The method to select certain elements from an array is called select — Stefan
– Stefan, Commented Mar 21, 2016 at 11:32

Uri Agassi · Accepted Answer · 2016-03-21 11:32:59Z

3

Try:

@filtered_courses = @courses.select { |x| @teachers.include? x[:teacher] }
# => [{:gruppnamn=>"ESM15/15MUSMUS01", :kurskod=>"MUSMUS01", :teacher=>"KAP", :class=>"ESM15", :points=>100.0, :kvot=>nil, :tim=>nil},
#     {:gruppnamn=>"Hlsostudion/15r2", :kurskod=>"IDRIDR01", :teacher=>"CWD", :class=>"ESSA", :points=>100.0, :kvot=>nil, :tim=>nil}]

answered Mar 21, 2016 at 11:32

Uri Agassi

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1 Comment

Petter Over a year ago

Thanks! Solved it!

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