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  1. Prepare
  2. Ruby
  3. Enumerables
  4. Ruby - Enumerable - each_with_index
  5. Discussions

Ruby - Enumerable - each_with_index

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  • mark_elliott_uky
     + 0 comments
    First test answer: ["3:panda", "4:tiger", "5:deer"]

    def skip_animals(animals, skip)
    animals[skip..-1].each_with_index.map {|v,i| "#{i+skip}:#{v}" }
end

  • mariocfbais
     + 0 comments
    def skip_animals(animals, skip)
  # Your code here
    animals.enum_for(:each_with_index).select { |v, i| i >= skip }.map { |v, i| "#{i}:#{v}"}
end

  • ormsorms369
     + 0 comments

    Compiled Answer

    https://github.com/LinaOrmos/Ruby/blob/main/Enumerable%20-%20each%20with%20index%20HackerRank

  • nickcameron
     + 0 comments

    The challenge statement, here:

    your task is to complete the skip_animals method that takes an animals array and a skip integer and returns an array of all elements except first skip number of items as shown in the example below.

    doesn't exactly explain what the skip_animals method is supposed to do—you have to return an array of the elements with the indices prefixed like the example shows.

    I've noticed a lot of the Ruby challenges hide parts of the source code from you, and I think it can be useful to see everything that's being run to help learn even more about the language. Luckily, with File.read(__FILE__) we can see the full source code.

    The full source code for this challenge is as follows.

    def skip_animals(animals, skip)
    # Your code here
end

a1 = ['bat', 'cow', 'jaguar', 'panda', 'tiger', 'deer']
a2 = ['leopard', 'bear', 'fox', 'wolf', 'dog', 'cat']

def _print_animals(animals, skip)
  animals_ = []
  animals.each_with_index do |item, index|
    next if index < skip
    animals_.push("#{index}:#{item}")
  end
  animals_
end

user_result1 = skip_animals(a1, 3)
user_result2 = skip_animals(a2, 0)
test_result1 = _print_animals(a1, 3)
test_result2 = _print_animals(a2, 0)

if not (user_result1.is_a? Array and user_result2.is_a? Array)
  puts 'Your method must return an array.'
  exit(0)
end

if (user_result1 != test_result1) or (user_result2 != test_result2)
  puts 'Wrong! Please check the return value of your program.'
  exit(0)
end

puts 'Correct! You have a good understanding of Ruby.'

  • riaa_b16
     + 1 comment

    Whats wrong with my code?

    def skip_animals(animals, skip)
  # Your code here
    arr=Array.new
   animals.each_with_index { |item, index| arr.push("#{index+1}:#{item}") if index>=skip } 
    arr
end