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array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]

[['X','X','X',4,5],[7,8,9,10],[11,12,13,14]]

array1.collect! do |i| 

  if i.include?(@student_ids) #

    i[i.index(@student_ids)] = 'X'; i # I want to replace all with X

  else

    i

  end

end

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]

[['X','X','X',4,5],[7,8,9,10],[11,12,13,14]]

array1.collect! do |i| 

  if i.include?(@student_ids) #

    i[i.index(@student_ids)] = 'X'; i # I want to replace all with X

  else

    i

  end

end

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]

[['X','X','X',4,5],[7,8,9,10],[11,12,13,14]]

array1.collect! do |i| 

  if i.include?(@student_ids) #

    i[i.index(@student_ids)] = 'X'; i # I want to replace all with X

  else

    i

  end

end

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]

[['X','X','X',4,5],[7,8,9,10],[11,12,13,14]]

array1.collect! do |i| 

  if i.include?(@student_ids) #

    i[i.index(@student_ids)] = 'X'; i # I want to replace all with X

  else

    i

  end

end

add a comment | 

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arr = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

ids = [1,2,3]

h = ids.product(["X"]).to_h

  #=> {1=>"X", 2=>"X", 3=>"X"}

arr.map { |a| a.map { |n| h.fetch(n, n) } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

require 'set'



ids = ids.to_set

  #=> #<Set: {1, 2, 3}>

arr.map { |a| a.map { |n| ids.include?(n) ? "X" : n } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

arr = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

ids = [1,2,3]

h = ids.product(["X"]).to_h

  #=> {1=>"X", 2=>"X", 3=>"X"}

arr.map { |a| a.map { |n| h.fetch(n, n) } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

require 'set'



ids = ids.to_set

  #=> #<Set: {1, 2, 3}>

arr.map { |a| a.map { |n| ids.include?(n) ? "X" : n } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

arr = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

ids = [1,2,3]

h = ids.product(["X"]).to_h

  #=> {1=>"X", 2=>"X", 3=>"X"}

arr.map { |a| a.map { |n| h.fetch(n, n) } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

require 'set'



ids = ids.to_set

  #=> #<Set: {1, 2, 3}>

arr.map { |a| a.map { |n| ids.include?(n) ? "X" : n } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

arr = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

ids = [1,2,3]

h = ids.product(["X"]).to_h

  #=> {1=>"X", 2=>"X", 3=>"X"}

arr.map { |a| a.map { |n| h.fetch(n, n) } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

require 'set'



ids = ids.to_set

  #=> #<Set: {1, 2, 3}>

arr.map { |a| a.map { |n| ids.include?(n) ? "X" : n } }

  #=> [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]]

add a comment | 

array1.inject() { |m,a| m << a.map { |x| @student_ids.include?(x) ? 'X' : x } }



# => [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]] 

array1.inject() { |m,a| m << a.map { |x| @student_ids.include?(x) ? 'X' : x } }



# => [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]] 

array1.inject() { |m,a| m << a.map { |x| @student_ids.include?(x) ? 'X' : x } }



# => [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]] 

array1.inject() { |m,a| m << a.map { |x| @student_ids.include?(x) ? 'X' : x } }



# => [["X", "X", "X", 4, 5], [7, 8, 9, 10], [11, 12, 13, 14]] 

add a comment | 

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]



array1.each_with_index do |sub_array, index|

  sub_array.each_with_index do |item, index2|

    array1[index][index2] = 'X' if @student_ids.include?(item)

  end

end

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]



array1.each_with_index do |sub_array, index|

  sub_array.each_with_index do |item, index2|

    array1[index][index2] = 'X' if @student_ids.include?(item)

  end

end

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]



array1.each_with_index do |sub_array, index|

  sub_array.each_with_index do |item, index2|

    array1[index][index2] = 'X' if @student_ids.include?(item)

  end

end

array1 = [[1,2,3,4,5],[7,8,9,10],[11,12,13,14]]

@student_ids = [1,2,3]



array1.each_with_index do |sub_array, index|

  sub_array.each_with_index do |item, index2|

    array1[index][index2] = 'X' if @student_ids.include?(item)

  end

end

add a comment | 

def remove_student_ids(arr)

  arr.each_with_index do |value, index| 

   arr[index] = 'X' if @student_ids.include?(value) }

  end

end



array1.map{ |sub_arr| remove_student_ids(sub_arr)}

def remove_student_ids(arr)

  arr.each_with_index do |value, index| 

   arr[index] = 'X' if @student_ids.include?(value) }

  end

end



array1.map{ |sub_arr| remove_student_ids(sub_arr)}

def remove_student_ids(arr)

  arr.each_with_index do |value, index| 

   arr[index] = 'X' if @student_ids.include?(value) }

  end

end



array1.map{ |sub_arr| remove_student_ids(sub_arr)}

def remove_student_ids(arr)

  arr.each_with_index do |value, index| 

   arr[index] = 'X' if @student_ids.include?(value) }

  end

end



array1.map{ |sub_arr| remove_student_ids(sub_arr)}

add a comment |