Module: Ruwi::Utils::Arrays

Defined in:
lib/ruwi/runtime/utils/arrays.rb

Defined Under Namespace

Classes: ArrayWithOriginalIndices

Class Method Summary collapse

Class Method Details

.diff(old_array, new_array) ⇒ Hash

Returns Hash containing added and removed items.

Parameters:

  • old_array (Array)
  • new_array (Array)

Returns:

  • (Hash) —

    Hash containing added and removed items



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# File 'lib/ruwi/runtime/utils/arrays.rb', line 15

def self.diff(old_array, new_array)
  {
    added: (new_array - old_array).uniq,
    removed: (old_array - new_array).uniq
  }
end

.diff_sequence(old_array, new_array, equal_proc = ->(a, b) { a == b }) ⇒ Array

Returns sequence of operations to transform old_array into new_array.

Parameters:

  • old_array (Array)
  • new_array (Array)
  • equal_proc (Proc) (defaults to: ->(a, b) { a == b })

Returns:

  • (Array) —

    sequence of operations to transform old_array into new_array



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# File 'lib/ruwi/runtime/utils/arrays.rb', line 150

def self.diff_sequence(old_array, new_array, equal_proc = ->(a, b) { a == b })
  sequence = []
  array = ArrayWithOriginalIndices.new(old_array, equal_proc)

  index = 0
  while index < new_array.length
    if array.is_removal?(index, new_array)
      sequence << array.remove_item(index)
      next
    end

    if array.is_noop?(index, new_array)
      sequence << array.noop_item(index)
      index += 1
      next
    end

    item = new_array[index]

    if array.is_addition?(item, index)
      sequence << array.add_item(item, index)
      index += 1
      next
    end

    sequence << array.move_item(item, index)
    index += 1
  end

  sequence.concat(array.remove_item_after(new_array.length))

  sequence
end

.without_nulls(arr) ⇒ Array

Parameters:

  • arr (Array)

Returns:

  • (Array) 


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# File 'lib/ruwi/runtime/utils/arrays.rb', line 8

def self.without_nulls(arr)
  arr.reject { |item| item.nil? }
end