Module: Enumerable

Defined in:
lib/lite/ruby/enumerable.rb

Instance Method Summary collapse

Instance Method Details

#cluster ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 5

def cluster
  each_with_object([]) do |ele, results|
    last_res = results.last

    if last_res && (yield(ele) == yield(last_res.last))
      last_res << ele
    else
      results << [ele]
    end
  end
end

#cluster_by(&block) ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 17

def cluster_by(&block)
  group_by(&block).sort.transpose.pop || []
end

#deduce(identity = 0, &block) ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 21

def deduce(identity = 0, &block)
  if block_given?
    map(&block).deduce(identity)
  else
    inject { |acc, val| acc - val } || identity
  end
end

#drop_last(num) ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 29

def drop_last(num)
  collection_size = to_a.size
  return self if num > collection_size

  self[0...(collection_size - num)]
end

#drop_last_if ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 36

def drop_last_if
  dropping = true
  reverse_each.with_object([]) do |val, arr|
    next if dropping &&= yield(val)

    arr.unshift(val)
  end
end

#exactly?(num) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lite/ruby/enumerable.rb', line 45

def exactly?(num)
  found_count = 0

  if block_given?
    each { |*opt| found_count += 1 if yield(*opt) }
  else
    each { |opt| found_count += 1 if opt }
  end

  found_count > num ? false : num == found_count
end

#excase?(object) ⇒ Boolean

rubocop:disable Style/CaseEquality

Returns:

  • (Boolean) 


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# File 'lib/lite/ruby/enumerable.rb', line 58

def excase?(object)
  none? { |val| object === val }
end

#exclude?(object) ⇒ Boolean

rubocop:enable Style/CaseEquality

Returns:

  • (Boolean) 


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# File 'lib/lite/ruby/enumerable.rb', line 63

def exclude?(object)
  !include?(object)
end

#expand ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 67

def expand
  map { |val| val.is_a?(Enumerable) ? val.expand : val }
end

#exponential(identity = 0, &block) ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 71

def exponential(identity = 0, &block)
  if block_given?
    map(&block).exponential(identity)
  else
    inject { |acc, val| acc**val } || identity
  end
end

#frequency ⇒ Object Also known as: occurrences 



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# File 'lib/lite/ruby/enumerable.rb', line 79

def frequency
  each_with_object(Hash.new(0)) { |val, hash| hash[val] += 1 }
end

#incase?(object) ⇒ Boolean

rubocop:disable Style/CaseEquality

Returns:

  • (Boolean) 


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# File 'lib/lite/ruby/enumerable.rb', line 86

def incase?(object)
  any? { |val| object === val }
end

#interpose(sep, &block) ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/lite/ruby/enumerable.rb', line 92

def interpose(sep, &block)
  enum = Enumerator.new do |val|
    items = each

    loop do
      begin
        val << items.next
      rescue StopIteration
        break
      end

      begin
        items.peek
      rescue StopIteration
        break
      else
        val << sep
      end
    end
  end

  block ? enum.each(&block) : enum
end

#many? ⇒ Boolean

rubocop:enable Metrics/MethodLength

Returns:

  • (Boolean) 


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# File 'lib/lite/ruby/enumerable.rb', line 117

def many?
  found_count = 0

  if block_given?
    any? do |val|
      found_count += 1 if yield(val)
      found_count > 1
    end
  else
    any? { (found_count += 1) > 1 }
  end
end

#modulate(modulo) ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 130

def modulate(modulo)
  if modulo == 1
    to_a
  elsif size % modulo != 0
    raise ArgumentError, "Invalid modulo: #{modulo.inspect}"
  else
    (0...size).each_with_object(Array.new(modulo, [])) do |i, array|
      array[i % modulo] += [self[i]]
    end
  end
end

#occur(amount = nil) ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/MethodLength



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# File 'lib/lite/ruby/enumerable.rb', line 143

def occur(amount = nil)
  result = Hash.new { |hash, key| hash[key] = [] }

  each do |item|
    key = item
    result[key] << item
  end

  if block_given?
    result.select! { |_key, values| yield(values.size) }
  else
    raise ArgumentError, 'Invalid occur amount' unless amount

    if amount.is_a?(Range)
      result.select! { |_key, values| amount.include?(values.size) }
    else
      result.select! { |_key, values| values.size == amount }
    end
  end

  result.values.flatten.uniq
end

#produce(identity = 0, &block) ⇒ Object

rubocop:enable Metrics/AbcSize, Metrics/MethodLength



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# File 'lib/lite/ruby/enumerable.rb', line 167

def produce(identity = 0, &block)
  if block_given?
    map(&block).produce(identity)
  else
    inject { |acc, val| acc * val } || identity
  end
end

#quotient(identity = 0, &block) ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 175

def quotient(identity = 0, &block)
  if block_given?
    map(&block).quotient(identity)
  else
    inject { |acc, val| acc / val } || identity
  end
end

#several? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lite/ruby/enumerable.rb', line 183

def several?
  found_count = 0

  if block_given?
    each { |*opt| found_count += 1 if yield(*opt) }
  else
    each { |opt| found_count += 1 if opt }
  end

  found_count > 1
end

#squeeze(*limited_to) ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/lite/ruby/enumerable.rb', line 196

def squeeze(*limited_to)
  first = true
  current = nil

  each_with_object([]) do |val, array|
    if !limited_to.empty? && !limited_to.include?(val)
      array << val
    elsif first || current != val
      array << val
      first = false
      current = val
    end
  end
end

#take_last(num) ⇒ Object

rubocop:enable Metrics/MethodLength



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# File 'lib/lite/ruby/enumerable.rb', line 212

def take_last(num)
  collection_size = to_a.size
  return self if num > collection_size

  self[(collection_size - num)..-1]
end

#take_last_if ⇒ Object 



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# File 'lib/lite/ruby/enumerable.rb', line 219

def take_last_if
  reverse_each.with_object([]) do |val, arr|
    break arr unless yield(val)

    arr.unshift(val)
  end
end