Class: Array

Inherits:
Object show all
Defined in:
lib/rext/array/helpers.rb

Instance Method Summary collapse

Instance Method Details

#avg ⇒ Object Also known as: average

Return the average of numbers within the array.



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# File 'lib/rext/array/helpers.rb', line 16

def avg
  return 0 if empty?
  sum.to_f / length
end

#chunk(n, pad_with = nil, &block) ⇒ Object Also known as: in_groups_of

Split an array into chunks of length n. Optionally you may pad_with an object to retain a uniform length per chunk.

Examples

[1,2,3].chunk(2)         # => [[1,2], [3, nil]]
[1,2,3].chunk(2, 'x')    # => [[1,2], [3, 'x']]
[1,2,3].chunk(2, false)  # => [[1,2], [3]]
[1,2,3].in_groups_of(2) do |chunk|
  # Do something
end

See

  • Array#pad



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# File 'lib/rext/array/helpers.rb', line 69

def chunk n, pad_with = nil, &block
  returning [] do |chunks|
    each_slice n do |chunk|
      chunk.pad n, pad_with unless pad_with == false
      yield chunk if block
      chunks << chunk
    end
  end
end

#from(index) ⇒ Object

Return array of elements after index.



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# File 'lib/rext/array/helpers.rb', line 25

def from index
  self[index..-1]
end

#pad(n, pad_with = nil) ⇒ Object

Pad array with expected length n, and pad_with an optional object or nil.

Examples

[1,2].pad(4)  # => [1,2,nil,nil]
[1,2].pad(4)  # => [1,2,'x','x']
[1,2].pad(2)  # => [1,2]



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# File 'lib/rext/array/helpers.rb', line 47

def pad n, pad_with = nil
  fill pad_with, length, n - length
end

#sum ⇒ Object

Return the sum of numbers within the array.



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# File 'lib/rext/array/helpers.rb', line 9

def sum
  inject(0) { |sum, n| sum += n }
end

#to(index) ⇒ Object

Return array of elements up to index.



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# File 'lib/rext/array/helpers.rb', line 32

def to index
  self[0..index]
end