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Contents
require 'enumerator'
class Array
##
# Return array of elements after +position+.
def from position
self[position..-1]
end
##
# Return array of elements up to +position+.
def to position
self[0..position]
end
##
# 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]
#
def pad n, pad_with = nil
fill pad_with, length, n - length
end
##
# 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
#
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
alias :in_groups_of :chunk
end
Version data entries
8 entries across 8 versions & 2 rubygems