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=begin rdoc
Array extensions
=end
require "enumerator"
class Array
def collect_with_index &block
self.enum_for(:each_with_index).collect &block
end
# Example nodes.select_with_hash(:status=>'running')
def select_with_hash(conditions={})
return self if conditions.empty?
select do |node|
conditions.any? do |k,v|
( node.has_key?(k) && node[k]==v ) or ( node.respond_to?(k) && node.send(k)==v )
end
end
end
def wrapping_next(id)
raise "Element #{id} not in array" unless index(id)
index(id) >= size-1 ? at(0) : at(index(id)+1)
end
# Swap elements of an array
def swap!(a,b)
self[a], self[b] = self[b], self[a]
self
end
# Rotate an array
# Example:
# arr = %w(a b c d e f)
# arr2 = arr.clone.rotate
#
# arr.zip(arr2) =>
# [["a", "b"], ["b", "c"], ["c", "d"], ["d", "e"], ["e", "f"], ["f", "a"]]
def rotate
push shift
end
def zip_offset(offset=0)
arr2 = self.dup
out = []
self.each_with_index do |ele,i|
break if i == (self.size - offset)
out[i] = [ele, arr2[i+1]]
end
out
end
end
Version data entries
28 entries across 28 versions & 3 rubygems