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Contents
# stolen originally from enumerable-extra
module Enumerable
# Returns a new array containing the results of running +method+ once for
# every element in the enumerable object. If both arguments and a block
# are provided the arguments are processed first, then passed to
# the block.
#
# If no method is provided, then it behaves as the standard MRI method.
#
# Examples:
#
# array = ['foo', 'bar']
#
# # No arguments
# array.map_by(:capitalize) => ['Foo', 'Bar']
#
def map_by(method)
array = []
method = method.to_sym unless method.is_a?(Symbol)
each{ |obj|
temp = obj.send(method)
array << temp
}
array
end
# Reset the aliases
alias collect_by map_by
end
class Array
# Returns a new array containing the results of running +block+ once for
# every element in the +array+.
#
# Examples:
#
# array = ['foo', 'bar']
#
# # No arguments
# array.map_by(:capitalize) => ['Foo', 'Bar']
#
# # With arguments and a block
# array.map_by(:capitalize)
#--
# The Array class actually has its own implementation of the +map+ method,
# hence the duplication.
#
def map_by(method)
array = []
method = method.to_sym unless method.is_a?(Symbol)
each{ |obj|
temp = obj.send(method)
array << temp
}
array
end
# Same as Array#map, but modifies the receiver in place. Also note that
# a block is _not_ required. If no block is given, an array of values
# is returned instead
#
def map_by!(method)
method = method.to_sym unless method.is_a?(Symbol)
i = 0
length = self.size
while(i < length)
self[i] = self[i].send(method)
i+=1
end
self
end
# Set the aliases
alias collect_by map_by
alias collect_by! map_by!
end
Version data entries
27 entries across 27 versions & 1 rubygems