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Contents
module DataMapper; module Ext
module Hash
# Creates a hash with *only* the specified key/value pairs from +hash+.
#
# @param [Hash] hash The hash from which to pick the key/value pairs.
# @param [Array] *keys The hash keys to include.
#
# @return [Hash] A new hash with only the selected keys.
#
# @example
# hash = { :one => 1, :two => 2, :three => 3 }
# Ext::Hash.only(hash, :one, :two) # => { :one => 1, :two => 2 }
#
# @api semipublic
def self.only(hash, *keys)
h = {}
keys.each {|k| h[k] = hash[k] if hash.has_key?(k) }
h
end
# Returns a hash that includes everything but the given +keys+.
#
# @param [Hash] hash The hash from which to pick the key/value pairs.
# @param [Array] *keys The hash keys to exclude.
#
# @return [Hash] A new hash without the specified keys.
#
# @example
# hash = { :one => 1, :two => 2, :three => 3 }
# Ext::Hash.except(hash, :one, :two) # => { :three => 3 }
#
# @api semipublic
def self.except(hash, *keys)
self.except!(hash.dup, *keys)
end
# Removes the specified +keys+ from the given +hash+.
#
# @param [Hash] hash The hash to modify.
# @param [Array] *keys The hash keys to exclude.
#
# @return [Hash] +hash+
#
# @example
# hash = { :one => 1, :two => 2, :three => 3 }
# Ext::Hash.except!(hash, :one, :two)
# hash # => { :three => 3 }
#
# @api semipublic
def self.except!(hash, *keys)
keys.each { |key| hash.delete(key) }
hash
end
# Converts the specified +hash+ to a {Mash}.
#
# @param [Hash] hash The hash to convert.
# @return [Mash] The {Mash} for the specified +hash+.
#
# @api semipublic
def self.to_mash(hash)
h = Mash.new(hash)
h.default = hash.default
h
end
end
end; end
Version data entries
11 entries across 11 versions & 4 rubygems