Sha256: 68acadef30c1b159f739411a45e5dd5d65bfd44721d0f1b726631aee6ac91110
Contents?: true
Size: 1.55 KB
Versions: 7
Compression:
Stored size: 1.55 KB
Contents
class Hash
# Slice a hash to include only the given keys. This is useful for
# limiting an options hash to valid keys before passing to a method:
#
# def search(criteria = {})
# assert_valid_keys(:mass, :velocity, :time)
# end
#
# search(options.slice(:mass, :velocity, :time))
#
# If you have an array of keys you want to limit to, you should splat them:
#
# valid_keys = [:mass, :velocity, :time]
# search(options.slice(*valid_keys))
def slice(*keys)
keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
hash = self.class.new
keys.each { |k| hash[k] = self[k] if has_key?(k) }
hash
end unless method_defined?(:slice)
# Replaces the hash with only the given keys.
# Returns a hash containing the removed key/value pairs
# @example
# hsh = {:a => 1, :b => 2, :c => 3, :d => 4}
# hsh.slice!(:a, :b)
# # => {:c => 3, :d =>4}
# hsh
# # => {:a => 1, :b => 2}
def slice!(*keys)
keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
omit = slice(*self.keys - keys)
hash = slice(*keys)
replace(hash)
omit
end unless method_defined?(:slice!)
# Removes the given keys from the hash
# Returns a hash containing the removed key/value pairs
#
# @example
# hsh = {:a => 1, :b => 2, :c => 3, :d => 4}
# hsh.extract!(:a, :b)
# # => {:a => 1, :b => 2}
# hsh
# # => {:c => 3, :d =>4}
def extract!(*keys)
result = {}
keys.each {|key| result[key] = delete(key) }
result
end unless method_defined?(:extract!)
end
Version data entries
7 entries across 7 versions & 1 rubygems