Sha256: 13095e30a0eece8e24678e6ae9fa1dcf60d0d5be15e8bfd61fd94b3eb99d3d45
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Size: 1.13 KB
Versions: 54
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Stored size: 1.13 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
# Replaces the hash with only the given keys.
# Returns a hash contained the removed key/value pairs
# {:a => 1, :b => 2, :c => 3, :d => 4}.slice!(:a, :b) # => {:c => 3, :d =>4}
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
def extract!(*keys)
result = {}
keys.each {|key| result[key] = delete(key) }
result
end
end
Version data entries
54 entries across 54 versions & 4 rubygems