Method: Hash#slice

Defined in:

lib/nutella/core_ext/hash.rb

#slice(*keys) ⇒ Hash Also known as: grab

Grab the given keys out of a hash.

Examples:

Selects two keys out of a hash

{ a: 1, b: 2, c: 3, d: 4 }.slice :a, :c  # => { a: 1, c: 3 }

Limits an options hash to valid keys before passing to a method

def search(criteria = {})
  criteria.assert_valid_keys(:mass, :velocity, :time)
end

search(options.slice(:mass, :velocity, :time))def slice(*keys)

Splats an array of keys before passing to the #search method above

valid_keys = [:mass, :velocity, :time]
search(options.slice(*valid_keys))

Parameters:

• keys (*Object) —

  the keys to slice out of the hash

Returns:

• (Hash) —

  the key/value pairs that exist in *keys

# File 'lib/nutella/core_ext/hash.rb', line 20

def slice(*keys)
  select { |k, v| keys.include? k }
end