Class: Hash

Inherits:
Object show all
Defined in:
lib/babushka/core_patches/hash.rb

Instance Method Summary collapse

Instance Method Details

#defaults(other) ⇒ Object

Return a new hash consisting of other reverse-merged into this hash; that is, equal to other.merge(self).


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# File 'lib/babushka/core_patches/hash.rb', line 39

def defaults other
  Babushka::LogHelpers.deprecated! '2017-09-01', instead: '#merge the other way around'
  dup.defaults! other
end

#defaults!(other) ⇒ Object

Reverse-merge other into this hash in-place; that is, merge all key-value pairs in other whose keys are not already present in self.


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# File 'lib/babushka/core_patches/hash.rb', line 32

def defaults! other
  Babushka::LogHelpers.deprecated! '2017-09-01', instead: '#merge! the other way around'
  replace other.merge(self)
end

#discard(*keys) ⇒ Object

Return a new hash filtered to exclude any key-value pairs whose keys appear in keys.


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# File 'lib/babushka/core_patches/hash.rb', line 4

def discard *keys
  dup.discard!(*keys)
end

#discard!(*keys) ⇒ Object

Filter this hash in-place so any key-value pairs whose keys appear in keys are removed.


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# File 'lib/babushka/core_patches/hash.rb', line 10

def discard! *keys
  keys.each {|k| delete k }
  self
end

#map_values(&block) ⇒ Object

Return a new hash with the same keys as this hash, but with values generated by yielding each key-value pair to block.


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# File 'lib/babushka/core_patches/hash.rb', line 46

def map_values &block
  keys.inject({}) {|acc,k|
    acc[k] = yield(k, self[k])
    acc
  }
end

#selekt(&block) ⇒ Object

Return a new hash filtered to contain just the key-value pairs for which the block returns true. That is, like Hash#select, but returning a hash instead of an array of tuples.


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# File 'lib/babushka/core_patches/hash.rb', line 56

def selekt &block
  Babushka::LogHelpers.deprecated! '2017-09-01', instead: '#select'
  hsh = {}
  each_pair {|k,v|
    hsh[k] = v if yield(k,v)
  }
  hsh
end

#slice(*keys) ⇒ Object

Return a new hash filtered to contain only the key-value pairs whose keys appear in keys.


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# File 'lib/babushka/core_patches/hash.rb', line 17

def slice *keys
  dup.slice!(*keys)
end

#slice!(*keys) ⇒ Object

Filter this hash in-place so it contains only the key-value pairs whose keys appear in keys.


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# File 'lib/babushka/core_patches/hash.rb', line 23

def slice! *keys
  keys.inject({}) {|acc,key|
    acc[key] = self.delete(key) if self.has_key?(key)
    acc
  }
end