Class: Hash

Inherits:
Object show all
Defined in:
lib/croesus/core_ext/hash.rb,
lib/croesus/core_ext/blank.rb

Overview

Add #blank? method to Hash class.

Defined Under Namespace

Classes: UndefinedPathError

Instance Method Summary collapse

Instance Method Details

#capitalize_keys ⇒ Hash

Returns a new hash with all keys converted to strings and the first letter capitalized.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 118

def capitalize_keys
  transform_keys { |key| key.Upcase.to_s.capitalize rescue key }
end

#compact ⇒ Hash

Returns a compacted copy (contains no key/value pairs having nil? values)

Examples:

hash = { a: 100, b: nil, c: false, d: '' }
hash.compact # => { a: 100, c: false, d: '' }
hash         # => { a: 100, b: nil, c: false, d: '' }

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 31

def compact
  select { |_, value| !value.nil? }
end

#normalize_keys ⇒ Hash

Returns a new hash with all keys downcased and converted to symbols.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 68

def normalize_keys
  transform_keys { |key| key.downcase.to_sym rescue key }
end

#recursive_fetch(*args, &block) ⇒ Hash, ...

Recursively searchs a nested datastructure for a key and returns the value. If a block is provided its value will be returned if the key does not exist

Examples:

options = { server: { location: { row: { rack: 34 } } } }
options.recursive_fetch :server, :location, :row, :rack
            # => 34
options.recursive_fetch(:non_existent_key) { 'default' }
            # => "default"

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 145

def recursive_fetch(*args, &block)
  args.reduce(self) do |obj, arg|
    begin
      arg = Integer(arg) if obj.is_a? Array
      obj.fetch(arg)
    rescue ArgumentError, IndexError, NoMethodError => e
      break block.call(arg) if block
      raise UndefinedPathError, "Could not fetch path (#{args.join(' > ')}) at #{arg}", e.backtrace
    end
  end
end

#recursive_merge(other) ⇒ Object 



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# File 'lib/croesus/core_ext/hash.rb', line 157

def recursive_merge(other)
  hash = self.dup
  other.each do |key, value|
    myval = self[key]
    if value.is_a?(Hash) && myval.is_a?(Hash)
      hash[key] = myval.recursive_merge(value)
    else
      hash[key] = value
    end
  end
  hash
end

#recursively_capitalize_key ⇒ Hash

Returns a new Hash, recursively converting all keys to strings and the first letter capitalized.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 127

def recursively_capitalize_key
  recursively_transform_keys { |key| key.to_s.capitalize rescue key }
end

#recursively_normalize_keys ⇒ Hash

Returns a new Hash, recursively downcasing and converting all keys to symbols.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 77

def recursively_normalize_keys
  recursively_transform_keys { |key| key.downcase.to_sym rescue key }
end

#recursively_stringify_key ⇒ Hash

Returns a new Hash, recursively converting all keys to strings.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 109

def recursively_stringify_key
  recursively_transform_keys { |key| key.to_s rescue key }
end

#recursively_symbolize_keys ⇒ Hash

Returns a new Hash, recursively converting all keys to symbols.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 93

def recursively_symbolize_keys
  recursively_transform_keys { |key| key.to_sym rescue key }
end

#recursively_transform_keys(&block) ⇒ Hash

Returns a new hash, recursively converting all keys by the block operation.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 59

def recursively_transform_keys(&block)
  _recursively_transform_keys_in_object(self, &block)
end

#stringify_keys ⇒ Hash

Returns a new hash with all keys converted to strings.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 101

def stringify_keys
  transform_keys { |key| key.to_s rescue key }
end

#symbolize_keys ⇒ Hash

Returns a new hash with all keys converted to symbols.

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 85

def symbolize_keys
  transform_keys { |key| key.to_sym rescue key }
end

#transform_keys ⇒ Hash

Returns a new hash with all keys converted using the block operation.

Examples:

hash = { name: 'Tiggy', age: '15' }

hash.transform_keys{ |key| key.to_s.upcase }
            # => { "AGE" => "15", "NAME" => "Tiggy" }

Returns:



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# File 'lib/croesus/core_ext/hash.rb', line 45

def transform_keys
  enum_for(:transform_keys) unless block_given?
  result = self.class.new
  each_key do |key|
    result[yield(key)] = self[key]
  end
  result
end