Class: Hash

Inherits:
Object show all
Defined in:
lib/mug/bool.rb,
lib/mug/hashop.rb,
lib/mug/hashmap.rb

Instance Method Summary collapse

Instance Method Details

#<<(o) ⇒ Object

Appends stuff to the hash.

If o is a Hash, this is identical to calling #merge! If o is an Array with two elements, it is interpreted as [key,value] If o can be converted to a hash with #to_h, this is identical to calling #merge! Otherwise an ArgumentError is raised.



27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/mug/hashop.rb', line 27

def << o
	if o.respond_to? :to_hash
		merge! o.to_hash
	elsif o.respond_to?(:to_a) && (a = o.to_a) && a.length == 2
		store a[0], a[1]
	elsif o.respond_to? :to_h
		merge! o.to_h
	else
		raise ArgumentError, "#{o.class.name} is not a Hash"
	end
end

#map_keys(&block) ⇒ Object

Returns a new hash which is a copy of the current hash but each key is replaced by the result of running it through block.

If block returns duplicate keys, they will be overwritten in the resulting hash.

{'a'=>1, 'b'=>2}.map_keys { |k| k*2 } #=> {'aa'=>1, 'bb'=>2}
{'a'=>1, 'b'=>2}.map_keys { "cat" }   #=> {'cat'=>2}



37
38
39
40
41
42
43
 
# File 'lib/mug/hashmap.rb', line 37

def map_keys &block # :yields: key
	hsh = {}
	each do |k, v|
		hsh[ yield k ] = v
	end
	hsh
end

#map_keys!(&block) ⇒ Object

Replaces the keys in hsh by running them each through block.

If block returns duplicate keys, they will be overwritten in turn.

See: #map_keys



52
53
54
 
# File 'lib/mug/hashmap.rb', line 52

def map_keys! &block # :yields: key
	replace map_keys(&block)
end

#map_pairs(&block) ⇒ Object

Returns a new hash which is a copy of the current hash but each key-value pair is replaced by the result of running it through block.

If block returns duplicate keys, they will be overwritten in the resulting hash.

{'a'=>1, 'b'=>2}.map_pairs { |k,v| [k*2, v+1] } #=> {'aa'=>2, 'bb'=>3}
{'a'=>1, 'b'=>2}.map_pairs { ["cat","dog"] }   #=> {'cat'=>'dog'}



66
67
68
69
70
71
72
73
 
# File 'lib/mug/hashmap.rb', line 66

def map_pairs &block # :yields: key, value
	hsh = {}
	each do |k, v|
		a, b = yield k, v
		hsh[a] = b
	end
	hsh
end

#map_pairs!(&block) ⇒ Object

Replaces the values in hsh by running them each through block.

See: #map_values



80
81
82
 
# File 'lib/mug/hashmap.rb', line 80

def map_pairs! &block # :yields: key, value
	replace map_pairs(&block)
end

#map_values(&block) ⇒ Object

Returns a new hash which is a copy of the current hash but each value is replaced by the result of running it through block.

{'a'=>1, 'b'=>2}.map_values { |v| v*2 } #=> {'a'=>2, 'b'=>4}
{'a'=>1, 'b'=>2}.map_values { "cat" }   #=> {'a'=>"cat", 'b'=>"cat"}



10
11
12
13
14
15
16
 
# File 'lib/mug/hashmap.rb', line 10

def map_values &block # :yields: value
	hsh = {}
	each do |k, v|
		hsh[k] = yield v
	end
	hsh
end

#map_values!(&block) ⇒ Object

Replaces the values in hsh by running them each through block.

See: #map_values



23
24
25
 
# File 'lib/mug/hashmap.rb', line 23

def map_values! &block # :yields: value
	replace map_values(&block)
end

#to_b ⇒ Object

Converts hsh to a boolean. Returns true if not empty.



76
77
78
 
# File 'lib/mug/bool.rb', line 76

def to_b
	!empty?
end

#|(o) ⇒ Object

Returns a new Hash, whose value is the same as this one, with any extras in o added in.

Useful for default options.

Example:

opts = {:a => 1, :b => 2 }
dflt = {:a => 0, :x => 9 }
opts |= dflt # => opts = {:a=>1, :b=>2, :x=>9}



15
16
17
 
# File 'lib/mug/hashop.rb', line 15

def | o
	o.merge self
end