Created
November 12, 2011 01:01
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Dumb monkeypatch for Hash
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| class Hash | |
| def diff(this) | |
| self.dup.delete_if { |key, val| | |
| this[key] == val | |
| }.merge(this.dup.delete_if { |key, val| self.has_key?(key) } ) | |
| end | |
| end |
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(Ab)used like this:
main> {a: :a, b: :b }.diff({a: :b})
=> {:a=>:a, :b=>:b}
main> {a: :a, b: :b }.diff({a: :a})
=> {:b=>:b}
main> {a: :a, b: :b }.diff({a: :a, b: :b})
=> {}
main> {a: :a, b: :b }.diff({a: :a, b: :b}).size
=> 0
main> {a: :a, b: :b }.diff({a: :a, b: 1}).size
=> 1