method
extract!
v3.2.13 -
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Class: Hash
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extract!(*keys)
public
Removes and returns the key/value pairs matching the given keys.
{:a => 1, :b => 2, :c => 3, :d => 4}.extract!(:a, :b) # => {:a => 1, :b => 2}
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freemanoid321 -
September 8, 2013
0 thanks
without a bang
We can use hash#slice if we want an Hash#extract (without bang) like behavior.
matthewtuck -
August 13, 2014 - (>= v4.0.2)
0 thanks
Non-existent key semantics changed.
For Rails 4.0, the behaviour of this has changed when you pass a key that isn’t in the hash.
3.2 (undocumented):
{ a: 1, b: 2 }.extract!(:a, :x) # => {:a=>1, :x => nil}
4.0 (as per docs):
{ a: 1, b: 2 }.extract!(:a, :x) # => {:a=>1}
The 4.0 behaviour is now consistent with the behaviour of slice, the 3.2 behaviour was not.