Bang (!)

TODO

  • Bang vs no bang.
tip

When the origional variable is manipulated, the method shout with a bang:

Sort no bang#

[80] pry(main)> arr.sort
=> [1, 2, 3, 4, 6, 7, 11]
[81] pry(main)> arr
=> [4, 1, 7, 3, 6, 11, 2]

Sort with bang: In place#

[79] pry(main)> arr = [4,1,7,3,6,11,2]
=> [4, 1, 7, 3, 6, 11, 2]
[82] pry(main)> arr.sort!
=> [1, 2, 3, 4, 6, 7, 11]
[83] pry(main)> arr
=> [1, 2, 3, 4, 6, 7, 11]

Bang on activerecord methods#

  • user.update vs user.update!
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