1. Deep copy When you copy an object that contains other objects, like an Array, only a reference to these objects is copied. You can see that in action here:
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food = %w( bread milk orange ) food.map(&:object_id) # [35401044, 35401020, 35400996] food.clone.map(&:object_id) # [35401044, 35401020, 35400996] |
Using the Marshal class, which is normally used for serialization, you can create a ‘deep copy’ of an object.
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def deep_copy(obj) Marshal.load(Marshal.dump(obj)) end |
The results:
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deep_copy(food).map(&:object_id) # [42975648, 42975624, 42975612] |
2. […]
Understanding Blocks Blocks are very prevalent in Ruby, you can think of them as little anonymous functions that can be passed into methods. Blocks are enclosed in a do / end statement or between brackets {}, and they can have multiple arguments. The argument names are defined between two pipe | characters. If you have […]