setting ruby hash .default to a list
- by matpalm
i thought i understood what the default method does to a hash...
give a default value for a key if it doesn't exist
irb(main):001:0> a = {}
=> {}
irb(main):002:0> a.default = 4
=> 4
irb(main):003:0> a[8]
=> 4
irb(main):004:0> a[9] += 1
=> 5
irb(main):005:0> a
=> {9=>5}
all good.
but if i set the default to be a empty list, or empty hash, i dont understand it's behaviour at all....
irb(main):001:0> a = {}
=> {}
irb(main):002:0> a.default = []
=> []
irb(main):003:0> a[8] << 9
=> [9] # great!
irb(main):004:0> a
=> {} # ?! would have expected {8=>[9]}
irb(main):005:0> a[8]
=> [8] # awesome!
irb(main):006:0> a[9]
=> [9] # unawesome! shouldn't this be [] ??
i was hoping / expecting the same behaviour as if i had used the ||= operator...
irb(main):001:0> a = {}
=> {}
irb(main):002:0> a[8] ||= []
=> []
irb(main):003:0> a[8] << 9
=> [9]
irb(main):004:0> a
=> {8=>[9]}
irb(main):005:0> a[9]
=> nil
can anyone explain what is going on ???
