I need hash like:
name[13][:sub_param1] name[13][:sub_param2]
I've tried:
name = {13: {sub_param1 => 123}}
But it is only possible if 13: is '13': (string)
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1 Answer
I'm not sure what you're doing here, but this works:
name = { 13 => { sub_param1: 123 } }
Note that using the x: notation means that the keys are forced to symbols. If you need to use more exotic key types, which is allowed, you must use the arrow.
6 Comments
lurker
Good catch. And looks like the ability to use pure integers as keys was added in Ruby version 2.0
tadman
@lurker You've been able to use anything as a key for as long as I can remember, it's been a core feature since pretty much forever. This does seem kind of insane if you come from a background like JavaScript where things are coerced to a string.
tadman
@lurker What docs? From the 1.8.7 documentation: "A Hash is a collection of key-value pairs. It is similar to an Array, except that indexing is done via arbitrary keys of any object type, not an integer index. " I'm pretty sure it pre-dates 1.8 significantly as well.
lurker
I was keying (no pun intended) in on the phrase ...not an integer index (following your bolded phrase) which was removed starting in 2.0. I suspect I misinterpreted that phrase. What does it really mean?
tadman
@lurker An Array can only use integer indexes, a Hash can use anything. I think the phrasing here was intended to mean "not necessarily an integer index". If it was removed it's probably because it was causing more confusion than intended.
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