Accessing Hashes : has_key « Hash « Ruby

1. Ruby
2. Hash
3. has_key

Accessing Hashes

Here's a hash that associates zip codes with the names of towns

zip = { 1 => "One", 2 => "Two", 3 => "Three",
4 => "Four", 5 => "Five", 6 => "Six", 7 =>
"Seven", 8 => "Eight", 9 => "Eight" }

# test to see if the hash zip has a given key with any of the following methods, 
# which are all synonyms of each other: key?, has_key?, member?, or include?:

zip.has_key? 1 # => true

 

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