Create a Hash: Difference between revisions
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#REDIRECT [[Associative array/Creation]] |
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{{task}} |
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Create a Hash object that links keys to values and returns a pre-specified element when a key is unknown. |
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==[[Ruby]]== |
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#a hash object that returns nil for unknown keys |
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hash={} |
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hash[666]='devil' |
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hash[777] # => nil |
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hash[666] # => 'devil' |
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#a hash object that returns 'unknown key' for unknown keys |
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hash=Hash.new('unknown key') |
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hash[666]='devil' |
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hash[777] # => 'unknown key' |
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hash[666] # => 'devil' |
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#a hash object that returns "unknown key #{key}" for unknown keys |
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hash=Hash.new{|h,k|h[k]="unknown key #{k}"} |
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hash[666]='devil' |
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hash[777] # => 'unknown key 777' |
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hash[666] # => 'devil' |
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Latest revision as of 19:09, 9 March 2013
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