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Associative array/Creation: Difference between revisions

Associative array/Creation (view source)

Revision as of 16:32, 8 February 2007

530 bytes removed ,  17 years ago
Remove double entry for Ruby
(Added Scala example)
(Remove double entry for Ruby)
Line 232:
==[[Ruby]]==
[[Category:Ruby]]
#aA hash object that returns [[nil]] for unknown keys
hash={}
hash[666]='devil'
Line 238:
hash[666] # => 'devil'
 
#aA hash object that returns 'unknown key' for unknown keys
hash=Hash.new('unknown key')
hash[666]='devil'
Line 244:
hash[666] # => 'devil'
 
#aA hash object that returns "unknown key #{key}" for unknown keys
hash=Hash.new{|h,k|h[k]="unknown key #{k}"}
hash[666]='devil'
hash[777] # => 'unknown key 777'
hash[666] # => 'devil'
 
 
===Iterate over key/value===
Line 355 ⟶ 354:
 
Create a generic mapping function that applys a callback to elements in a list:
 
==[[Ruby]]==
[[Category:Ruby]]
A hash object that returns [[nil]] for unknown keys
hash={}
hash[666]='devil'
hash[777] # => nil
hash[666] # => 'devil'
 
A hash object that returns 'unknown key' for unknown keys
hash=Hash.new('unknown key')
hash[666]='devil'
hash[777] # => 'unknown key'
hash[666] # => 'devil'
 
A hash object that returns "unknown key #{key}" for unknown keys
hash=Hash.new{|h,k|h[k]="unknown key #{k}"}
hash[666]='devil'
hash[777] # => 'unknown key 777'
hash[666] # => 'devil'
 
==[[Smalltalk]]==
Retrieved from "https://rosettacode.org/wiki/Special:MobileDiff/9392"
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