Comparison of programming languages (associative array): Difference between revisions

Revision as of 05:39, 22 January 2016

Revision as of 05:42, 22 January 2016

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In Ruby a [[hash table|hash]] is used as follows:

<source lang=Rubyirb>

irb(main):001:0> phonebook = {

irb(main):002:1* 'Sally Smart' => '555-9999',

irb(main):003:1* 'John Doe' => '555-1212',

irb(main):004:1* 'J. Random Hacker' => '553-1337'

irb(main):005:1> }

}

=> {"Sally Smart"=>"555-9999", "John Doe"=>"555-1212", "J. Random Hacker"=>"553-1337"}

irb(main):006:0> phonebook['John Doe']; #produces this -> '555-1212'

=> "555-1212"

</source>

Ruby supports hash looping and iteration with the following syntax:

<source lang=Rubyirb>

irb(main):007:0> ### iterate over keys and values

irb(main):008:0* phonebook.each {|key, value| puts key + " => " + value}

Sally Smart => 555-9999

John Doe => 555-1212

### iterate keys only

J. Random Hacker => 553-1337

phonebook.each_key {|key| puts key}

=> {"Sally Smart"=>"555-9999", "John Doe"=>"555-1212", "J. Random Hacker"=>"553-1337"}

irb(main):009:0> ### iterate valueskeys only

irb(main):010:0* phonebook.each_valueeach_key {|valuekey| puts valuekey}

Sally Smart

John Doe

J. Random Hacker

=> {"Sally Smart"=>"555-9999", "John Doe"=>"555-1212", "J. Random Hacker"=>"553-1337"}

irb(main):011:0> ### iterate keysvalues only

irb(main):012:0* phonebook.each_value {|value| puts value}

555-9999

555-1212

553-1337

=> {"Sally Smart"=>"555-9999", "John Doe"=>"555-1212", "J. Random Hacker"=>"553-1337"}

</source>