1.1 KiB
1.1 KiB
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Ruby Hash |
Ruby Hash
A hash represents a collection of distinct key, value pairs. It is also called associative arrays. To create a hash in Ruby , use curly brackets and separate each key-value pair with comma.
my_hash = {:key1 => "value", :key2 => "value2"}
You can create a hash in the following ways
my_hash = Hash.new # with empty hash
my_hash = {:key1 => "value", :key2 => "value2"} # with key's and value's defined
You can access the value of key in a hash with square brackets and key references
my_hash[:key1] # value
my_hash[:key2] # value2
You can assign a new key and value for an already defined hash
my_hash[:key3] = "value3" # {:key1=>"value", :key2=>"value2", :key3=>"value3"}
You can check how many elements a hash has with the length
method:
my_hash.length # 2
You can also create integers as hash key but the syntax is different from the usual one
my_hash = {1: "value"} # will raise an exception
my_hash = {1 => "value"} # will create hash with corresponding key value pair