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I've currently got this hash:
{:residential=>"false"}
But I need to make it an item of an array:
[{:residential=>"false"}]
How do I do that?
576
While an array can be used to construct hash tables, array indexes its elements using integers. However, if we want to store data and use keys other than integer, such as 'string', we may want to use dictionary. Dictionaries in Python are implemented using hash tables.
To append a new value to the array of values associated with a particular key, use push : push @{ $hash{"a key"} }, $value; The classic application of these data structures is inverting a hash that has many keys with the same associated value. When inverted, you end up with a hash that has many values for the same key.
In Ruby, a hash is a collection of key-value pairs. A hash is denoted by a set of curly braces ( {} ) which contains key-value pairs separated by commas. Each value is assigned to a key using a hash rocket ( => ). Calling the hash followed by a key name within brackets grabs the value associated with that key.
To assign that array to a hash element, you'd use either $b{"x"} = [@a] or $b{"x"} = \@a , depending on what you're trying to do. [@a] makes a new arrayref containing a copy of the current contents of @a . If the contents of @a change after that, it has no effect on $b{x} .
my_array = []
my_array << {:residential => "false"}
=> [{:residential=>"false"}]
The code you've already written should be just fine.
>> x = [{:residental=>"false"}, {:residental=>"true"}]
=> [{:residental=>"false"}, {:residental=>"true"}]
>> x[0][:residental]
=> "false"
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