/ Ruby
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method

[]

ruby latest stable - Class: Hash
[](*args)
public

Creates a new hash populated with the given objects.

Similar to the literal { key => value, … }. In the first form, keys and values occur in pairs, so there must be an even number of arguments.

The second and third form take a single argument which is either an array of key-value pairs or an object convertible to a hash.

Hash["a", 100, "b", 200]             #=> {"a"=>100, "b"=>200}
Hash[ [ ["a", 100], ["b", 200] ] ]   #=> {"a"=>100, "b"=>200}
Hash["a" => 100, "b" => 200]         #=> {"a"=>100, "b"=>200}

2Notes

Assignment using 'key: value'

UnfalseIdeas · Jul 19, 2012

Another shorthand way of assigning key, value pairs:

Hash[one: 1, two: 2] #=> {:one=>1, :two=>2}

@UnfalseIdeas

pascal · Apr 17, 2013

What is the purpose of 

Hash[one: 1, two: 1]

When you can write

{one: 1, two: 2}

Aren't you just passing a hash into the [] method?