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to_h 

        # Array.to_h

(from ruby core)
---
    array.to_h -> new_hash
    array.to_h {|item| ... } -> new_hash

---

Returns a new Hash formed from `self`.

When a block is given, calls the block with each array element; the
block must return a 2-element Array whose two elements form a key-value
pair in the returned Hash:
    a = ['foo', :bar, 1, [2, 3], {baz: 4}]
    h = a.to_h {|item| [item, item] }
    h # => {"foo"=>"foo", :bar=>:bar, 1=>1, [2, 3]=>[2, 3], {:baz=>4}=>{:baz=>4}}

When no block is given, `self` must be an Array of 2-element sub-arrays,
each sub-array is formed into a key-value pair in the new Hash:
    [].to_h # => {}
    a = [['foo', 'zero'], ['bar', 'one'], ['baz', 'two']]
    h = a.to_h
    h # => {"foo"=>"zero", "bar"=>"one", "baz"=>"two"}

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