How to build a Ruby hash out of two equally-sized

问题:

I have two arrays

a = [:foo, :bar, :baz, :bof]

and

b = ["hello", "world", 1, 2]

I want

{:foo => "hello", :bar => "world", :baz => 1, :bof => 2}

Any way to do this?

回答1:

h = Hash[a.zip b] # => {:baz=>1, :bof=>2, :bar=>"world", :foo=>"hello"}

...damn, I love Ruby.

回答2:

Just wanted to point out that there's a slightly cleaner way of doing this:

h = a.zip(b).to_h # => {:foo=>"hello", :bar=>"world", :baz=>1, :bof=>2}

Have to agree on the "I love Ruby" part though!

回答3:

How about this one?

[a, b].transpose.to_h

If you use Ruby 1.9:

Hash[ [a, b].transpose ]

I feel a.zip(b) looks like a is master and b is slave, but in this style they are flat.