Convert array to hash and initialize value

Question

What is the best way to convert an array

arr = ["one", "two", "three", "four", "five"]

to the hash

{"one"=>0, "two"=>0, "three"=>0, "four"=>0, "five"=>0}

I plan to fill in the "0" with my values later, I just need the technique now.

Thank.

+3

resultsway May 28 '15 at 4:55 am

5 answers

I don't know if this is the best way:

Hash[arr.map{ |el| [el, 0] }]

+5

Kimball May 28 '15 at 5:01

I would do this:

arr.inject({}) { |hash, key| hash.update(key => 0) }

+3

spickermann May 28 '15 at 5:01

Hash[ *arr.collect { |v| [ v, 0 ] }.flatten ]

+2

errata May 28 '15 @ 5:21 am

You can also do

arr.each_with_object({}) {|v, h| h[v] = 1}

Where:

0

FloatingRock 29 Mar 17 at 10:59

Cary swoveland · Accepted Answer · 2015-05-28T05:31:02+0000

arr.product([0]).to_h

or for versions <2.0

Hash[arr.product([0])]