Convert an Array of Strings into an Array of Hashes with same key

Question

I have an array of strings:

names = ['Caitlyn', 'Jayce', 'Jinx', 'Vi']

and my goal is to create several instances and once from this array:

Champion.create!([{ name: 'Caitlyn'}, { name: 'Jayce'}, { name: 'Jinx'}, { name: 'Vi']})

What would be the best way for getting from the array of strings to the array of hashes? My current approach is as follows, but knowing Ruby, there must be something better:

names.map { |name| { name: name } }

Your code is great, it is short, easy to read and to understand. What would you consider "better"? Shorter? Faster? — spickermann
– spickermann, Commented Nov 2, 2022 at 8:48
wondering if there is a more concise way of writing what I did - maybe a hidden Ruby method that I'm not aware of :) — Naoki Mi
– Naoki Mi, Commented Nov 2, 2022 at 9:10

spickermann · Accepted Answer · 2022-11-02 09:26:33Z

3

The only way I can think of to make this even shorter would be using numbered block parameters which were introduced int Ruby 2.7.

names = ['Caitlyn', 'Jayce', 'Jinx', 'Vi']
names.map { { name: _1 } }
#=> [{:name=>"Caitlyn"}, {:name=>"Jayce"}, {:name=>"Jinx"}, {:name=>"Vi"}]

But I am not sure if this improves readability.

answered Nov 2, 2022 at 9:26

spickermann

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1 Comment

Konstantin Strukov Over a year ago

Or hash shorthand introduced in Ruby 3.1: names.map { |name| { name: } }

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