Turn a ruby array into a neat column string?

Question

I'm new to ruby, and I'm trying to make a program that automates formatting for given strings and arrays. One autoformat function I'm trying to figure out is one for arrays. So let's say I have an array like the example below

myArray = ["a", "b", "c"]

and I want to turn it into a columnized string so that puts myString will give

`1) a`
`2) b`
`3) c`

How would I go about doing this? The closest thing I can find is using .each which isn't what I want, I can't have each line a separate entry. It all has to be one string with line breaks.

Any help would be appreciated, thanks in advance

What about this myArray.each_with_index.map {|i, j| "#{i+1}) #{j}"}.join("\n") — Eli Sadoff
– Eli Sadoff, Commented Nov 21, 2016 at 17:15

Anthony · Accepted Answer · 2016-11-21 17:24:00Z

9

You can use .map with .with_index:

myArray = ["a", "b", "c"]

myStr = myArray.map.with_index(1) { |el, i| "#{i}) #{el}" }.join("\n")
puts myStr

Outputs:

1) a
2) b
3) c

edited Nov 21, 2016 at 17:24

answered Nov 21, 2016 at 17:14

Anthony

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4 Comments

Eli Sadoff Over a year ago

For OP's use case you'd want #{i+1}, but this is a great answer.

Eli Sadoff Over a year ago

No worries. Your answer is quite elegant.

Michael Kohl Over a year ago

I think starting the index from 1 by using with_index(1) is better than doing i+1 in every iteration.

Jordan Running Over a year ago

You don't need join here. puts myArray.map.with_index(1) { ... } will have the same result.

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