How to match and iterate on a string after another string in Ruby

Question

I have a string like:

"abc-12\nxyz-17\nabc-18\npqr-13\n"

I want to match the number after each string and sum them all up. For example, I want to sum 12 and 18 for abc. How do I go about this?

Casper · Accepted Answer · 2012-08-07 00:41:46Z

2

s = "abc-12\nxyz-17\nabc-18\npqr-13\n"

s.split.inject(Hash.new(0)) { |h,e| id, n = e.split('-'); h[id] += n.to_i; h }
=> {"abc"=>30, "xyz"=>17, "pqr"=>13}

answered Aug 7, 2012 at 0:41

Casper

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2 Comments

navgeet Over a year ago

Is there a Ruby Idiom to convert the generated hash to two arrays. I want to get ["abc", "xyz", "pqr"] and [30, 17, 13]. I ended up writing a method for this.

Casper Over a year ago

@navgeet - Hash has methods named keys and values. Those give you the arrays you need respectively.

jnevelson · Accepted Answer · 2012-08-07 00:36:49Z

2

"abc-12\nxyz-17\nabc-18\npqr-13\n".split("\n").inject(0) do |sum, line|
  sum += line[/[\w]+(\d)+/].to_i
end

answered Aug 7, 2012 at 0:36

jnevelson

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