CODEWITHSUNDEEP
rubyregex
Daniel Viglione
Daniel Viglione

Reputation: 9457

Replacing hyphens in words with the next letter capitalized

I have a symbol like the following. Whenever the symbol contains the "-" hyphen mark, I want to remove it and upcase the subsequent letter. I am able to do it like so:

sym = :'new-york'
str = sym.to_s.capitalize
/-(.)/.match(str)     
str = str.gsub(/-(.)/,$1.capitalize)     
=> "NewYork"

This required four lines. Is there a more elegant way to create CamelCase (upper CamelCase e.g. NewYork, NewJersey, BucksCounty) from hyphened words in Ruby?

Upvotes: 0

Views: 129

Answers (3)

Cary Swoveland
Cary Swoveland

Reputation: 110725

r = /
    ([[:alpha:]]+) # match 1 or more letters in capture group 1
    -              # match a hyphen
    ([[:alpha:]]+) # match 1 or more letters in capture group 2
    /x             # free-spacing regex definition mode

sym = :'new-york'
sym.to_s.sub(r) { $1.capitalize + $2.capitalize }
  #=> "NewYork"

Upvotes: 0

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121010

sym.to_s.gsub(/(-|\A)./) { $&[-1].upcase }

or

sym.to_s.gsub(/(-|\A)./) { |m| m[-1].upcase }

Upvotes: 0

Sagar Pandya
Sagar Pandya

Reputation: 9498

Here's one way:

sym.to_s.split('-').map(&:capitalize).join #=> "NewYork"

Upvotes: 4

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