CODEWITHSUNDEEP
ruby
Muhammad Umer
Muhammad Umer

Reputation: 18159

Get first index of any character among array from a string in Ruby?

I have string like this

hi, i am not coming today!

and i have an array of characters like this:

['a','e','i','o','u']

now i want to find the first occurrence of any word from array in string.

If it was only word i'd have been able to do it like this:

'string'.index 'c'

Upvotes: 0

Views: 136

Answers (1)

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121010

s = 'hi, i am not coming today!'
['a','e','i','o','u'].map { |c| [c, s.index(c)] }.to_h

#⇒ {
#  "a" => 6,
#  "e" => nil,
#  "i" => 1,
#  "o" => 10,
#  "u" => nil
# }

To find the first occurence of any character from an array:

['a','e','i','o','u'].map { |c| s.index(c) }.compact.min
#⇒ 1

UPD Something different:

idx = str.split('').each_with_index do |c, i| 
  break i if ['a','e','i','o','u'].include? c
end
idx.is_a?(Numeric) ? idx : nil

str =~ /#{['a','e','i','o','u'].join('|')}/

str.index Regexp.union(['a','e','i','o','u']) # credits @steenslag

Upvotes: 2

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