How to see if a string ends with one of multiple characters

Question

I have this statement:

string_tokens[-1].ends_with?(",") || string_tokens[-1].ends_with?("-") || string_tokens[-1].ends_with?("&")

I would like to put all the tokens (",", "-", "&") into a constant and simplify the above to ask, "does the string end with any of these characters", but I'm not sure how to do that.

What is `string_tokens`? We can assume a string, but for clarity it needs to be defined. When asking for help, we need to see working code showing what you tried. That helps us see any errors you're making and lets us fix/respond with answers that directly apply to your use. Please see "[ask]" and the linked pages and "[mcve](https://stackoverflow.com/help/minimal-reproducible-example)" — the Tin Man, Oct 17 '19 at 20:08

score 4 · Accepted Answer · edited Mar 01 '17 at 18:01

4

Yes.

CONST = %w(, - &).freeze
string_tokens[-1].end_with?(*CONST)

Usage:

'test,'.end_with?(*CONST)
#=> true
'test&'.end_with?(*CONST)
#=> true
'test-'.end_with?(*CONST)
#=> true

You use * (splat operator) to pass multiple args to the String#end_with?, because it accepts multiple.

edited Mar 01 '17 at 18:01

the Tin Man

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answered Mar 01 '17 at 16:41

Andrey Deineko

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`CONST = %w|, - &|.freeze`? – Aleksei Matiushkin Mar 01 '17 at 16:45
very nice, real, +1 – Oleksandr Holubenko Mar 01 '17 at 21:20

score 0 · Answer 2 · answered Mar 01 '17 at 18:11

0

You could also use a regex :

chars = %w(, - &)
ENDS_WITH_CHAR = Regexp.new("["+chars.map{|s| Regexp.escape(s)}.join+']\z')
"abc-" =~ ENDS_WITH_CHAR
# or with Ruby 2.4
"abc-".match? ENDS_WITH_CHAR

answered Mar 01 '17 at 18:11

Eric Duminil

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Cary Swoveland · Answer 3 · 2017-03-02T07:19:35.890

0

str = 'hello-'

',-&'.include? str[-1]
  #=> true

',$&'.include? str[-1]
  #=> false

edited Mar 02 '17 at 07:19

answered Mar 02 '17 at 07:13

Cary Swoveland

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How to see if a string ends with one of multiple characters

3 Answers3

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