CODEWITHSUNDEEP
rubyregex
Snowcrash
Snowcrash

Reputation: 86097

Ruby - at least one item in array ALSO in line

Given this array:

["/Item A/", "/Item B/"]

and a line:

Here's a line of text that includes /Item B/

what's a good, idiomatic, Ruby way of checking if the line includes at least one phrase from the array?

Upvotes: 1

Views: 61

Answers (3)

Cary Swoveland
Cary Swoveland

Reputation: 110675

If elements of the array follow a pattern, as in your example, you may wish to use a regex to improve efficiency. For example:

a = ("A".."X").map { |c| "/Item #{c}/" }
  #=> ["/Item A/", "/Item B/", "/Item C/",..., "/Item X/"] 

"I considered /Item Y/ and /Item R/. I want the R!" =~ /\/Item [A-X]\// #=> 26 
"I considered /Item Y/ and /Item Z/. I want the Z!" =~ /\/Item [A-X]\// #=> nil

Upvotes: 0

Rokibul Hasan
Rokibul Hasan

Reputation: 4156

Above answer is very nice, You can also try the following code snippet using any? and include?

a = ["/Item A/", "/Item B/"]
l = "Here's a line of text that includes /Item B/"

a.any? { |e| l.include?(e) }
=> true

Upvotes: 2

Philip Hallstrom
Philip Hallstrom

Reputation: 19879

Couple of ways. Speed may depend on the size of your array and line. Might want to run some benchmarks to see:

> a = ["/Item A/", "/Item B/"]
> l = "Here's a line of text that includes /Item B/"

Then using any?:

> a.any?{|e| l.index(e)}
=> true

Or using a Regexp:

> l =~ Regexp.union(a)
=> 36

Upvotes: 4

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