How do I count substrings within array of strings?

Question

I have an array:

["Passive: 8", "Passive: 9", "Neutral: 3"]

Now I need to count the number of times Passive is seen. How can I count the number of occurrences a substring is seen within strings inside of an array?

sawa · Accepted Answer · 2013-10-11 20:57:01Z

4

["Passive: 8", "Passive: 9", "Neutral: 3"].grep(/Passive/).count
# => 2

answered Oct 11, 2013 at 20:57

sawa

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1 Comment

Luigi Over a year ago

Ah, beat me to it. This is also cleaner as it's one line of code. Thanks.

Luigi · Accepted Answer · 2013-10-11 20:59:32Z

0

I found an answer within grep.

arr.grep(/^Passive/).each do |element|
  ...
end

This will suffice for my purpose.

answered Oct 11, 2013 at 20:59

Luigi

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3 Comments

the Tin Man Over a year ago

This doesn't answer the question you asked, it only finds the ones matching, and doesn't count them.

Luigi Over a year ago

Agreed - This isn't complete, but I could iterate over each element and add one each time. However, sawa's answer is much more efficient.

the Tin Man Over a year ago

@sawa's answer is also idiomatic Ruby. That it's a single line of code isn't important.

hirolau · Accepted Answer · 2013-10-12 15:48:08Z

0

Another way to do it:

array.count{|x|x['Passive']}

answered Oct 12, 2013 at 15:48

hirolau

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