NoMethodError: Intersection function method not found for arrays

user_936269 0
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I am writing a script where I would like to use the .intersection method on Array. But when I call the method on an array I get NoMethodError. See full IRB output:

larsnielsen@darkstar ruby % irb
irb(main):001:0> x = ["a", "b"]
=> ["a", "b"]
irb(main):002:0> y = ["a", "c"]
=> ["a", "c"]
irb(main):003:0> x.intersection y
Traceback (most recent call last):
        4: from /Users/larsnielsen/.rbenv/versions/2.6.5/bin/irb:23:in `<main>'
        3: from /Users/larsnielsen/.rbenv/versions/2.6.5/bin/irb:23:in `load'
        2: from /Users/larsnielsen/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
        1: from (irb):3
NoMethodError (undefined method `intersection' for ["a", "b"]:Array)

I am running Ruby 2.6.5p114 and from what I can tell the function should exist in this version.

Minimal working example:

x = ["a", "b"]
y = ["a", "c"]
x.intersection y
ruby arrays
2 Answers
x = ["a", "b"]
y = ["a", "c"]
x & y #["a"]

You can follow above code to accomplish your Array intersection.

user_127021370

Firstly, you should check version Ruby in your computer intersection method only support for Ruby 2.6

If you using ruby 2.5, you could &

user_61240320
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