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Home/ Questions/Q 6801849
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T19:09:03+00:00 2026-05-26T19:09:03+00:00

foo = foos.select{|x|x.name == xval}.first.value If there is no match for xval then it

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foo = foos.select{|x|x.name == xval}.first.value

If there is no match for xval then it evaluates to a undefined method on nil:NilClass. How should I avoid this and return a nil object instead?

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  1. Editorial Team
    Editorial Team
    2026-05-26T19:09:04+00:00Added an answer on May 26, 2026 at 7:09 pm

    Check return result of first method:

    foo = foos.select {|x| x.name == xval }.first
    foo.nil? ? nil : foo.value
    

    ADDED: Or use Enumerable#find:

    foo = foos.find {|x| x.name == xval }
    
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