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Mask all but last 4 digits

If you need to mask all but the last 4 digits of a nubmer - like a credit card number - this helper works nicely.

Just pass it a number or string.

def mask_number(number)
  number.to_s.size < 5 ? number.to_s : (('*' * number.to_s[0..-5].length) + number.to_s[-4..-1])
end

to ruby rails actionview helpers by jrm02t on Nov 28, 2006

Check for under age

This function can be used to check if a user is underage.

Note: This is using rails core extensions. It'd need to be modified a bit for a pure ruby implementation.

def underage?(birthday)
  18.years.ago < birthday
end

to ruby rails age by jrm02t on Nov 28, 2006 4 Comments