Ruby check if nil before calling method

Question

I have a string in Ruby on which I\'m calling the strip method to remove the leading and trailing whitespace. e.g.

s = \"12345 \"
s.strip

H

Answer 1

Ruby 2.3.0 added a safe navigation operator (&.) that checks for nil before calling a method.

s&.strip

If s is nil, this expressions returns nil instead of raising NoMethodError.