String concatenation

One of common thing that any programs do is concatenate two or more String value, e.g.

first_name = 'huy'
sir_name = 'le'
name = first_name + ' ' + sir_name # huy le

But the above code suffers a problem, if one of concatenated variables is nil, then it will not work. Checking nil is tedious and error prone, a simple solution of this problem is putting concatenated variables into an array, removing nil using compact and using join method to perform concatenation.

first_name= 'huy'
middle_name=nil
sir_name = 'le'
name = [first_name, middle_name, sir_name].compact.join(' ') # huy le