How to swap two variables in Ruby?

Yeah, It's really simple to do! You must write only one string:
<br />a, b = b, a<br />
Ruby provides parallel assignment - they can be preformed in parallel. So it's normal code for Ruby:
<br />step = 10<br />a, b, c = 0, (step += 10), (step += 10) #-> [0,10,20]<br /><br />ar = [0,10,20]<br />a, b = ar #-> a=0, b=10<br />a, *b = ar #-> a=0, b=[10,20]<br />
Moreover, Ruby provides nested assignment:
<br />b, (c, d), e = 1,2,3,4 #-> b=1, c=2, d=nil, e=3<br />