syntax - Simple way to test if multiple variables have same value, ruby -

is there simple way of testing several variables have same value in ruby?

something linke this:

if == b == c == d #does not work    #do because a, b, c , d have same value end 

of course possible check each variable against master see if true, bit more syntax , not clear.

if == b && == c && == d #does work     #we have tested same thing, more syntax. end 

another reason why need if work on each variable before test.

if array1.sort == array2.sort == array3.sort == array4.sort #does not work     #this clear , not introduce unnecessary variables end #vs tempclutter = array1.sort if tempclutter == array2.sort && tempclutter == array3.sort && tempclutter == array4.sort #works    #this works, introduces temporary variables makes code more unclear end 

throw them array , see if there 1 unique item.

if [a,b,c,d].uniq.length == 1   #i solve every problem putting things arrays end 

as sawa points out in comments .one? fails if false or nil.