Starting simply, name a value that is not === to itself:
a !== a
And its dual - name two values that are different but do === each other. The second part of this puzzle is to provide a statement that can distinguish b and c. (clue - don’t look unless you’re stuck
b === c
What’s a value that seems to be the same as its complement (there are quite a few possibilities):
!d == d
How about something that seems to give 42 more than you might expect (Can you find a second way of doing the same thing)?
(e + 4 === 42) && ("4" + e.toString() === "42")
How did you do?