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Strict inequality

With !== two values are compared for strict inequality.
let c1 = 'rose' !== 'Rose';
let c2 = 10 !== '10';
Both comparisons result in true. The first one, because the two strings differ in upper and lower case. The second, because the two values differ in type.


Write a function unequal that checks 3 values for strict inequality. The function should return true if all three parameters are strict unequal. Otherwise false.

Example: unequal(1, 2, 3) should return true and unequal(1, 1, 2) should return false.
function unequal(a, b, c) {
  return a !== b && ...
function unequal(a, b, c) {
  return a !== b && a !== c && b !== c;