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Strict inequality

With !== two values are compared for strict inequality.
var c1 = 'rose' !== 'Rose';
var 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.

Exercise

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. The call unequal(1, 2, 3) should return true and unequal(1, 1, 2) should return false.