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Write a function called fizzBuzz that takes in one integer as an argument.
The function should return the integer that it was given, except when it is a multiple of 3 or 5.

If the number is a multiple of 3, return 'Fizz' instead of the number. 
Similarly, if the number is a multiple of 5, return 'Buzz'.
Lastly, if the number is a multiple of both 3 and 5, return 'FizzBuzz'. 
JavaScript Syntax

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Displaying Output
alert('Hello there!');
assert(1 == 2, 'Assertion failed!');
if (num >= 100) {  doStuff(); } else {  doOtherStuff(); }
for (var i = 0; i < n; i++) {  alert(i); } while (n >= 0) {  alert(n);  n--; }
function multiply(x, y) {   return x * y; } alert(multiply(2, 5));
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