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Compare numbers

Numbers can be compared with the well-known mathematical symbols. In the following examples, all expressions return the value true. 
let v1 = 5 > 4;
let v2 = 5 >= 5;
let v3 = 5 < 6;
let v4 = 5 <= 5;

Exercise

Write a function isThreeDigit that checks if a number is greater than or equal to 100 and less than 1000.

Example: isThreeDigit(500) should return true and isThreeDigit(50) should return false.
function isThreeDigit(x) {
  return x >= 100 && ...
}
function isThreeDigit(x) {
  return x >= 100 && x < 1000;
}

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