AlgoDaily - Missing Number In Unsorted

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var assert = require('assert');
​
function missingInUnsorted(arr, lowerBound, upperBound) {
  // fill in this method
  return arr;
}
​
try {
  assert.equal(missingInUnsorted([2, 5, 1, 4, 9, 6, 3, 7], 1, 9), 8);
​
  console.log(
    'PASSED: missingInUnsorted([ 2, 5, 1, 4, 9, 6, 3, 7 ], 1, 9) should return 8'
  );
} catch (err) {
  console.log(err);
}
​

OUTPUT

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