AlgoDaily - Single Lonely Number

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var assert = require('assert');
​
function lonelyNumber(numbers) {
  // Fill in this method
  return numbers;
}
​
try {
  assert.equal(lonelyNumber([4, 4, 6, 1, 3, 1, 3]), 6);
​
  console.log(
    'PASSED: ' + '`lonelyNumber([4, 4, 6, 1, 3, 1, 3])` should return `6`'
  );
} catch (err) {
  console.log(err);
}
​
try {
  assert.equal(lonelyNumber([3, 3, 9]), 9);
​
  console.log('PASSED: ' + '`lonelyNumber([3, 3, 9])` should return `9`');
} catch (err) {
  console.log(err);
}
​
try {
  assertIsFunction(lonelyNumber, '`lonelyNumber` is a function');

OUTPUT

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