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May 24th, 2018
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  1. function smile(isHappy) {
  2. if (isHappy) {
  3. const smiling = 'I am happy!';
  4. } else {
  5. const sad = 'I am sad!';
  6. console.log(smiling);
  7. }
  8. }
  9.  
  10. smile(false); // ReferenceError: smiling is not defined
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