Completed "should use 'map' to transform each element" - map is pure, returns a shallow copy that has been modified per the operation    of the callback function fed to it   - in this case, returning x+1 for each element in the array being mapped
Completed "should use 'map' to transform each element"
- map is pure, returns a shallow copy that has been modified per the operation
   of the callback function fed to it
  - in this case, returning x+1 for each element in the array being mapped

ning-github/javascript-koans,ning-github/javascript-koans,ning-github/javascript-koans