flatten not working for products array in AboutApplyingWhatWeHaveLearnt.js

[c4p3n]

In the very last challenge in AboutApplyingWhatWeHaveLearnt.js, it("should count the ingredient occurrence (imperative)", I tried replacing the FILL_ME_IN placeholder with _(products).flatten() to see what the effect would be. The output to the browser in KoansRunner.html is as follows:

[ { name : 'Sonoma', ingredients : [ 'artichoke', 'sundried tomatoes', 'mushrooms' ], containsNuts : false, beget : Function }, { name : 'Pizza Primavera', ingredients : [ 'roma', 'sundried tomatoes', 'goats cheese', 'rosemary' ], containsNuts : false, beget : Function }, { name : 'South Of The Border', ingredients : [ 'black beans', 'jalapenos', 'mushrooms' ], containsNuts : false, beget : Function }, { name : 'Blue Moon', ingredients : [ 'blue cheese', 'garlic', 'walnuts' ], containsNuts : true, beget : Function }, { name : 'Taste Of Athens', ingredients : [ 'spinach', 'kalamata olives', 'sesame seeds' ], containsNuts : true, beget : Function } ]

It appears to me that the flatten function isn't actually doing anything to the products array. Am I misusing the function or is there a problem?

[meaton-potatoes]

I had that issue, as well, with both flatten() and chain()

[SherylHohman]

See

• issue requires original syntax of chain for koan 53 #64
• pull request Add note: koan 53 requires older chain() syntax for underscore 1.1.6 #65
  for an explanation and solution for .chain issues:
  requires original syntax of chain for koan 53 #64