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I'm new to javascript, and I'm trying to learn more about working with array's so I built a grocery list builder, and I'm getting stuck on reducing the list if the user accidentally inserts an item twice.

I think the problem is that my reducing function isn't hitting the item selector, but I haven't been able to find any examples showing this kind of problem.

This is what I have for a reducing function:

function reducingFood() {
   var reducedFood = myGroceries.reduce(function(obj, item) {
   var itemName = item['item'];
       if(!obj[itemName]) {
           obj[itemName] = 0;
       }
       obj[itemName]++;
       return obj;

   }, {}) 

    addStructure();
}

I setup a JSFiddle showing the full code: https://jsfiddle.net/Jon43/frvLc7Le/8/

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  • I'm not understanding your question, I might be reading it wrong but in short terms are you asking how to check for duplicates? Commented Nov 17, 2017 at 3:37
  • If you are looking to remove duplicates then maybe this JsFiddle Demo will be of some help. All credit to this answer- "Remove duplicates in an object array Javascript" Commented Nov 17, 2017 at 4:03
  • Reduce is not the correct method. Read up on it on MDN Commented Nov 17, 2017 at 4:06
  • @Andrew Well it seems to work just fine in the example I have provided from an existing answer. I thought I would see if this has been answered before rather than answering and possibly creating a duplicate answer. What is the correct method Andrew, could you give an example please. I can no doubt take note from it for future. Thank you. Commented Nov 17, 2017 at 4:09
  • @NewToJS You're right. I misread part of the code. IMO, this type of question is most straightforward with a full algorithm, but this works too. My bad. Commented Nov 17, 2017 at 4:20
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