[Vuejs]-Cannot read property 'find' of undefined vue.js

Your loop variable name ‘comments’ is the same as the array variable name ‘comments’, also you don’t need to await before find.

 **comments**.find((**comments**) => **comments**.postID === doc._id);

should be:

comments.find((comment) => comment.postID === doc._id);

here: comments = [comment, comment, comment, comment];