I want to push only unique objects into an array with $addToSet. My userSchema has a field bankDetails which should take an array of objects: I am updating the schema using the following controller function: The data is saving correctly but Mongo auto generates an _id field every time so technically none of the objects are unique and the objects
Tag: set
Pushing array into an array of array in TS
I am coming from Python, and am not entirely familiar with the ‘proper’ JS/TS way of doing things. I am looping through the elements of a set, and I am pushing lists of some of the elements onto a 2D array. I am getting the following error TypeError: Cannot read properties of undefined (reading ‘push’). What am I doing wrong,
How to get new Set from array of arrays by using Array.map function?
Exploring Sets now and could not get a new Set from an array of x arrays in it. I what to use Array.map method inside new Set(). Here is what I’m trying to do, and it seems logical, but in the end having values only from the 1st array: Will be awesome to understand what I am doing wrong and
JavaScript – Any subtle differences with Array.from(set) vs Array.from(set.values())
I know both methods result in the same exact thing and are valid ways to create an Array from a Set. But I’m curious if there’s any difference between and/or reason to use one method over the other when specifically utilizing the following methods: I’m guessing in this context, other than one method being slightly more verbose, there’s no difference.
Sorted (ordered) collection for JavaScript
I’m looking for sorted container for JavaScript. I’m using C++ std::set, https://en.cppreference.com/w/cpp/container/set and try porting my code to JavaScript. JavaScript Map is not ordered container. I need some ordered container. I don’t need completely compatible container of std::set on C++. My requirements are Custom comparator support Automatically sorted Find the specific value. If value is not found, get the next
How to build a Set of unique Arrays?
I want to add many arrays to a Javascript set, and ensure that only unique arrays are added to the set. However, when I try adding the same array multiple times, it is always added instead of rejected. The .has() method always returns false as well. How do I fix this? Answer I’d use a Map instead, indexed by the
Output Array of Simultaneously Possible Unique Element Combinations
My application references a database object that acts as a catalog. It’s a catalog of items that can be crafted if the user has the necessary components. Here is a small sample of the catalog: When the user has the necessary components for any given item, the user can assemble that item. The user is awarded components arbitrarily and randomly,
Array item gets the value “undefined”
I am trying to create an array of unique numbers from 0 to 10: But the output of the array will always have an undefined item at a random index which I don’t know why. Can somebody help me out? Answer If the new Set removes a duplicate, then i will be larger than the length of numbers, due to
Set of objects in javascript
I’d like to have a set of objects in Javascript. That is, a data structure that contains only unique objects. Normally using properties is recommended, e.g. myset[“key”] = true. However, I need the keys to be objects. I’ve read that Javascript casts property names to strings, so I guess I can’t use myset[myobject] = true. I could use an array,