how to filter an nested objects inside an array in javascript

I have the following nested objects in an array and i want to filter the result to return the id of a specific item. const data = [ {0: {id: 1, country: “SA”, address: “IOXX”}}, …

How to increase all values of a map in javascript

I have this map: var map = new Map(); map.set(“10/10”, 0); map.set(“10/11”, 1); map.set(“10/12”, 2); { “10/10”: 0, “10/11”: 1, “…

How to push new elements in an array as they increase in number?

I have a gird with a few nodes. As I move my mouse on the gird, the values of row and col change. For example: const handleMouseEnter = (row, col) => { console.log(row, col); }; this code …

javascript – simple linked list traversal issue

I have implemented a single linked list using javascript. Please find the code below: class Node { constructor(data) { this.data = data; this.nextElement = null; } } class LinkedList { …

Traversing recursively through an array and modifying values of object properties in JavaScript

The post may seem lengthy but it’s quite easy to follow, if not, I will add more details I have criteria array which that looks like : let criteria = [ “and”, { &…

Array of products arrange by category

I’m trying to arrange this array of products by categories. For now, I get the count of each category but I can’t figure out how to make this two dimension array output. This is my code for now: Answer You can group elements by reducing over the array using an object to store elements belonging to each category. To get the grouped categories, we can use Object.values.

NodeJs heap-js module: Heap is not a constructor

I am trying to initialize a minimum heap/priority queue in my server.js using the head-js module (https://github.com/ignlg/heap-js). When I run my code, I receive the following error: TypeError: Heap is not a constructor However, according to the documentation, I am initializing the heap correctly, putting in a custom constructor as the parameter. Below is my code: Answer There’s a difference between using heap-js library in CommonJS and ES6 modules. When requireing (i.e. CommonJS) you need to destruct out the Heap class from the object returned, like so: Whereas, you have to do the opposite in ES6, as shown below:

How to keep an Javascript object/array ordered while also maintaining key lookups?

I have some data which I originally stored in a generic Javascript object, with the ID as a key: { “7”: {“id”:”7″,”name”:”Hello”}, “3”: {“id”:”3″,”name”:”World”}, … } However, I discovered …

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 …