I have this map: And I want to add this new key/value: How can I increase the values of all the old map elements in 1? So I get the following map: Answer You can use something like this:
Tag: data-structures
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: this code returns this on the console: These are the coordinates. The question is: How do I store these values in an array as they grow? I tried to do it with the push function
javascript – simple linked list traversal issue
I have implemented a single linked list using javascript. Please find the code below: But the traverse method never prints the last element. What am I missing here? The insertAtTail method looks correct though. Could anyone please let me know. thanks Answer In the traverse, you need to check all nodes not unt…
Search nested array of objects and return whole path of all matching items
I would like to search a deeply nested array of objects and return the path of all matched objects. I have partial solution of the problem but the code returns path of only first matched object. Please have a look at the input, expected output and the code itself. I have commented the desired logic in the exp…
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 : Characteristics of criteria: It could have nested arrays. First item array (or nested array) is always going to be either “and” or “or” Second it…
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…
How are arrays implemented in JavaScript? What happened to the good old lists?
JavaScript provides a variety of data structures to be used ranging from simple objects over arrays, sets, maps, the weak variants as well as ArrayBuffers. Over the half past year I found myself in the spot to recreate some of the more common structures like Dequeues, count maps and mostly different variants …
My check for whether a graph is a Binary Tree always returns false
I have this question that is medium level and couldn’t even think on how to solve this problem, my solution could be overkill as I have no idea on how to traverse a bunch of numbers in an array to check whether it is a binary tree or not. The program always returns false no matter what If you have
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…
How to map key/value pairs of a “map” in JavaScript?
How to map key/value pairs of a “map” in JavaScript: I need to get an mapper containing key/value pair on each iteration: Answer This is not a Map object. It’s just a regular object. So, use Object.entries and then use map on the key value pair: Object.entries returns: Then loop through each…