I am trying to improve in my Problem Solving Skills and would love to get some explanation on what it is that I am doing wrong or if I can get a hand in the right direction. My code below is what I am stuck on. My problem, I am trying to check within the array if it contains any
Tag: arrays
Reduce throws “NaN” in JavaScript?
I am trying to sum items in array. While searching Google and Stack Overflow I found that reduce is a good way of summing an array items. But, when there isn’t any key value pair reduce throws error as “Nah”, so how to deal with it? My array exam: So from above, I need to calculate all the k…
Angular: render section list data using *ngFor
Is there any way to display section list in Angular using *ngFor? All examples I found are using separate loops for separate sections. Thank you! Expected UI: Answer You may use the following code on the template: Tweak the styles accordingly.
How to get a property value from an array of objects in JavaScript
I want to make an array with country names from a JSON file which contains an array of objects. These objects have a property name with the name of the country, which is what I need. This is my JavaScript code which returns a list of undefined instead of country names: In the other hand, if I use forEach, I
Fill array with prompt in JavaScript and use push method
I am learning arrays in JavaScript and I am using the foreach with the push method. The following code is working as its supposed to: But I want to replicate this with a prompt, instead of hard coding the values in the array. And end the prompt with a 0. The code I attempted is the following, but the variable…
Recursively Search in Array with a For Loop
I know there are better ways to search an array, but I really want to understand how to return when the value is found in a recursive call. Logging when found isn’t a problem, but I can’t seem to make this return true when found. The problem is basic. Fully search multi-dimensional array for a val…
Array manipulation with multiple conditions – Vue.js / JavaScript
In my Vue.js application I use a navigation drawer to display the different pages a user has access to. Pages are also only visible if the administrator has activated the related module. Therefore the unique moduleID is set for each page and children. The list is populated by filteredPages[]. This array is th…
Compare arrays of Errors in Chai
I have a validator method that returns an array with Errors. I want to create a unit test that compares this errors, but I can’t use expect(fn).to.throw since I don’t throw the errors, just return them. This is my approach but I get AssertionError: expected [ Array(2) ] to have the same members as…
Break array of objects into 2dimensional array
I need to break an array of objects into a 2-dimensional array where 1-dimensional arrays would consist of objects which have their attributes ‘for’ and ‘to’ being not overlapping intervals. Example: Given array arr1 I wish to receive arr2 How it should work: We loop through the arr1. …
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 awa…