I have an array of users and each user has a array of tags and I have an array of selected Tags What is the best way in ES6 to filter the users by selected tags and my selected tags are and I expect to receive a result as Answer Filter the users, and then check that every id is
Tag: arrays
How to get index of an empty element of an array?
I have a JavaScript array with some empty (maybe null or undefined) elements. I need to find those empty indexes (1 and 3). But my solution is not working: Snippet: Answer Use a blank string to compare to get the answer you desire. If you also want to check for undefined you can use logical or to check both o…
How to sort an array of object depending on value of a subfield?
I have an array of objects called posts with a nested field answer. I have different conditions depending on which I need to sort my array. Example array What I need to do is…I want to sort all the answers with type “video” to start and after that type “audio” and then type ̶…
Can data structure be structured by another data structure?
I’m a little bit confused. Wikipedia says that Array is a data structure: In computer science, an array data structure, or simply an array, is a data structure consisting of a collection of elements (values or variables), each identified by at least one array index or key. Stack and queue are also data …
Higher-order function with recursion in Javascript
newbie here… I’m trying to grasp the concept of functional programming in Javascript, but I got stuck. I’m trying to apply a function to another function with recursion (higher-order function). Let’s say I have an input that can be a variable or an array, for example: My basic function…
Javascrip cannot access object properties from map method
So i have been having some problems with javascript’s map method. For some reason i cannot access objects properties from map function. Even though i am using the function on an array. When i print out the object the output is; Output of console.log(marker) this is the output of console.log(hospitalMark…
Filter an array of objects by another object of filters
I have an array of objects who follow this structure below: I now want to filter an array of these objects by another object. This filterObject would have the structure below: But this filterObject doesn’t always have all the key-value pairs because they get set manually in the UI. As a result the filte…
Svelte UI not properly updated when Writable of Type Array is edited
I am currently working on a crew creator for a rowing club for context. The Writable containing the array is declared as such This is how im removing the specific item from the array Where mem is the Writable<CrewMember> passed into the delete function. I’ve also tried deleting by ID and that has …
Multiple arrays inside a array in javascript
when i do console.log(myArray) I obtain this: console.log result I want to take a value inside only one of this arrays, but how? When i do console.log(array[0]) I obtain this result: Answer From what I can see in the original question so far, the output of this function is actually three different console.log…
JavaScript Expense Tracker Calculator – Subtraction
Im trying to do a expense tracker with vanilla javascript that user can can add/remove their expense item and the Total of expense will be calculated accordingly. I am using constructor to create object so later I can save in localStorage later and retrieve later (hv not done this part yet) Here is the proble…