GOAL: add all elements from an array of integers and arrays, each child array is a set of 2 integers denoting a start and end of a range. HTML invocation: I have the following JavaScript: When I invoke the onclick JavaScript the output is: Both the range passed and the elements constructed by the range() func…
Category: Questions
React Simple Compont is not rendering inside the browser
Hi have create a sample function and called inside the RenderDOM But seeing in the brower end the output is not showing Do anyone have any suggestion What is wrong with this code Answer React component needs to be in capitalizing first letter: You can see it in the log error: So change it to:
How can I change JSON file with javascript
I want to change my JSON file or add an element to my SON file, but real file. I tried this code, but it doesn’t work on the real file. Only the time the tab is open on the web has changed. How to handle it in real file? Not user file, it is server file, but I tried my
useEffect doesn’t fire when data change
I created a table with filter. every thing worked well. Later on, I wanted to change the filters from material ui to Core ui. I created one filter and tried to test it before moving. But it didn’t work. The problem that useEffect doesn’t fire no matter what. I even tried to put variable x and incr…
Change game without changing the games added before
Im consuming a json file with the some games. I want to add a new Game and the chooseGameToAdd() choose what game will be without changing the games added before Json file: Code: Answer The problem is you do not have an id in the JSON objects, but you use item.id as the key. If you were actually using typescr…
React-router get optional query parameter
i have been looking into some examples on stack overflow for defining optional query params in react-router and finally found out that it can be done like so at next step i want to retrive the query param that is “journyeId” if it is there, so i tried with but that doesn’t seems to work, wha…
Ergonomic way of only adding a new object to a map if it doesn’t exist?
I am developing a game where it is very often that I wish to perform the following operation: if (!buffs.has(“shielding”)) { buffs.add(new ShieldingBuff(50)); // 50 is the shield amount } …
fetching data in react returns an empty array
i’m fetching data from my backend api and setting the data to my state but it’s returning an empty array and idk why this happening even though in other components it works just fine this is my code : Answer I was just missing a return in the .map function
React Native Elements marginEnd wont position element to the right of its parent container
I have some nested components: TEXT and an Image. I would like the button in the blue box to move to the right in the black box (parent). marginRight: 0 and marginEnd: 0 arent working. How can I accomplish this? What is currently Happening. What I want. StyleSheet Answer or
Undefined from promise using .then() JavaScript
I am trying to get data from Firestore using multiple queries, but the returned data is always undefined, even though console.log(data) in .then() block shows the data exist. Answer You have to return the promise in your function getPeers(): EDIT: A little advice when handling errors in async functions, in yo…