In following example I am trying to get specific object from an array.First I am checking if it is there using find and after that getting only that object. Answer Fixed it in below snippet. Check it out.
I’m creating a shopping cart where in if I add to cart, the quantity should be added to the previous quantity. In my case it only sets to a quantity and is not adding. Here is the code that I tried: Answer Just needed a slight modification to the addition logic. You need to check if it already exists in the itemsInCart array before pushing it.
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 days ago. Improve this question “This program only displays one book. Make an array of books (at least two of them), and use a loop to display a row of them.” I want to use the for loop to draw the other book in the array. In the current state, i remains 0, and must be manually set to 1 to draw the next book. Answer Use a different variable
I was looking the w3cschool link for auto complete as you type. https://www.w3schools.com/howto/howto_js_autocomplete.asp The above only works for the first ordering for names eg. If country name is United States. You need to type Uni and it shows in drop-down. How to make it work if you type any letter eg ted or state so it still shows. United States in drop down. Answer All you need is do a includes string comparison instead of starts With and you should be all set if you just show the matching country instead f substring of matching text. https://jsfiddle.net/9ym4Lcta/1/
I have two arrays with the same information but different keys. The keys of the first array are strings: The second array is indexed normally: If I try to sort them by age: In the end myOtherArray will be sorted but myArray will remain sorted by key. What am I missing here? Thanks! Answer Your first array does not actually contain any elements; you are treating it like an object by setting properties on it, which are ordered in insertion order except for numeric keys which are ordered in ascending order. You used the standard push method to add to
This question concerns the Firestore database, but, more generally, it concerns making async requests in parallel. Simply put, I wish to update multiple Firestore documents as quickly and efficiently as possible by mapping over an array of their document IDs. the .set() method is async (returning a promise) and so I understand that I can wrap the multiple requests – i.e. the map() – in a Promise.all() function, which will return a single promise once all of the requests have resolved. However, it is not at all clear to me whether I should await the set() within the map(). Whichever
My question is pretty simple actually but I couldnt find satisfied answer lets say that I have array like above.And I wanna get the max value in array which is 20. this is what I did but returned undefined so I tried something like that below and worked but filtering all undefined elements(iterating all) and then finding biggest element is big cost.I need something built-in js function such as Math.max.apply which can skip undefined elements and find the biggest value from array. Answer As far as I understand your question, I would like to answer it. I have an idea