my state looks like this: const [options, setOptions] = useState({ numbers: false, animals: false, greetings: false, food: false, colors: false, other: true }) and I’m trying to update a single boolean based on a checkbox. At first I used a switch statement like so: but I think as I add more options, I&…
Tag: object
How do i initialise an array of object in constructor in JavaScript
I would like to create a class with an array of object in the constructor. The idea is to create rects in a canvas with the values inside the objects. I have this array: I tried the following: Thanks for your help. Answer As already written, the addition of this works. See example with this.boxs
How to create multiple array of objects from single array of objects based on property value
If I have array of objects like this one I want to group it by property value How to create three new separate arrays of objects based on fieldname ( or single array that contains those arrays of objects ) something like this Answer you can first unique the array and next push them to groupedArray like this:
How to group nested array of objects in js
I have a nested array of objects. I’m trying to group product objects that have the same value. Each objects has a vendor property containing an email. I am trying to group the objects by matching vendor email This is how my database looks like: I am trying to do it with the reduce method but the proble…
Pass an object’s method to a function in Javascript. Is this the correct interpretation of the question?
I was in an interview, and there was this question: When the method X of an object O is passed to a function Y as a parameter, what happens if X contains a reference to ‘this’ and gets executed inside Y? Please provide code examples. Is this code a correct interpretation of the question? Could you…
Get Names of Array of Objects without Looping
I have an array of country objects (countries) and I’m trying to get just an array of the String names, so from this example: Just: [‘Canada’, ‘USA’, ..] etc. I’m trying to do this with but I can’t seem to get it. Any suggestions? Answer You’re quite close to ge…
How to rearrange array of objects into object of objects in node js?
I have Java script array like this: I need to convert above array of objects arr into object with key-value pair like below I need the it like this JSON, in the form of key-value pair. How can I achieve this? I need the data like this in order to render the output, can someone please help me with this?
Count frequency of specific value in JavaScript object
I have a JavaScript object that is structured as such: var subjects = {all: “inactive”, firstSingular: “active”, secondSingular: “inactive”, thirdSingular: “active”, firstPlural: “inactive”, secondPlural: “inactive”, thirdPlural: “i…
javascript typescript create a object
i have a property like this “data.property” = “16165456”.. i try to create a object like this i use split and and loop but not work Answer A few issues: currentObject[part] = currentObject[part] is a statement that accomplishes nothing. You’d want to indicate what to assign when …
How to join two array conditionally based on the date in javascript
I have two arrays of users which have the same iDs. I want to merge them based on the updatedAt property that each user has. The user who has newer updatedAt property has priority. Output should be ] Answer You can use Array.reduce() to group users by id, replacing any entry with a newer updatedAt property. O…