I am attempting to create a switch statement with two values.
switch ({'a': val_a,'b': val_b}){
case ({'x','y'}):
"some code here"
break;
}
However, this approach is not functioning as expected. Can anyone provide assistance? Thank you!
I am attempting to create a switch statement with two values.
switch ({'a': val_a,'b': val_b}){
case ({'x','y'}):
"some code here"
break;
}
However, this approach is not functioning as expected. Can anyone provide assistance? Thank you!
The switch operator is limited to comparing primitives and cannot directly compare objects. However, you can create a primitive value by concatenating strings.
const compareValue = val_a + ' ' + val_b;
switch (compareValue){
case 'x y':
//"some code here"
break;
}
When using a case statement, it is important to note that the value must be either a constant, a literal, or an expression that results in a constant or literal. It is not possible to use objects directly within a switch statement and have underlying case statements containing their own objects for comparison.
However, in JavaScript, there are options available that allow you to manipulate an object for comparison purposes. An approach that can be taken is as follows:
let obj = {'a': 'x','b': 'y'};
let obj1={'a':'x','b':'y'};
switch(Object.values(obj).join(','))
{
case Object.values(obj1).join(','):
console.log('evaluation succeeds');
break;
}
In this example, the values of the objects are converted into strings by joining them with commas, allowing for comparison within the case statement.
if(obj1.a === obj2.a && obj1.b === obj2.b) {
console.log('The conditions are met');
}
Understanding whether you're dealing with a genuine JavaScript object or if you need to convert JSON into an object is crucial. In either scenario, your switch case statement must encompass the entire object for it to function correctly.
Here's an example of how it should be structured:
const obj = { a: "value_a", b: "value_b" };
switch (obj) {
case { a: "value_a", b: "value_b" }:
// include your code here
break;
default:
case { a: "value_a2", b: "value_b3" }:
// include your code here
break;
}
If your case needs to match a single property instead, the structure would be like this:
switch (obj.a) {
case "value_a":
// include your code here
break;
default:
case "value_a2":
// include your code here
break;
}
Currently, I am creating a test for a method within NestJs that is responsible for initiating a Paypal Payment intent. When I execute either the yarn test:watch or simply yarn test command, the test described below runs successfully and passes. However, up ...
Encountering an error when trying to import jszip into my TypeScript component file. After successfully running npm install jszip and confirming the package is properly installed, I proceed to import it using: import * as JSZip from 'jszip'; Th ...
While troubleshooting my TCP JSON stream on the live server, I discovered that if the data streamed to me in JSON format is excessive, it doesn't consistently parse correctly. It requires multiple streams for successful parsing. Here is the code I am ...
In my TypeScript file, I have an array of objects called PropertiesParams: const PropertiesParams = [{ Name: 'FirstName', Filter: 'Like1' }, { Name: 'LastName', Filter: 'Like2' }, { Name: ...
One of my coworkers has created a backend application using Spring Boot. Strangely, I can only access the API when both our computers are connected to the same hotspot. If I try to access the other computer's API and port through a browser or Postman, ...
Issue at Hand: In the scenario illustrated below, there is a side navigation bar containing options that reveal a toggled section upon clicking. Specifically, if you select the third item labeled "Dolar" from the menu, a dropdown with three additional cho ...
I'm currently learning Angular 6 and I have a requirement to mark checkboxes based on specific IDs from two arrays: this.skillArray = [ {ID: 1, name: "Diving"}, {ID: 2, name: "Firefighting"}, {ID: 3, name: "Treatment"}, ...
Implementing basic collapse in Angular using ElementRef has proven to be a challenge for me, especially when dealing with HTML content within an ngFor loop. I need to pass the index value to the click event so it can retrieve the ID of the element. Check ...
My goal is to incorporate pinch zoom and panning using hardware-accelerated CSS properties like transform: translate3d() scale3d(). After completing the gesture, I reset the transform and switch to CSS zoom along with absolute positioning. This method ensu ...
I have been working on implementing heapsort in JavaScript, but I've encountered an issue with an undefined element at position array.length - 2, and the element at index 0 is not sorted. Here is the code snippet: var heapSort = function(array) { ...
I am searching for a method to integrate multiple Angular applications into a single shell Angular application. The concept involves having different teams develop separate Angular apps that can be loaded within a main shell app visible to end users. Thi ...
I am currently experimenting with the beta version of Vue 3 and encountering an issue while trying to access a ref in the setup function. Here is my component: JS(Vue): const Child = createComponent({ setup () { let tabs = ref() console.log(t ...
In the process of developing an API using the next.js app router, I encountered an issue. Specifically, I was successful in parsing the data with const res = await request.json() when the HTTP request type was set to post. However, I am facing difficulties ...
While working with Angular 7 dynamic forms, I encountered an error that I'm struggling to resolve. As a newcomer to Angular, this has been quite challenging for me. import { Component } from '@angular/core'; import {FormBuilder, FormArray} ...
I have a challenge of building a rich text editor for my web app, specifically for creating blog posts that will be saved in the database for user viewing. Initially, I planned to use a form with input fields where the title and content of the blog post w ...
Component A has all the necessary functionalities, and I want to use it in Component B. The code for ComponentA.ts is extensive, but it's not written in a service. How can I utilize the logic from Component A without using a service, considering both ...
Here is the situation: <script type="text/javascript" src="http://xy.com/something.js"></script> This code snippet in my PHP/HTML file loads the entire something.js file. Inside that file, there are lines containing "document.write..." which ...
Need help with a text input that is required and must be longer than 3 characters. When clicking on the input, if a user types something shorter than 3 characters and then clicks out, a red border should be added. Otherwise, the border should be green. ...
Why is the Next.js catch all route not working as expected with the getStaticPaths function? The documentation states that I should be able to navigate to both t/a.cat and t/a.cat/a.id, but it only seems to work for the latter. What could be causing this ...
I need to verify if a user has admin privileges. Every time I try calling the verifyAdminUser function from my router, I encounter the following error: Error: Route.post() requires callback functions but got a [object Undefined] at Route.(anonymous func ...