Category "undefined"

React.js giving TypeError : Cannot read properties of undefined (reading 'length')

<MDBRow className="mt-5"> {tours.length === 0 && ( <MDBTypography className="text-center mb-0" tag="h2"> No T

TypeScript(err:2532): object is possibly undefined dispite null/undefined check

I've been writing a Discord-bot in TypeScript and I added a command that retrieves information from an airport. The only thing you have to provide is the ICAO c

TypeError: ctx.product is undefined

Help ! I'm getting the following error from my Angular (material) application: TypeError: ctx.product is undefined my service:product.service.ts @Injectable

react evironment variables .env return undefined

I am building a react app and i need to fetch data from my api, now i want to store the api url as an environment variable. I have my .env file, i have dotenv i

Undefined Error when Fetching API using RTK Query React/Redux

I keep getting this same error of undefined data for multiple components in my data, it was working fine but for some reason it stops in fetching data and start

Reference error window not defined error in Web3

Here is my code: import Web3 from './web3'; if (window.ethereum) { window.web3 = new Web3(ethereum); try { // Request account access if needed

ES6 modules - imported constants undefined if not in React component

The only similar question I have found is this one but I can't see how would I have caused a circular dependancy in this case: I have a file exporting constants

"undefined" function declared in another file?

I'm trying to write a basic go program that calls a function on a different file, but a part of the same package. However, it returns: undefined: NewEmployee

Passing Variable through JavaScript from one html page to another page

I have two pages - "page 1" and "page 2". On page 1 there's an text-box with a value of e.g. 100 and a button at the end. By pressing the button I want javascr

javascript initialize to undefined or null or ""

Java script has many falsy values as I started learning. I have a program that gets values from a service and loads into an array like this: function loadNames

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