I’m trying to attach a method mytest to a function prototype: But I get: Uncaught TypeError: Cannot set property ‘mytest’ of undefined” Answer Even if you fix the fact that the arrow function has no prototype by using a regular function, you cant assign to the prototype of the value re…
TypeScript cant read property addEventListener
I’m learning TypeScript and I’m following a youtube tutorial that I did step by step. But for some reason I’m still receving a error. Uncaught TypeError: Cannot read property ‘addEventListener’ of null I rewrote the code twice and I’m still receiving the same error. Could u…
Remove an object with the same value of an array inside an array javascript
I have array like this: Then I filter the number to get a number that is less than or equal to 10 digits. Then returns an array with items that do not match a number. I then iterate through each of the above items, then push it into an empty array to get each individual item. And my final result
Add/Remove CSS Class with JS Loop
I have a navigation menu that displays a group of notes from the clicked topic. The note can either have class note if it is visible or class invisible if it is hidden. I want only the notes from the topic clicked to show. The problem is that some notes from other topics are also being shown. Even though the
React setState does not update a state array value
I am trying to change the state in a class component by using setState. More specific I have a table, and I want to edit/update one of its elements. For this case, I am passing the indeces to the handleTableFieldOnChange function for the position of the value in the array. Since I know that I should not mutat…
Should I write all my route handling code in a try-catch block?
Is this good use of try…catch, or should I write everything in try block? I am trying to prevent nested try…catch blocks. Answer You’ll never need to nest try/catches – a catch() will catch all errors underneath it. See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/t…
How to log response status log in postman
How do I console the response status code in Postman ? I have this snippet here: I want to log response status code 200 if I get it. Thank you in advance Answer you can get it from pm.response object in test script section
TypeError: jwt(…).unless is not a function when mocking with Jest
I am trying to mock the .unless function of express-jwt and currently have this mock setup to compare a JWT with an admin and non admin. This worked perfect until we added .unless and I am not sure the best way to approach the issue. That is the mock. I have tried moving that into a const and adding: mockFun.…
toString() method vs string representation
I have: In the second line, what does the notation using square brackets mean? The console.log() documentation says the “string representation” of the object argument is printed. If that is not the same as the toString() function of the Number object, where is the string representation of an objec…
‘unexpected quantifier’ regexp error in IE11
I have a strings like SHM{GHT} and need to get a value from brackets (GHT in this example). I use RegExp to get it and everything worked fine before I open it in IE. My page broke here and I got an error unexpected quantifier. Here is my function I checked on CanIUse .match() should work fine, something wrong…