I have to write the body of a function getABC() which essentially has to take in responses from 3 different functions, getA()(synchronous),getB(callback)(callback driven),getC() (promise based). Ultimately I have to return a promise aggregating each function’s result, like [(result of getA),(result of g…
Tag: callback
How should I use the callback to get the desired outcome?
Hello there I am getting the desired result when am using promise but how should I implement it with callback when am returning something from the function. result with promise *** using callback *** OUTPUT should be I am first I am second I am third Answer You don’t need that global temp variable, and …
Svelte: Get User Input Callback via Store Function
What I’m trying to do here may not be possible, but as a newcomer to Svelte, I hope it is. 😄 I have a delete button in a component that opens a globally available modal that serves as a confirmation dialog. The modal component is in my __layout.svelte so I can invoke it from anywhere in my app. Here is…
How to do an action after callback in node?
How to fire the final console.log AFTER the callback is finished. Answer The easiest way is to just log the final line from within the callback:
How to update my useEffect hook when State change happen in a different .js file’s component in ReactJS?
I am trying to make an API call in useEffect() and want useEffect() to be called everytime a new data is added in the backend. I made a custom Button(AddUserButton.js) which adds a new user in backend. I am importing this button in the file (ManageUsers.js) where I am trying to display all the users. I just w…
Function parameter is not defined in callback
I am trying to get the location of the user and using that I am trying to get the city. I don’t why but when I call the query function, the city parameter is having some value but it is not reflected in the callback function’s if condition. However, if I replace the city variable in the If conditi…
I m getting confuse why I am getting the second Result first..?
Now the issue is when I am calling (first function) this is giving me the (second) first, I just wanted to know what is exactly happening here how this is working..? and how the second function’s value is passing inside first function..? (because there is no parameter inside first function) Answer Let&#…
What is the lexical environment inside a callback function?
I keep hearing that arrow functions inherit the value of this from their Lexical Environment. Consider this example: Why is the value of this inside the arrow callback functions undefined (or in non-strict mode: window)? If the callback function is using the value of this from its lexical environment, shouldn…
Callback error when calling endpoint function
I’ve received an Node.js api documented with swagger for debbuging. I also have to make some features in it, but I’m having some trouble when calling, in the code, the functions executed when you hit an specific endpoint. To make my self clear: Works fine from Swagger UI when I only give it the ar…
Using Promise in a for loop, all the .then came later is always be called untill all the first .then is finished running, why is that?
I am new to JavaScript and with the concept of Promise. And I am doing test. I created a promise and two for loop that runs Promise for 6 times in total, and I knows when they got executed by console.log() Here’s my code and here’s how the console be like: Why is the second .then and all the .fina…