Learn how to create a callback function in JavaScript and use it for various purposes, such as asynchronous programming, modularity, flexibility, and custom events.

Note that the argument being passed to map above is an arrow function! In each iteration through the nums array, map passes the value of the current element to the arrow function as an argument and it ...

Write a function which takes two arguments - an array and a value. If the value provided in the argument is found in the array, the function should return the position of the element in an array. If ...