Suppose we have an array of two elements with both of its elements being two asynchronous functions. We are required to do some work, say print something to the console (for the purpose of this question) when the execution of both the async function completes.How can we approach this challenge?There ... Read More

We are required to write a function which compares how many values match in an array. It should be sequence dependent. That means i.e. the first object in the first array should be compared to equality to the first object in the second array and so on.For example −If the ... Read More

Let’s say, we have a special kind of string that contains characters in couple, like this −const str = "AABBCCDDEE";We are required to construct an object based on this string which should look like this −const obj = {    code: "AA",    sub: {        code: "BB", ... Read More

Suppose, we have two arrays of literals like these −const arr1 = [4, 23, 7, 6, 3, 6, 4, 3, 56, 4]; const arr2 = [4, 56, 23];We are required to write a JavaScript function that takes in these two arrays and filters the first to contain only those elements ... Read More

Suppose, we have an array and an object like these −const arr = [1, 2, 3, 4, 5]; const obj = {    group1: ["Ram", "Mohan", "Shyam"],    group2: ["Jai", "Dinesh"], };We are required to zip the array and the object so that the values in the array are assigned ... Read More

We have to write a function that takes in an array, removes all duplicates from it and inserts the same number of empty strings at the end.For example −If we find four duplicate values, we have to remove then all and insert four empty strings at the end.ExampleFollowing is the ... Read More

Let’s say, we have to write a simple function in JavaScript that takes in the following array of Numbers (nested to any level) −const arr = [    15, 24,    [        29, 85, 56,        [            36, 14, 6, ... Read More

Let’s say, we have an array of arrays of Numbers like below −const arr = [   [1, 16, 34, 48],   [6, 66, 2, 98],   [43, 8, 65, 43],   [32, 98, 76, 83],   [65, 89, 32, 4], ];We are required to write a function that maps ... Read More

Let’s say, we have an array of numbers −const arr = [3, 5, 7, 8, 3, 5, 7, 4, 2, 8, 4, 2, 1];We are required to write a function that returns an array with the average of the corresponding element and its predecessor. For the first element, as there ... Read More

Let’s say, we are required to write a function that returns the index of the very first element that appears at least twice in the array. If no element appears more than once, we have to return -1. We have to do this in constant space (i.e., without utilizing extra ... Read More