We are required to write a JavaScript function that takes in an array of integers as the only argument.The function should first permute all possible subarrays from the original array that have an odd length. And then the function should find the combined sum of all the elements of those subarrays and return the sum.For example −If the input array is −const arr = [1, 2, 3];Then the output should be −const output = 12;because the desired subarrays are [1], [2], [3], [1, 2, 3]ExampleFollowing is the code −const arr1 = [1, 2, 3]; const arr2 = [1, 2, 3, ... Read More

We are required to write a JavaScript function that takes in an array of integers as the only argument.The function should determine whether there exists any way in which we can split the array into two subarray such that the sum of the elements present in the two subarrays are equal. While dividing the elements into subarrays we have to make sure that no element from the original array is left.For example −If the input array is −const arr = [5, 3, 7, 4, 1, 8, 2, 6];Then the output should be −const output = true;because the desired subarrays are: ... Read More

We are required to write a JavaScript function that takes in a string of characters as the only argument.The function should find that longest string which is sandwiched between two identical characters and return its length.For example −If the input string is −const str = 'sadtrsewak';Then the output should be −const output = 6;because between two 'a' we have the longest desired substring of length 6.ExampleFollowing is the code −const str = 'sadtrsewak'; const longestSubstringBetween = (str = '') => {    const map = {};    let res = -1;    for(let i = 0; i < str.length; i++){ ... Read More

We are required to write a JavaScript function that takes in a string as the first and the only argument. The function should return true if all the characters present in the string are unique. And if even one character appears for more than one, the function should return false.We will use a hash set to keep track of the characters we encounter in the string and if at any stage of iteration, we encounter duplicate characters, we will return false otherwise at the end of iteration, we will return true.ExampleFollowing is the code −const str = 'abschyie'; const checkUniqueness ... Read More

We are required to write a JavaScript function that takes in an array of integers as the first and the only argument.The function should find the maximum product that can be achieved multiplying any two elements of the array. The condition for us is that we have to do this in linear time and constant space.For example −If the input array is −const arr = [3, 9, 2, 1, 0];Then the output should be −const output = 27;because it’s the greatest product and can be achieved by multiplying 3 and 9.ExampleFollowing is the code −const arr = [3, 9, 2, ... Read More

We are required to write a JavaScript function that takes in a string as the first and the only argument.The function should detect if the string is a repetition of a same set of characters or not.If it is a repetition of the same set of characters then we should return true, false otherwise.For example −If the input string is −const str = 'carcarcarcar';Then the output should be −const output = true;because the string 'car' is getting repeated over and over again in the string.ExampleFollowing is the code −const str = 'carcarcarcar'; const isRepeating = (str = '') => { ... Read More

We are required to write a JavaScript function that takes in a string of characters as the first argument, say str, and a number, say num, as the second argument.The function should count the number of palindrome strings all exactly of length num can be constructed from the given string str. The function should then finally return the count.For example −If the input string and the number is −const str = 'ij'; const num = 4;Then the output should be −const output = 4;because those four possible palindrome strings are −'iiii', 'jjjj', 'ijji', 'jiij'Approach:We will first count the number of ... Read More

Effectively manipulating data structures is a crucial aspect of contemporary software development. In JavaScript, one typical task is relocating all the zeros in an array to the end, while preserving the order of the non-zero elements. Although various methods exist to achieve this, the in-situ algorithm is a particularly potent technique that avoids the necessity of extra data structures. In this discourse, we will scrutinize the complexities of the in-situ algorithm to move zeros to the end of an array in JavaScript, probing the underlying reasoning and offering systematic instructions for execution. By mastering this technique, software developers can refine ... Read More

We are required to write a JavaScript function that takes in a string of characters as the only argument.The function should build and return the acronym based on the string phrase provided as input.While constructing the acronym the function should take only those words into consideration that starts with an uppercase letter.For example −If the input string is −const str = 'Polar Satellite Launch Vehicle';Then the output should be −const output = 'PSLV';ExampleFollowing is the code −const str = 'Polar Satellite Launch Vehicle'; const buildAcronym = (str = '') => {    const strArr = str.split(' ');    let res ... Read More

We are required to write a JavaScript function that takes in a two-dimensional array of integers as the only argument.The task of our function is to calculate the count of all such integers from the array that are the greatest both within their row and the column.The function should then return that count.For example −If the input array is −const arr = [    [21, 23, 22],    [26, 26, 25],    [21, 25, 27] ];Then the output should be −const output = 3;because those three numbers are 26, 26, 27ExampleFollowing is the code −const arr = [    [21, ... Read More