ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.The array, arr, of length N contains all integers from 0 to N-1. Our function is supposed to find and return the longest length of set S, where S[i] = {A[i], A[A[i]], A[A[A[i]]], ... } subjected to the rule below.Suppose the first element in S starts with the selection of element A[i] of index = i, the next element in S should be A[A[i]], and then A[A[A[i]]]… By that analogy, we stop adding right before a duplicate element ... Read More

ProblemWe are required to write a JavaScript function that takes in a 2-D array of numbers, arr, as the first argument and two numbers, r and c, representing the row number and column number of the desired matrix, respectively.Our function should form and return a new 2-D array with the specified rows and columns in the same row-traversing order as they were in the input array.For example, if the input to the function is −const arr = [    [6, 7],    [8, 9] ]; const r = 1, c = 4;Then the output should be −const output = [[6, 7, 8, ... Read More

ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.Our function needs to find the length of one continuous subarray such that if we only sort this subarray in ascending order, then the whole array will be sorted in ascending order, too.For example, if the input to the function is −const arr = [3, 7, 5, 9, 11, 10, 16];Then the output should be −const output = 5;Output ExplanationBecause if we sort [7, 5, 9, 11, 10], the whole array will be sorted.ExampleFollowing is the code − Live ... Read More

ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argumentOur function should find and return the length of such a subarray where the difference between its maximum value and its minimum value is exactly 1.For example, if the input to the function is −const arr = [2, 4, 3, 3, 6, 3, 4, 8];Then the output should be −const output = 5;Output ExplanationBecause the desired subarray is [4, 3, 3, 3, 4]ExampleFollowing is the code −const arr = [2, 4, 3, 3, 6, 3, 4, 8]; const ... Read More

ProblemWe are required to write a JavaScript function that takes in two nested arrays, arr1 and arr2, as the first and the second argument.Our function should create and return a third array that contains all the elements of arr1 and arr2 but flattened to single dimensionFor example, if the input to the function is −const arr1 = [    1, [       2, [          4, 5, [             6          ]       ]    ] ]; const arr2 = [    11, 12, [ ... Read More

ProblemWe are required to write a JavaScript function that takes in a string, str, which contains a combination of alphabets, special characters and numbers.Our function should return a new string based on the input string that contains only the numbers present in the string str, maintaining their relative order.For example, if the input to the function is −const str = 'revd1fdfdfs2v34fd5gfgfd6gffg7ds';Then the output should be −const output = '1234567';ExampleFollowing is the code − Live Democonst str = 'revd1fdfdfs2v34fd5gfgfd6gffg7ds'; const pickNumbers = (str = '') => {    let res = '';    for(let i = 0; i < str.length; i++){   ... Read More

ProblemWe are required to write a JavaScript function that takes in a lowercase English alphabets string, str, as the first and the only argumentOur function should create and return a new string based on the input string which contains characters sorted according to the reverse English alphabets.For example, if the input to the function is −const str = 'abcdef';Then the output should be −const output = 'fedcba';ExampleFollowing is the code − Live Democonst str = 'abcdef'; const reverseSorting = (str = '') => {    const strArr = str.split('');    const mapString = 'abcdefghijkmnopqrstuvwxyz';    const sorter = (a, b) => ... Read More

ProblemWe are required to write a JavaScript function that takes in two arrays of numbers, arr1 and arr2, as the first and the second arguments.Our function should merge the elements of both these arrays into a new array and if upon merging or before merging there exists any duplicates, we should delete the excess duplicates so that only one copy of each element is present in the merged array.The order here is not so important but the frequency of elements (which should be 1 for each element) is important.For example, if the input to the function is −onst arr1 = ... Read More

ProblemWe are required to write a JavaScript function that takes in a number, num, as the first and the only argument.Our function should return true if the sum of the digits of the number num is a palindrome number, false otherwise.For example, if the input to the function is −const num = 781296;Then the output should be −const output = true;Output ExplanationBecause the digit sum of 781296 is 33 which is a palindrome number.ExampleFollowing is the code − Live Democonst num = 781296; const findSum = (num, sum = 0) => { if(num){ return findSum(Math.floor(num / 10), sum + (num ... Read More

ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first argument and a number, num, (num {    const res = [];    let sum = 0, right = 0, left = 0;    for(; right < num; right++){       sum += arr[right];    };    res.push(sum);    while(right < arr.length){       sum -= arr[left];       sum += arr[right];       right++;       left++;       res.push(sum);    };    return res; }; console.log(accumulateArray(arr, num));OutputFollowing is the console output−[3, 5, 7, 9, 11]