We are required to write a JavaScript function that takes in a string as the first argument, a number, say n, as the second argument and a character, say c, as the third argument. The function should replace the nth appearance of any character with the character provided as the third argument and return the new string.ExampleFollowing is the code −const str = 'This is a sample string'; const num = 2; const char = '*'; const replaceNthAppearance = (str, num, char) => {    const creds = str.split('').reduce((acc, val, ind, arr) => {       let { res, ... Read More

We are required to write a JavaScript function that takes in an array of numbers and returns a subarray that contains all the element from the original array that are larger than all the elements on their right.ExampleFollowing is the code −const arr = [12, 45, 6, 4, 23, 23, 21, 1]; const largerThanRight = (arr = []) => {    const creds = arr.reduceRight((acc, val) => {       let { largest, res } = acc;       if(val > largest){          res.push(val);          largest = val;       };       return { largest, res };    }, {       largest: -Infinity,       res: []    });    return creds.res; }; console.log(largerThanRight(arr));OutputFollowing is the output in the console −[ 1, 21, 23, 45 ]

A string can be considered as a valid hex code if it contains no characters other than the 0-9 and a-f alphabetsFor example −'3423ad' is a valid hex code '4234es' is an invalid hex codeWe are required to write a JavaScript function that takes in a string and checks whether its a valid hex code or not.ExampleFollowing is the code −const str1 = '4234es'; const str2 = '3423ad'; const isHexValid = str => {    const legend = '0123456789abcdef';    for(let i = 0; i < str.length; i++){       if(legend.includes(str[i])){          continue;       ... Read More

We are required to write a JavaScript function that takes in an positive integer and returns its additive persistenceThe additive persistence of an integer, say n, is the number of times we have to replace the number with the sum of its digits until the number becomes a single digit integer.For example −If the number is −1679583Then, 1 + 6 + 7 + 9 + 5 + 8 + 3 = 39   // 1 Pass 3 + 9 = 12                   // 2 Pass 1 + 2 = 3     ... Read More

We are required to write a JavaScript function that takes in an array of numbers and checks if the elements of the array can be rearranged to form a sequence of numbers or not.For example −If the array is −const arr = [3, 1, 4, 2, 5];Then the output should be −trueExampleFollowing is the code −const arr = [3, 1, 4, 2, 5]; const canBeConsecutive = (arr = []) => {    if(!arr.length){       return false;    };    const copy = arr.slice();    copy.sort((a, b) => a - b);    for(let i = copy[0], j = 0; ... Read More

We are required to write a JavaScript function that checks whether a sentence is smooth or not. A sentence is smooth when the first letter of each word in the sentence is same as the last letter of its preceding word.ExampleFollowing is the code −const str = 'this stringt tries sto obe esmooth'; const str2 = 'this string is not smooth'; const isSmooth = str => {    const strArr = str.split(' ');    for(let i = 0; i < strArr.length; i++){       if(!strArr[i+1] || strArr[i][strArr[i].length -1] === strArr[i+1]       [0]){          continue; ... Read More

In Mathematics, a strictly increasing function is that function in which the value to be plotted always increase. Similarly, a strictly decreasing function is that function in which the value to be plotted always decrease.We are required to write a JavaScript function that takes in an array of numbers and returns true if it’s either strictly increasing or strictly decreasing, otherwise returns false.ExampleFollowing is the code −const arr = [12, 45, 6, 4, 23, 23, 21, 1]; const arr2 = [12, 45, 67, 89, 123, 144, 2656, 5657]; const sameSlope = (a, b, c) => (b - a < 0 && c - b < 0) || (b - a > 0 && c - b > 0); const increasingOrDecreasing = (arr = []) => {    if(arr.length

We are required to write a JavaScript function that takes in three numbers say a, b and c representing the length of three sides of a triangle. The function should return true if those three sides represent a right-angle triangle, false otherwise.Right angle triangleA triangle is a right-angle triangle if one of the three angles in the triangle is 90 degree. And one angle in the triangle is 90 degrees when the square of the longest side is equal to the sum of squares of the other two sides.For example − 3, 4, 5, as3*3 + 4*4 = 5*5 = ... Read More

We are required to write a JavaScript function that takes in a number as the first argument, say n, and an array of numbers as the second argument. The function should return the smallest n digit number which is a multiple of all the elements specified in the array. If there exist no such n digit element then we should return the smallest such element.For example: If the array is −const arr = [12, 4, 5, 10, 9]For both n = 2 and n = 3, the output should be 180ExampleFollowing is the code −const arr = [12, 4, 5, ... Read More

We have an array of arrays like this −const arr = [[12, 56], [3, 45], [23, 2], [2, 6], [2, 8]];Note that while the array can have any number of elements, each subarray should strictly contain two numbers.The two numbers in each subarray represents a fraction. For example, the fraction represented by the first subarray is 12/56, by the second is 3/45 and so on.We are required to write a JavaScript function that takes in one such array and calculates the sum of fractions represented by all the subarrays. Calculate the sum in fraction form (i.e., without converting them to ... Read More