We are required to write a JavaScript function that takes in a string and returns the character which makes second most appearances in the string.ExampleFollowing is the code −const str = 'Hello world, I have never seen such a beautiful weather in the world'; const secondFrequent = str => {    const map = {};    for(let i = 0; i < str.length; i++){       map[str[i]] = (map[str[i]] || 0) + 1;    };    const freqArr = Object.keys(map).map(el => [el, map[el]]);    freqArr.sort((a, b) => b[1] - a[1]);    return freqArr[1][0]; }; console.log(secondFrequent(str));OutputFollowing is the output in the console −e

We are required to write a JavaScript function that takes in a string and starts mapping its characters from 0. And every time the function encounters a unique (non-duplicate) character, it should increase the mapping count by 1 otherwise map the same number for duplicate characters.For example − If the string is −const str = 'heeeyyyy';Then the output should be −const output = [0, 1, 1, 1, 2, 2, 2, 2];ExampleFollowing is the code −const str = 'heeeyyyy'; const mapString = str => {    const res = [];    let curr = '', count = -1;    for(let i ... Read More

We are required to write a JavaScript function that takes in a number and the function establishes if the provided number is a semiprime or not.SemiprimeA semiprime number is that number which is a special type of composite number that is a product of two prime numbers. For example: 6, 15, 10, 77 are all semiprime. The square of a prime number is also semiprime, like 4, 9, 25 etc.ExampleFollowing is the code to check semi-prime numbers −const num = 141; const checkSemiprime = num => {    let cnt = 0;    for (let i = 2; cnt < ... Read More

We are required to write a JavaScript function that takes in an array of numbers and reorders the digit of all the numbers internally in a specific order (lets say in ascending order for the sake of this problem).For example − If the array is −const arr = [543, 65, 343, 75, 567, 878, 87];Then the output should be −const output = [345, 56, 334, 57, 567, 788, 78];ExampleFollowing is the code −const arr = [543, 65, 343, 75, 567, 878, 87]; const ascendNumber = num => {    const numArr = String(num).split('').map(el => +el);    numArr.sort((a, b) => a ... Read More

We are required to write a JavaScript function that takes in a string and returns the count of redundant characters in the string.For example − If the string is −const str = 'abcde'Then the output should be 0If the string is −const str = 'aaacbfsc';Then the output should be 3ExampleFollowing is the code −const str = 'aaacbfsc'; const countRedundant = str => {    let count = 0;    for(let i = 0; i < str.length; i++){       if(i === str.lastIndexOf(str[i])){          continue;       };       count++;    };    return count; }; console.log(countRedundant(str));OutputFollowing is the output in the console −3

We are required to write a JavaScript function that takes in an array of strings, ordered by ascending length.The function should return true if, for each pair of consecutive strings, the second string can be formed from the first by adding a single letter either at the beginning or end.For example: If the array is given by −const arr = ["c", "ca", "can", "acan", "acane", "dacane"];Then our function should return true.ExampleFollowing is the code −const arr = ["c", "ca", "can", "acan", "acane", "dacane"]; const isProgressive = arr => {    for(let i = 0; i < arr.length-1; i++){     ... Read More

We are required to write a function that takes in an array of exactly five elements representing the five cards of a poker player drawn randomly.If the five cards contain at least one pair, our function should return the card number of the highest pair (trivial if there only exists a single pair). Else our function should return false.For example: If the array is −const arr = ['A', 'Q', '3', 'A', 'Q'];Then our function should return −'A'  (as 'A' > 'Q' in card games)ExampleFollowing is the code −const arr = ['A', 'Q', '3', 'A', 'Q']; const greatestPair = arr => ... Read More

We are required to write a JavaScript function that takes in a string and returns a new string with the last vowel of each word removed.For example − If the string is −const str = 'This is an example string';Then the output should be −const output = 'Ths s n exampl strng';ExampleFollowing is the code −const str = 'This is an example string'; const removeLast = word => {    const lastIndex = el => word.lastIndexOf(el);    const ind = Math.max(lastIndex('a'), lastIndex('e'), lastIndex('i'),    lastIndex('o'), lastIndex('u'));    return word.substr(0, ind) + word.substr(ind+1, word.length); } const removeLastVowel = str => { ... Read More

We are required to write a JavaScript function that takes in two numbers and returns their difference but without using the (-) signExampleFollowing is the code −const num1 = 56; const num = 78; const subtractWithoutMinus = (num1, num2) => {    if(num2 === 0){       return num1;    };    return subtractWithoutMinus(num1 ^ num2, (~num1 & num2)

We are required to write a JavaScript function that takes in an array of literals containing all similar elements but one. Our function should return the unlike number.ExampleFollowing is the code −const arr = [2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4]; // considering that the length of array is atleast 3 const findUnlike = arr => {    for(let i = 1; i < arr.length-1; i++){       if(arr[i] - arr[i-1] !== 0 && arr[i]-arr[i+1] === 0){          return arr[i-1];       }else if(arr[i] - arr[i-1] !== 0 && arr[i]-arr[i+1] === ... Read More