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 trueTherefore, let’s write the code for this function.ExampleThe code for this will be −const arr = ["c", "ca", "can", "acan", "acane", "dacane"]; const isProgressive = arr => {    for(let ... 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';Therefore, let’s write the code for this function −ExampleThe code for this will be −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, ... Read More

We are required to write a JavaScript function that takes in two numbers and returns their difference but without using the (-) sign.Therefore, let’s write the code for this function −ExampleThe code for this will be −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 that contains all similar elements but one.Our function should return the unlike number.Therefore, let’s write the code for this function −ExampleThe code for this will be −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];     ... Read More

We are required to write a JavaScript function that takes in a lowercase string and returns a new string in which all the elements between [a, m] are represented by 0 and all the elements between [n, z] are represented by 1.ExampleThe code for this will be −const str = 'Hello worlld how are you'; const stringToBinary = (str = '') => {    const s = str.toLowerCase();    let res = '';    for(let i = 0; i < s.length; i++){       // for special characters       if(s[i].toLowerCase() === s[i].toUpperCase()){          res ... Read More

We are required to write a JavaScript function that takes in a number and returns the first prime number that appears after n.For example: If the number is 24, then the output should be 29.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num = 24; const isPrime = n => {    if (n===1){       return false;    }else if(n === 2){       return true;    }else{       for(let x = 2; x < n; x++){          if(n % x === 0){             return false;          }       }       return true;    }; }; const nearestPrime = num => {    while(!isPrime(++num)){};    return num; }; console.log(nearestPrime(24));OutputThe output in the console will be −29

We are required to write a JavaScript function that takes in a number n and returns a random string of length n containing no other than the 26 English lowercase alphabets.Therefore, let’s write the code for this function −ExampleThe code for this will be −const num = 8; const randomNameGenerator = num => {    let res = '';    for(let i = 0; i < num; i++){       const random = Math.floor(Math.random() * 27);       res += String.fromCharCode(97 + random);    };    return res; }; console.log(randomNameGenerator(num));OutputThe output in the console will be −kdcwpingNote − This is one of many possible outputs. Console output is expected to differ every time.

We are required to write a JavaScript function that takes in an array of Number / String literals and returns another array of arrays. With each subarray containing exactly two elements, the nth element from start nth from last.For example: If the array is −const arr = [1, 2, 3, 4, 5, 6];Then the output should be −const output = [[1, 6], [2, 5], [3, 4]];ExampleThe code for this will be −const arr = [1, 2, 3, 4, 5, 6]; const edgePairs = arr => {    const res = [];    const upto = arr.length % 2 === 0 ... Read More

We are required to write a JavaScript function that takes in an array that contains elements of different data types and the function should return a map representing the frequency of each data type.Let’s say the following is our array −const arr = [23, 'df', undefined, null, 12, {    name: 'Rajesh' }, [2, 4, 7], 'dfd', null, Symbol('*'), 8];ExampleFollowing is the code to return a map representing the frequency of each datatype −const arr = [23, 'df', undefined, null, 12, {    name: 'Rajesh' }, [2, 4, 7], 'dfd', null, Symbol('*'), 8]; const countDataTypes = arr => {   ... Read More

We are required to write a JavaScript function that takes in two arrays of numbers. And the function should return true if the two arrays upon combining and shuffling can form a consecutive sequence, false otherwise.For example: If the arrays are −const arr1 = [4, 6, 2, 9, 3]; const arr2 = [1, 5, 8, 7];Then the output should be true.Therefore, let’s write the code for this function −ExampleThe code for this will be −const arr1 = [4, 6, 2, 9, 3]; const arr2 = [1, 5, 8, 7]; const canFormSequence = (arr1, arr2) => {    const combined = ... Read More