ProblemWe are required to write a JavaScript function that takes in an array of two numbers [a, b] (a {    if(lower > upper){       return [];    };    const res = [];    for(let i = lower; i

ProblemWe are required to write a JavaScript function that takes in a number n. And our function should simply return the nth even number in natural numbers.ExampleFollowing is the code − Live Democonst num = 67765; const nthEven = (num = 1) => {    const next = num * 2;    const res = next - 2;    return res; }; console.log(nthEven(num));Output135528

ProblemWe are required to write a JavaScript function that takes in a string of digits. Our function should replace any digit below 5 with '0' and any digit 5 and above with '1' and return the resulting string.ExampleFollowing is the code − Live Democonst str = '262355677834342'; const convert = (str = '') => {    let res = '';    for(let i = 0; i < str.length; i++){       const el = +str[i];       if(el < 5){          res += 0;       }else{          res += 1;       };    };    return res; }; console.log(convert(str));Output010011111100000

ProblemWe are required to write a JavaScript function that takes in an array of objects that contains data about the continent of belonging for some people.Our function should return true if it finds six different continents in the array of objects, false otherwise.ExampleFollowing is the code − Live Democonst people = [ { firstName: 'Dinesh', lastName: 'A.', country: 'Algeria', continent: 'Africa', age: 25, language: 'JavaScript' }, { firstName: 'Ishan', lastName: 'M.', ... Read More

ProblemWe are required to write a JavaScript function that takes in an object that contains data about some people.Our function should simply find the average of the age property for those people.ExampleFollowing is the code − Live Democonst people = [    { fName: 'Ashish', age: 23 },    { fName: 'Ajay', age: 21 },    { fName: 'Arvind', age: 26 },    { fName: 'Mahesh', age: 28 },    { fName: 'Jay', age: 19 }, ]; const findAverageAge = (arr = []) => {    const { sum, count } = arr.reduce((acc, val) => {       let { sum, count } = acc;       sum += val.age;       count++;       return { sum, count };       }, {          sum: 0, count: 0    });    return (sum / (count || 1)); }; console.log(findAverageAge(people));Output23.4

ProblemWe are required to write a JavaScript function that takes in an array that contains integers and string numbers.Our function should sum all the integers and string numbers together to derive a new number and return that number.ExampleFollowing is the code − Live Democonst arr = [67, 45, '34', '23', 4, 6, '6']; const mixedSum = (arr = []) => {    let sum = 0;    for(let i = 0; i < arr.length; i++){       const el = arr[i];       sum += +el;    };    return sum; }; console.log(mixedSum(arr));Output185

ProblemWe are required to write a JavaScript function that lives on the prototype object of Array.It must take in a literal value, and return true if that value is present in the array it is being called upon, false otherwise.ExampleFollowing is the code − Live Democonst arr = [1, 2, 3, 4, 5, 6, 7, 8]; const num = 6; Array.prototype.customIncludes = function(num){    for(let i = 0; i < this.length; i++){       const el = this[i];       if(num === el){          return true;       };    };    return false; }; console.log(arr.customIncludes(num));Outputtrue

ProblemWe are required to write a JavaScript function that takes in an array of numbers and a number. We should return true if all the numbers in the array are smaller than the number given as second argument, false otherwise.ExampleFollowing is the code − Live Democonst arr = [5, 34, 23, 14, 78, 45, 78]; const limit = 99; const checkEvery = (arr = [], limit = 1) => {    const allSmaller = arr.every(el => {       return el < limit;    });    return allSmaller; }; console.log(checkEvery(arr, limit));Outputtrue

ProblemWe are required to write a JavaScript function that takes in takes in an array of numbers. If in that array there exists any number which is the char code any vowel in ascii we should switch that number to the corresponding vowel and return the new array.ExampleFollowing is the code − Live Democonst arr = [5, 23, 67, 101, 56, 111]; const changeVowel = (arr = []) => {    for (let i=0, l=arr.length; i

ProblemWe are required to write a JavaScript function that takes in an array of strings.Our function should return the first string of the array after sorting it alphabetically and each character of that string should be separated by ‘***’.ExampleFollowing is the code − Live Democonst arr = ['this', 'is', 'some', 'string', 'array']; const specialSort = (arr = '') => {    const copy = arr.slice();    copy.sort();    const el = copy[0];    const res = el    .split('')    .join('***');    return res; }; console.log(specialSort(arr));Outputa***r***r***a***y