We are required to write a JavaScript function that takes in two arrays of Numbers, say first and second and checks for their equality.The arrays will be considered equal if −They contain the same elements and in the same order.The product of all the elements of the first array and second array is equal.The first array of numbers −const first = [3, 5, 6, 7, 7];The second array of numbers −const second = [7, 5, 3, 7, 6];ExampleFollowing is the code −const first = [3, 5, 6, 7, 7]; const second = [7, 5, 3, 7, 6]; const isEqual = ... Read More

We are required to write a JavaScript function that takes in two strings say, str1 and str2. The function should determine whether or not str1 ends with str2. Our function should return a boolean on this basis.Here’s our 1st string −const str1 = 'this is just an example';Here’s our 2nd string −const str2 = 'ample';ExampleFollowing is the code −const str1 = 'this is just an example'; const str2 = 'ample'; const endsWith = (str1, str2) => {    const { length } = str2;    const { length: l } = str1;    const sub = str1.substr(l - length, length); ... Read More

In the decimal number system, all the real numbers can be divided into two groups −Rational NumbersIrrational NumbersFor the scope of this problem we will only discuss the rational numbers, All those numbers which can be written in the p/q (where q !== 0) form are called rational numbers.Like 14, 4.6, 3.33333... and many moreThe rational numbers, further can be divided into two groups −Terminating decimal numbersRepeating decimal numbersThis categorization is made on the basis of result obtained upon dividing p by q.The thumb for this categorization is that −We will obtain a terminating decimal number if and only if ... Read More

We are required to write a JavaScript function that takes in a number, finds the sum of its digits and returns a prime number that is just greater than or equal to the sum.ExampleFollowing is the code −const num = 56563; const digitSum = (num, sum = 0) => {    if(num){       return digitSum(Math.floor(num / 10), sum + (num % 10));    }    return sum; }; const isPrime = n => {    if (n===1){       return false;    }else if(n === 2){       return true;    }else{       for(let ... Read More

We are required to create an array out of a JavaScript object, containing the values of all of the object's properties. For example, given this object −{    "firstName": "John",    "lastName": "Smith",    "isAlive": "true",    "age": "25" } We have to produce this array −const myarray = ['John', 'Smith', 'true', '25'];ExampleFollowing is the code −Solution1const obj = {    "firstName": "John",    "lastName": "Smith",    "isAlive": "true",    "age": "25" }; const objectToArray = obj => {    const keys = Object.keys(obj);    const res = [];    for(let i = 0; i < keys.length; i++){       ... Read More

Suppose, we have an array of objects where the user names are mapped to some unique ids like this −const arr = [    {"4": "Rahul"},    {"7": "Vikram"},    {"6": "Rahul"},    {"3": "Aakash"},    {"5": "Vikram"} ];As apparent in the array, same names can have more than one ids but same ids can be used to map two different names.We are required to write a JavaScript function that takes in one such array as the first argument and a name string as the second argument. The function should return an array of all ids that were used to ... Read More

We are required to write a JavaScript function that takes in an array of strings and returns the index of string that is shortest in length.We will simply use a for loop and persist the index of string which is shortest in length.ExampleFollowing is the code −const arr = ['this', 'can', 'be', 'some', 'random', 'sentence']; const findSmallest = arr => {    const creds = arr.reduce((acc, val, index) => {       let { ind, len } = acc;       if(val.length < len){          len = val.length;          ind = index; ... Read More

We are required to write a JavaScript function that takes in an array of Numbers and sums all the identical numbers together at one indexFor example −If the input array is −const arr = [20, 10, 15, 20, 15, 10];Then the output should be −const output = [40, 20, 30];ExampleFollowing is the code −const arr = [20, 10, 15, 20, 15, 10]; const addSimilar = arr => {    for(let i = 0; i < arr.length; i++){       while(i !== arr.lastIndexOf(arr[i])){          const ind = arr.lastIndexOf(arr[i]);          arr[i] += arr.splice(ind, 1)[0];       };    }; }; addSimilar(arr); console.log(arr);OutputThis will produce the following output in console −[ 40, 20, 30 ]

We are required to write a JavaScript function that takes in two arrays and merges the arrays taking elements alternatively from the arrays.For example −If the two arrays are −const arr1 = [4, 3, 2, 5, 6, 8, 9]; const arr2 = [2, 1, 6, 8, 9, 4, 3];Then the output should be −const output = [4, 2, 3, 1, 2, 6, 5, 8, 6, 9, 8, 4, 9, 3];ExampleFollowing is the code −const arr1 = [4, 3, 2, 5, 6, 8, 9]; const arr2 = [2, 1, 6, 8, 9, 4, 3]; const mergeAlernatively = (arr1, arr2) => {    const res = [];    for(let i = 0; i < arr1.length + arr2.length; i++){       if(i % 2 === 0){          res.push(arr1[i/2]);       }else{          res.push(arr2[(i-1)/2]);       };    };    return res; }; console.log(mergeAlernatively(arr1, arr2));OutputThis will produce the following output in console −[    4, 2, 3, 1, 2, 6,    5, 8, 6, 9, 8, 4,    9, 3 ]

Suppose, we have a comma separator string that contains some fruit names like this −const str = 'Banana, Banana, Pear, Orange, Apple, Melon, Grape, Apple, Banana, Grape, Melon, Grape, Melon, Apple, Grape, Banana, Orange, Melon, Orange, Banana, Banana, Orange, Pear, Grape, Orange, Orange, Apple, Apple, Banana';We are required to write a JavaScript function that takes in one such string and uses the for in loop to figure out the fruit name that appears for the greatest number of times in the string.The function should return the fruit string that appears for most number of times.ExampleFollowing is the code −const str ... Read More