ProblemWe are required to write a JavaScript function that takes in an array of integers arr. Our function should return the string ‘odd’ if the sum of all the elements of the array is odd or ‘even’ if it’s even.ExampleFollowing is the code − Live Democonst arr = [5, 1, 8, 4, 6, 9]; const assignSum = (arr = []) => {    const sum = arr.reduce((acc, val) => {       return acc + val;    }, 0);    const isSumEven = sum % 2 === 0;    return isSumEven ? 'even' : 'odd'; }; console.log(assignSum(arr));OutputFollowing is the console output −odd

Almost Isosceles TriangleAn Almost Isosceles Integer Triangle is a triangle that all its side lengths are integers and also, two sides are almost equal, being their absolute difference 1 unit of length.ProblemWe are required to write a JavaScript function that takes in a number which specifies the perimeter of a triangle.Our function should find the measurement of such an almost isosceles triangle whose perimeter is nearest to the input perimeter.For example, if the desired perimeter is 500, Then the almost isosceles triangle with the nearest perimeter will be − [105, 104, 181]ExampleFollowing is the code − Live Democonst perimeter = 500; ... Read More

ProblemWe are required to write a JavaScript function that takes in an array of numbers.Our function should find the maximum product obtained from multiplying 2 adjacent numbers in the array.ExampleFollowing is the code − Live Democonst arr = [9, 5, 10, 2, 24, -1, -48]; function adjacentElementsProduct(array) {    let maxProduct = array[0] * array[1];    for (let i = 1; i < array.length; i++) {       product = array[i] * array[i + 1];       if (product > maxProduct)          maxProduct = product;    }    return maxProduct; }; console.log(adjacentElementsProduct(arr));Output50

ProblemWe are required to write a JavaScript function that takes in an array of numbers and a single number.Our function should find that very number which should be pushed to the array so that its average equals the number specified by the second argument.ExampleFollowing is the code − Live Democonst arr = [4, 20, 25, 17, 9, 11, 15]; const target = 25; function findNumber(arr, target) {    let sum = arr.reduce((a, b) => a + b, 0);    let avg = sum / arr.length;    let next = Math.ceil((target * (arr.length + 1)) - sum);    if (next

ProblemWe are required to write a JavaScript function that takes in a number n. Our function should construct and return an array of N * N order (2-D array), in which the 1s take all the spiralling positions starting from [0, 0] and all the 0s take non-spiralling positions.Therefore, for n = 5, the output will look like −[    [ 1, 1, 1, 1, 1 ],    [ 0, 0, 0, 0, 1 ],    [ 1, 1, 1, 0, 1 ],    [ 1, 0, 0, 0, 1 ],    [ 1, 1, 1, 1, 1 ] ]ExampleFollowing ... Read More

ProblemWe are required to write a JavaScript function that takes in a string str. The job of our function is to reverse it, omitting all non-alphabetic characters.ExampleFollowing is the code − Live Democonst str = 'exa13mple'; function reverseLetter(str) {    const res = str.split('')    .reverse()    .filter(val => /[a-zA-Z]/.test(val))    .join('');    return res; }; console.log(reverseLetter(str));Outputelpmaxe

ProblemConsider an increasing sequence which is defined as follows −The number seq(0) = 1 is the first one in seq.For each x in seq, then y = 2 * x + 1 and z = 3 * x + 1 must be in seq too.There are no other numbers in seq.Therefore, the first few terms of this sequence will be −[1, 3, 4, 7, 9, 10, 13, 15, 19, 21, 22, 27, ...]We are required to write a function that takes in a number n and returns the nth term of this sequence.ExampleFollowing is the code − Live Democonst num = ... Read More

ProblemWe are required to write a JavaScript function that lives on the prototype object of the string class.This function should simply change case of all the alphabets present in the string to uppercase and return the new string.ExampleFollowing is the code − Live Democonst str = 'This is a lowercase String'; String.prototype.customToUpperCase = function(){    const legend = 'abcdefghijklmnopqrstuvwxyz';    const UPPER = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';    let res = '';    for(let i = 0; i < this.length; i++){       const el = this[i];       const index = legend.indexOf(el);       if(index !== -1){       ... Read More

ProblemWe are required to write a JavaScript function that takes in a number and returns its reversed number.One thing that we should keep in mind is that numbers should preserve their sign; i.e., a negative number should still be negative when reversed.ExampleFollowing is the code − Live Democonst num = -224; function reverseNumber(n) {    let x = Math.abs(n)    let y = 0    while (x > 0) {       y = y * 10 + (x % 10)       x = Math.floor(x / 10)    };    return Math.sign(n) * y }; console.log(reverseNumber(num));Output-422

ProblemWe are required to write a JavaScript function that takes in an array of Boolean values and a logical operator.Our function should return a Boolean result based on sequentially applying the operator to the values in the array.ExampleFollowing is the code − Live Democonst array = [true, true, false]; const op = 'AND'; function logicalCalc(array, op){    var result = array[0];    for(var i = 1; i < array.length; i++){       if(op == "AND"){          result = result && array[i];       }       if(op == "OR"){          result = result || array[i];       }       if(op == "XOR"){          result = result != array[i];       }    }    return result; } console.log(logicalCalc(array, op));Outputfalse