ProblemWe are required to write a JavaScript function that takes in an array of numbers and a single number as two arguments.Our function should filter the array to contain only those numbers that are divisible by the number provided as second argument and return the filtered array.ExampleFollowing is the code − Live Democonst arr = [56, 33, 2, 4, 9, 78, 12, 18]; const num = 3; const divisibleBy = (arr = [], num = 1) => {    const canDivide = (a, b) => a % b === 0;    const res = arr.filter(el => {       return canDivide(el, num);    });    return res; }; console.log(divisibleBy(arr, num));Output[ 33, 9, 78, 12, 18 ]

ProblemWe are required to write a JavaScript function that takes in an array of integers (negatives and positives).Our function should convert all positives to negatives and all negatives to positives and return the resulting array.ExampleFollowing is the code − Live Democonst arr = [5, 67, -4, 3, -45, -23, 67, 0]; const invertSigns = (arr = []) => {    const res = [];    for(let i = 0; i < arr.length; i++){       const el = arr[i];       if(+el && el !== 0){          const inverted = el * -1;          res.push(inverted);       }else{          res.push(el);       };    };    return res; }; console.log(invertSigns(arr));Output[ -5, -67, 4, -3, 45, 23, -67, 0 ]

ProblemWe are required to write a JavaScript function that takes in a number that specifies speed in kmph and it should return the equivalent speed in cm/s.ExampleFollowing is the code − Live Democonst kmph = 12; const convertSpeed = (kmph) => {    const secsInHour = 3600;    const centimetersInKilometers = 100000;    const speed = Math.floor((kmph * centimetersInKilometers) / secsInHour);    return `Equivalent in cmps is: ${speed}`; }; console.log(convertSpeed(kmph));OutputEquivalent in cmps is: 333

ProblemWe are required to write a JavaScript function that takes in a binary array (consisting of only 0 and 1).Our function should first join all the bits in the array and then return the decimal number corresponding to that binary.ExampleFollowing is the code − Live Democonst arr = [1, 0, 1, 1]; const binaryArrayToNumber = arr => {    let num = 0;    for (let i = 0, exponent = 3; i < arr.length; i++) {       if (arr[i]) {          num += Math.pow(2, exponent);       };       exponent--;    };    return num; }; console.log(binaryArrayToNumber(arr));Output11

ProblemWe are required to write a JavaScript function that takes in two objects both having x and y property specifying two points in a plane.Our function should find and return the distance between those two points.ExampleFollowing is the code − Live Democonst a = {x: 5, y: -4}; const b = {x: 8, y: 12}; const distanceBetweenPoints = (a = {}, b = {}) => {    let distance = 0;    let x1 = a.x,    x2 = b.x,    y1 = a.y,    y2 = b.y;    distance = Math.sqrt((x2 - x1) * 2 + (y2 - y1) * 2);    return distance; }; console.log(distanceBetweenPoints(a, b));Output6.164414002968976

ProblemWe are required to write a JavaScript function that takes in a date object. And based on that object our function should return the astrological sign related to that birthdate.ExampleFollowing is the code − Live Democonst date = new Date(); // as on 2 April 2021 const findSign = (date) => {    const days = [21, 20, 21, 21, 22, 22, 23, 24, 24, 24, 23, 22];    const signs = ["Aquarius", "Pisces", "Aries", "Taurus", "Gemini", "Cancer", "Leo",    "Virgo", "Libra", "Scorpio", "Sagittarius", "Capricorn"];    let month = date.getMonth();    let day = date.getDate();    if(month == 0 && day

ProblemWe are required to write a JavaScript function that takes in three parameters −cap − is the amount of people the bus can hold excluding the driver.on − is the number of people on the bus excluding the driver.wait − is the number of people waiting to get on to the bus excluding the driver.If there is enough space, we should return 0, and if there isn't, we should return the number of passengers we can't take.ExampleFollowing is the code − Live Democonst cap = 120; const on = 80; const wait = 65; const findCapacity = (cap, on, wait) => ... Read More

DNA And RNA RelationDeoxyribonucleic acid, DNA is the primary information storage molecule in biological systems. It is composed of four nucleic acid bases Guanine ('G'), Cytosine ('C'), Adenine ('A'), and Thymine ('T').Ribonucleic acid, RNA, is the primary messenger molecule in cells. RNA differs slightly from DNA its chemical structure and contains no Thymine. In RNA Thymine is replaced by another nucleic acid Uracil ('U').ProblemWe are required to write a JavaScript function which translates a given DNA string into RNA.ExampleFollowing is the code − Live Democonst DNA = 'GCAT'; const DNAtoRNA = (DNA) => {    let res = '';    for(let ... Read More

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