Javascript Articles - Page 180 of 607

ProblemThe car registering system of a city N assigns two types of numbers −The Customer ID − a natural number between 0 and 17558423 inclusively, which is assigned to the car buyers in the following order: the first customer receives ID 0, the second customer receives ID 1, the third customer receives ID 2, and so on;Number Plate − assigned to the car and contains the series ( three Latin lowercase letters from a to z) and the serial number (three digits from 0 to 9).Example − aaa001. Each Number Plate is related to the given Customer ID. For example: ... Read More

ProblemWe are required to write a JavaScript function that takes in a string and converts it into NATO phonetic alphabet.The 26 code words are as follows: Alfa, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu.ExampleFollowing is the code − Live Democonst str = 'this is simple string'; const convertToNato = (str = '') => {    let nato = {       a: 'Alfa',       b: 'Bravo',       c: 'Charlie',       d: 'Delta',       e: ... Read More

ProblemWe are required to write a JavaScript function that takes in a number in miles/gallon and return its equivalent km/litre.ExampleFollowing is the code − Live Democonst num = 25; const converter = (mpg) => {    let LITRES_PER_GALLON = 4.54609188;    let KILOMETERS_PER_MILE = 1.609344;    const ratio = KILOMETERS_PER_MILE / LITRES_PER_GALLON;    return Math.round(100 * mpg * ratio) / 100; }; console.log(converter(num));OutputFollowing is the console output −8.85

Triangular NumberTriangular number is the number of points that can fill an equilateral triangle.For instance − 9 is a triangular number which makes an equilateral triangle with each side of 4 units.ProblemWe are required to write a JavaScript function that takes in a number and returns true if its a triangular number, false otherwise.ExampleFollowing is the code − Live Democonst num = 9; const isTriangular = (num = 1) => {    let i = 4;    if(num === 1){       return true;    };    if(num === 3){       return true;    };    while(((3 * 1) - 3)

ProblemWe are required to write a JavaScript function that takes in the 1-based month index and return the quarter, which the month falls in.ExampleFollowing is the code − Live Democonst month = 7; const findQuarter = (month = 1) => {    if (month

ProblemWe are required to write a JavaScript function that takes in a number n and converts it to the corresponding string without using the inbuilt functions String() or toString() or using string concatenation.ExampleFollowing is the code − Live Democonst num = 235456; const convertToString = (num) => {    let res = '';    while(num){       res = (num % 10) + res;       num = Math.floor(num / 10);    };    return res; }; console.log(convertToString(num));OutputFollowing is the console output −235456

Doubleton NumberWe will call a natural number a "doubleton number" if it contains exactly two distinct digits. For example, 23, 35, 100, 12121 are doubleton numbers, and 123 and 9980 are not.ProblemWe are required to write a JavaScript function that takes in a number and return true if it is a doubleton number, false otherwise.ExampleFollowing is the code − Live Democonst num = 121212; const isDoubleTon = (num = 1) => {    const str = String(num);    const map = {};    for(let i = 0; i < str.length; i++){       const el = str[i];       ... Read More

ProblemWe are required to write a JavaScript function that takes in a string. Our function should convert every character of the string to the hex value of its ascii code, then the result should be the sum of the numbers in the hex strings ignoring the letters present in hex.ExampleFollowing is the code − Live Democonst str = "Hello, World!"; const toHexAndSum = (str = '') => {    return str    .split('')    .map(c=>c.charCodeAt())    .map(n=>n.toString(16))    .join('')    .split('')    .filter(c=>'123456789'.includes(c))    .map(d=>parseInt(d))    .reduce((a, b)=>a+b, 0) }; console.log(toHexAndSum(str));OutputFollowing is the console output −91Read More

Lucas NumbersLucas numbers are numbers in a sequence defined like this −L(0) = 2 L(1) = 1 L(n) = L(n-1) + L(n-2)ProblemWe are required to write a JavaScript function that takes in a number n and return the nth lucas number.ExampleFollowing is the code − Live Democonst num = 21; const lucas = (num = 1) => {    if (num === 0)       return 2;    if (num === 1)       return 1;    return lucas(num - 1) +       lucas(num - 2); }; console.log(lucas(num));OutputFollowing is the console output −24476

ProblemWe are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.Our function should check whether the input array is a centrally peaked array or not. If it is a centrally peaked array, we should return true, false otherwise.The conditions for being a centrally peaked array are −arr.length >= 3There exists some i with 0 < i < arr.length - 1 such that:arr[0] < arr[1] < ... arr[i-1] < arr[i]arr[i] > arr[i+1] > ... > arr[arr.length - 1]For example, if the input to the function is −const arr = ... Read More