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Javascript Articles
Page 24 of 534
Difference between numbers and string numbers present in an array in JavaScript
ProblemWe are required to write a JavaScript function that takes in a mixed array of number and string representations of integers.Our function should add up okthe string integers and subtract this from the total of the non-string integers.ExampleFollowing is the code −const arr = [5, 2, '4', '7', '4', 2, 7, 9]; const integerDifference = (arr = []) => { let res = 0; for(let i = 0; i < arr.length; i++){ const el = arr[i]; if(typeof el === 'number'){ res += el; }else if(typeof el === 'string' && +el){ res -= (+el); }; }; return res; }; console.log(integerDifference(arr));OutputFollowing is the console output −10
Read MoreReplacing vowels with their 1-based index in a string in JavaScript
ProblemWe are required to write a JavaScript function that takes in a string and replaces all occurrences of the vowels in the string with their index in the string (1-based).It means if the second letter of the string is a vowel, it should be replaced by 2.ExampleFollowing is the code −const str = 'cancotainsomevowels'; const replaceVowels = (str = '') => { const vowels = 'aeiou'; let res = ''; for(let i = 0; i < str.length; i++){ const el = str[i]; if(vowels.includes(el)){ res += (i ...
Read MoreRetrieving n smallest numbers from an array in their original order in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of numbers arr, and a number n.Our function should retrieve the n smallest from the array arr without disturbing their relative order. It means they should not be arranged in increasing or decreasing order rather they should hold their original order.ExampleFollowing is the code −const arr = [6, 3, 4, 1, 2]; const num = 3; const smallestInOrder = (arr = [], num) => { if(arr.length < num){ return arr; }; const copy = arr.slice(); copy.sort((a, b) => a - ...
Read MoreSum array of rational numbers and returning the result in simplest form in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of exactly two subarrays with two numbers each.Both the subarrays represent a rational number in fractional form. Our function should add the rational numbers and return a new array of two numbers representing the simplest form of the added rational number.ExampleFollowing is the code −const arr = [ [1, 2], [1, 3] ]; const findSum = (arr = []) => { const hcf = (a, b) => b ? hcf(b, a % b) : a; if(!arr.length){ return null; }; ...
Read MoreDecrypting source message from a code based on some algorithm in JavaScript
ProblemWe are required to write a JavaScript function that takes in a decrypted message and returns its source message.All we know is the algorithm used to encrypt that message.And the algorithm is −Reverse the message string.Replace every letter with its ASCII code in quotes (A to '65', h to '104' and so on).Insert digits and spaces as is.ExampleFollowing is the code −const str = '12 hello world 30'; const decryptString = (str = '') => { const alpha = 'abcdefghijklmnopqrstuvwxyz'; let res = ''; for(let i = str.length - 1; i >= 0; i--){ ...
Read MoreFinding the sum of floors covered by an elevator in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array that represents the floor numbers at which a building lift stopped during an interval of time.From that data, our function should return the count of total number of floors covered by the lift in that time.ExampleFollowing is the code −const arr = [7, 1, 7, 1]; const floorsCovered = (arr = []) => { let res = 0; for (let i = 0; i < arr.length; i++){ if (arr[i] > arr[i+1]){ res += arr[i] - arr[i+1]; ...
Read MoreFinding a number, when multiplied with input number yields input number in JavaScript
ProblemWe are required to write a JavaScript function that takes in a positive integer n written as abcd... (a, b, c, d... being digits) and a positive integer pwe want to find a positive integer k, if it exists, such as the sum of the digits of n taken to the successive powers of p is equal to k * n.In other words −Is there an integer k such as : (a ^ p + b ^ (p+1) + c ^(p+2) + d ^ (p+3) + ...) = n * kIf it is the case, we will return k, if ...
Read MoreCounting number of 9s encountered while counting up to n in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number n. Our function should count and return the number of times we will have to use 9 while counting from 0 to n.ExampleFollowing is the code −const num = 100; const countNine = (num = 0) => { const countChar = (str = '', char = '') => { return str .split('') .reduce((acc, val) => { if(val === char){ acc++; }; return acc; }, 0); }; let count = 0; for(let i = 0; i
Read MoreAdding and searching for words in custom Data Structure in JavaScript
ProblemWe are required to design a data structure in JavaScript that supports the following two operations −addWord, which adds a word to that Data Structure (DS), we can take help of existing DS like arrays or any other DS to store this data, search, which searches a literal word or a regular expression string containing lowercase letters "a-z" or "." where "." can represent any letterFor exampleaddWord("sir") addWord("car") addWord("mad") search("hell") === false search(".ad") === true search("s..") === trueExampleFollowing is the code −class MyData{ constructor(){ this.arr = []; }; }; MyData.prototype.addWord = function (word) { ...
Read MoreLongest possible string built from two strings in JavaScript
ProblemWe are required to write a JavaScript function that takes in two strings s1 and s2 including only letters from ato z.Our function should return a new sorted string, the longest possible, containing distinct letters - each taken only once - coming from s1 or s2.ExampleFollowing is the code −const str1 = "xyaabbbccccdefww"; const str2 = "xxxxyyyyabklmopq"; const longestPossible = (str1 = '', str2 = '') => { const combined = str1.concat(str2); const lower = combined.toLowerCase(); const split =lower.split(''); const sorted = split.sort(); const res = []; for(const el of sorted){ ...
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