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Javascript Articles
Page 16 of 534
Returning number with increasing digits. in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number n. Our function should return it with its digits in descending order. Essentially, we should rearrange the digits to create the highest possible number.ExampleFollowing is the code −const num = 5423267; const arrangeInDescending = (num = 1) => { const str = String(num); const arr = str.split(''); arr.sort((a, b) => { return +b - +a; }); const newStr = arr.join(''); const res = Number(newStr); return res; }; console.log(arrangeInDescending(num));OutputFollowing is the console output −7654322
Read MoreCreating all possible unique permutations of a string in JavaScript
ProblemWe are required to write a JavaScript function that takes in a string str. Our function should create all permutations of the input string and remove duplicates, if present. This means, we have to shuffle all letters from the input in all possible orders.ExampleFollowing is the code −const str = 'aabb'; const permute = (str = '') => { if (!!str.length && str.length < 2 ){ return str } const arr = []; for (let i = 0; i < str.length; i++){ let char = str[i] if ...
Read MoreReplacing dots with dashes in a string using JavaScript
ProblemWe are required to write a JavaScript function that takes in a string and replaces all appearances of dots(.) in it with dashes(-).inputconst str = 'this.is.an.example.string';Outputconst output = 'this-is-an-example-string';All appearances of dots(.) in string str are replaced with dash(-)ExampleFollowing is the code −const str = 'this.is.an.example.string'; const replaceDots = (str = '') => { let res = ""; const { length: len } = str; for (let i = 0; i < len; i++) { const el = str[i]; if(el === '.'){ res += '-'; ...
Read MoreDeep count of elements of an array using JavaScript
ProblemWe are required to write a JavaScript function that takes in a nested array of element and return the deep count of elements present in the array.Inputconst arr = [1, 2, [3, 4, [5]]];Outputconst output = 7;Because the elements at level 1 are 2, elements at level 2 are 2 and elements at level 3 are 1, Hence the deep count is 7.ExampleFollowing is the code −const arr = [1, 2, [3, 4, [5]]]; const deepCount = (arr = []) => { return arr .reduce((acc, val) => { return acc + (Array.isArray(val) ? deepCount(val) : ...
Read MoreConverting humanYears into catYears and dogYears in JavaScript
ProblemWe are required to write a JavaScript function that takes in human age in years and returns respective dogYears and catYears.Inputconst humanYears = 15;Outputconst output = [ 15, 76, 89 ];ExampleFollowing is the code −const humanYears = 15; const humanYearsCatYearsDogYears = (humanYears) => { let catYears = 0; let dogYears = 0; for (let i = 1; i
Read MoreValidating string with reference to array of words using JavaScript
ProblemWe are required to write a JavaScript function that takes in a sequence of valid words and a string. Our function should test if the string is made up by one or more words from the array.Inputconst arr = ['love', 'coding', 'i']; const str = 'ilovecoding';Outputconst output = true;Because the string can be formed by the words in the array arr.ExampleFollowing is the code −const arr = ['love', 'coding', 'i']; const str = 'ilovecoding'; const validString = (arr = [], str) => { let arrStr = arr.join(''); arrStr = arrStr .split('') .sort() .join(''); str ...
Read MoreHours and minutes from number of seconds using JavaScript
ProblemWe are required to write a JavaScript function that takes in the number of second and return the number of hours and number of minutes contained in those seconds.Inputconst seconds = 3601;Outputconst output = "1 hour(s) and 0 minute(s)";ExampleFollowing is the code −const seconds = 3601; const toTime = (seconds = 60) => { const hR = 3600; const mR = 60; let h = parseInt(seconds / hR); let m = parseInt((seconds - (h * 3600)) / mR); let res = ''; res += (`${h} hour(s) and ${m} minute(s)`) return res; }; console.log(toTime(seconds));Output"1 hour(s) and 0 minute(s)"
Read MoreCounting divisors of a number using JavaScript
ProblemWe are required to write a JavaScript function that takes in a number and returns the count of its divisor.Inputconst num = 30;Outputconst output = 8;Because the divisors are −1, 2, 3, 5, 6, 10, 15, 30ExampleFollowing is the code −const num = 30; const countDivisors = (num = 1) => { if (num === 1) return num let divArr = [[2, 0]] let div = divArr[0][0] while (num > 1) { if (num % div === 0) { for (let i = 0; divArr.length; i++) { if (divArr[i][0] === div) { divArr[i][1] += 1 break } else { if (i === divArr.length - 1) { divArr.push([div, 1]) break } } } num /= div } else { div += 1 } } for (let i = 0; i < divArr.length; i++) { num *= divArr[i][1] + 1 } return num } console.log(countDivisors(num));Output8
Read MoreNumbers obtained during checking divisibility by 7 using JavaScript
ProblemWe can check for a number to be divisible by 7 if it is of the form 10a + b and a - 2b is divisible by 7.We continue to do this until a number known to be divisible by 7 is obtained; we can stop when this number has at most 2 digits because we are supposed to know if a number of at most 2 digits is divisible by 7 or not.We are required to write a JavaScript function that takes in a number and return the number of such steps required to reduce the number to a ...
Read MoreSeparating data type from array into groups in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of mixed data types. Our function should return an object that contains data type names as key and their value as array of elements of that specific data type present in the array.ExampleFollowing is the code −const arr = [1, 'a', [], '4', 5, 34, true, undefined, null]; const groupDataTypes = (arr = []) => { const res = {}; for(let i = 0; i < arr.length; i++){ const el = arr[i]; const type = typeof el; ...
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