Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Web Development Articles
Page 42 of 801
Summing numbers present in a string separated by spaces using JavaScript
ProblemWe are required to write a JavaScript function that takes in a string which has integers inside it separated by spaces.The task of our function is to convert each integer in the string into an integer and return their sum.ExampleFollowing is the code −const str = '1 5 12 76 2'; const sumStringNumbers = (str = '') => { const findSum = (arr = []) => { const sum = arr.reduce((acc, val) => acc + val); return sum; }; let sum = 0; const arr = str .split(' ') .map(Number); sum = findSum(arr); return sum; }; console.log(sumStringNumbers(str));Output96
Read MoreCalculating value of a sequence based on some input using JavaScript
ProblemWe are required to write a JavaScript function that takes in a number n as the only input. Suppose a sequence u for which,u1 = 0 and u1 = 2Our function should find the of un for which,6unun+1- 5unun+2+un+1un+2 = 0ExampleFollowing is the code −const num = 13; const sequenceSum = (num = 1) => { const res = Math.pow(2, num); return res; }; console.log(sequenceSum(num));Output8192
Read MoreAll ways to divide array of strings into parts in JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of literals of at least two elements.Our function should return all the ways to divide the array into two non-empty parts.For instance −For the array ["az", "toto", "picaro", "zone", "kiwi"]The possibilities are −"(az, toto picaro zone kiwi)(az toto, picaro zone kiwi)(az toto picaro, zone kiwi)(az toto picaro zone, kiwi)"ExampleFollowing is the code −const arr = ["az", "toto", "picaro", "zone", "kiwi"]; const findAllPossiblities = (arr = []) => { let array; const res = []; for(let i = 1; i < arr.length; i++){ ...
Read MoreCount of pairs in an array that have consecutive numbers using JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of integers. Our function should return the count of such contagious pairs from the array that have consecutive numbers in them.ExampleFollowing is the code −const arr = [1, 2, 5, 8, -4, -3, 7, 6, 5]; const countPairs = (arr = []) => { let count = 0; for (var i=0; i
Read MoreFinding the longest consecutive appearance of a character in another string using JavaScript
ProblemWe are required to write a JavaScript function that takes in a string as the first argument and a single character as the second argument.Our function should count and return the longest consecutive appearance of the the character in the string.ExampleFollowing is the code −const str = 'abcdaaadse'; const char = 'a'; const countChars = (str = '', char = '') => { const arr = str.split(''); let c = 0, max = 0; for (let i = 0; i max){ max = c; }; }else{ if(c > max){ max = c; }; c = 0; }; }; return max; }; console.log(countChars(str, char));Output3
Read MoreFinding the count of total upside down numbers in a range using JavaScript
Upside Down NumbersThe numbers that remain the same when they’re rotated by 180 degrees are called upside down numbers.For instance, 9116, 69.ProblemWe are required to write a JavaScript function that takes in a range array of two numbers. Our function should return the count of all the upside down numbers that fall in the specified range.ExampleFollowing is the code −const range = [5, 125]; const flipNum = (number) => { const upsideDownDigits = [0, 1, -99, -99, -99, -99, 9, -99, 8, 6]; let reverseNumArr = String(number) .split('') .map(val => Number(val)) ...
Read MoreApplying a custom function to each corresponding element of two arrays using JavaScript
ProblemWe are required to write a JavaScript function that takes in a callback function (which takes in two arguments and returns a value) as the first argument and two arrays of essentially the same length as the second and third argument.Our function should construct and return a new array whose each corresponding element is the return value of the callback function if corresponding numbers of the input array are provided to it.ExampleFollowing is the code −const arr1 = [1, 2, 3, 4]; const arr2 = [5, 6, 7, 8]; const add = (a, b) => a + b; const applyFunction ...
Read MoreFinding alphabet from ASCII value without using library functions in JavaScript
ProblemWe are required to write a JavaScript function that takes in a number. Our function should return the corresponding ASCII alphabet for that number (if there exists an alphabet for that ASCII value), -1 otherwise.The condition here is that we cannot use any inbuilt function that converts these values.ExampleFollowing is the code −const num = 98; const findChar = (num = 1) => { const alpha = 'abcdefghijklmnopqrstuvwxyz'; if(num >= 97 && num = 65 && num
Read MoreFinding the length of longest vowel substring in a string using JavaScript
ProblemWe are required to write a JavaScript function that takes in a string. Our function should return the length of the longest contiguous substring that contains only vowels.ExampleFollowing is the code −const str = 'schooeal'; const findLongestVowel = (str = '') => { let cur = 0 let max = 0 for (let i = 0; i < str.length; ++i) { if ("aeiou".includes(str[i])) { cur++ if (cur > max) { max = cur } } else { cur = 0 } } return max }; console.log(findLongestVowel(str));Output4
Read MoreSwapping adjacent binary bits of a decimal to yield another decimal using JavaScript
ProblemWe are required to write a JavaScript function that takes in a number.Our function should iterate through the binary equivalent of the number and swap its adjacent bits to construct a new binary. And then finally our function should return the decimal equivalent of the new binary.ExampleFollowing is the code −const num = 13; const swapBits = (num) => { let arr = num.toString(2).split(''); if(arr.length % 2){ arr.unshift(0); } for(let i = 0; i < arr.length - 1; i = i + 2) { [arr[i], arr[i + 1]] = [arr[i + 1], arr[i]]; } return +('0b' + arr.join('')); } console.log(swapBits(num));Output14
Read More