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
Javascript Articles
Page 234 of 534
Removing consecutive duplicates from strings in an array using JavaScript
ProblemWe are required to write a JavaScript function that takes in an array of strings. Our function should remove the duplicate characters that appear consecutively in the strings and return the new modified array of strings.ExampleFollowing is the code − Live Democonst arr = ["kelless", "keenness"]; const removeConsecutiveDuplicates = (arr = []) => { const map = []; const res = []; arr.map(el => { el.split('').reduce((acc, value, index, arr) => { if (arr[index] !== arr[index+1]) { map.push(arr[index]); } if (index === arr.length-1) { res.push(map.join('')); map.length = 0 } }, 0); }); return res; } console.log(removeConsecutiveDuplicates(arr));Output[ 'keles', 'kenes' ]
Read MoreReversing a string while maintaining the position of spaces in JavaScript
ProblemWe are required to write a JavaScript function that takes in a string that might contain some spaces.Our function should reverse the words present in the string internally without interchange the characters of two separate words or the spaces.ExampleFollowing is the code − Live Democonst str = 'this is normal string'; const reverseWordsWithin = (str = '') => { let res = ""; for (let i = str.length - 1; i >= 0; i--){ if(str[i] != " "){ res += str[i]; }; if(str[res.length] == " "){ res += str[res.length]; }; }; return res; }; console.log(reverseWordsWithin(str));Outputgnir ts lamron sisiht
Read MoreCounting prime numbers that reduce to 1 within a range using JavaScript
ProblemWe are required to write a JavaScript function that takes in a range array of two numbers. Our function should return the count of such prime numbers whose squared sum of digits eventually yields 1.For instance, 23 is a prime number and,22 + 32 = 13 12 + 32 = 10 12 + 02 = 1Hence, 23 should be a valid number.ExampleFollowing is the code − Live Democonst range = [2, 212]; String.prototype.reduce = Array.prototype.reduce; const isPrime = (n) => { if ( n acc+v*v, 0 ))); return n===1; } const countDesiredPrimes = ([a, b]) => { let res=0; for ( ; a
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 − Live Democonst 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 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 − Live Democonst 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 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 − Live Democonst num = 98; const findChar = (num = 1) => { const alpha = 'abcdefghijklmnopqrstuvwxyz'; if(num >= 97 && num = 65 && num
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 − Live Democonst arr1 = [1, 2, 3, 4]; const arr2 = [5, 6, 7, 8]; const add = (a, b) => a + b; const ...
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 − Live Democonst 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 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 − Live Democonst 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 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 − Live Democonst arr = [1, 2, 5, 8, -4, -3, 7, 6, 5]; const countPairs = (arr = []) => { let count = 0; for (var i=0; i
Read More