Found 8894 Articles for Front End Technology

Repeating each character number of times their one based index in a string using JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:42:34

432 Views

ProblemWe are required to write a JavaScript function that takes in a string of english lowercase alphabets.Our function should construct a new string in which each character is repeated the number of times their 1-based index in the string in capital case and different character sets should be separated by dash ‘-’.Therefore, the string ‘abcd’ should become −"A-Bb-Ccc-Dddd"ExampleFollowing is the code − Live Democonst str = 'abcd'; const repeatStrings = (str) => {    const res = [];    for(let i = 0; i < str.length; i++){       const el = str[i];       let temp = el.repeat(i ... Read More

Maximum absolute difference of the length of strings from two arrays in JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:33:33

204 Views

ProblemWe are required to write a JavaScript function that takes in two arrays, a1 and a2 of strings. Each string is composed with letters from a to z. Let x be any string in the first array and y be any string in the second array.Our function should find the value of −max(abs(length(x) − length(y)))ExampleFollowing is the code − Live Democonst arr1 = ["hoqq", "bbllkw", "oox", "ejjuyyy", "plmiis", "xxxzgpsssa", "xxwwkktt", "znnnnfqknaz", "qqquuhii", "dvvvwz"]; const arr2 = ["cccooommaaqqoxii", "gggqaffhhh", "tttoowwwmmww"]; const findMaxAbsDiff = (arr1 = [], arr2 = []) => {    if(arr1.length === 0 || arr2.length === 0){       ... Read More

Representing number as the power and product of primes in JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:32:41

153 Views

ProblemWe are required to write a JavaScript function that takes in a positive integer. Our function should represent this number as the sum of some powers of prime numbers.Therefore, for the number n, our function should return a string like this −n = "(p1**n1)(p2**n2)...(pk**nk)"Where p1, p2, p3..pk are prime numbers and n1, n2, ..nk are their non-negative powers and a ** b stands for a raised to the power b.ExampleFollowing is the code −const isPrime = num => {     for(let i = 2; i < num; i++){         if(num % i === 0){     ... Read More

Frequency of elements of one array that appear in another array using JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:31:56

428 Views

ProblemWe are required to write a JavaScript function that takes in two arrays of strings. Our function should return the number of times each string of the second array appears in the first array.ExampleFollowing is the code − Live Democonst arr1 = ['abc', 'abc', 'xyz', 'cde', 'uvw']; const arr2 = ['abc', 'cde', 'uap']; const findFrequency = (arr1 = [], arr2 = []) => {    const res = [];    let count = 0;    for (let i = 0; i < arr2.length; i++){       for (let j = 0; j < arr1.length; j++){          if (arr2[i] === arr1 [j]){             count++;          }       }       res.push(count);       count = 0;    }    return res; }; console.log(findFrequency(arr1, arr2));Output[2, 1, 0]

Sorting string of words based on the number present in each word using JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:28:01

530 Views

ProblemWe are required to write a JavaScript function that takes in a string that represents a sentence. Our function should sort this sentence.Each word in the sentence string contains an integer. Our function should sort the string such that the word that contains the smallest integer is placed first and then in the increasing order.ExampleFollowing is the code − Live Democonst str = "is2 Thi1s T4est 3a"; const sortByNumber = (str = '') => {    const findNumber = (s = '') => s       .split('')       .reduce((acc, val) => +val ? +val : acc, 0);   ... Read More

Returning the value of nth power of iota(i) using JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:27:07

80 Views

ProblemWe are required to write a JavaScript function that takes in a number. Our function should return the value of −(i)nHere,i = -11/2Therefore,i^2 = -1 i^3 = -i i^4 = 1 and so onExampleFollowing is the code − Live Democonst num = 657; const findNthPower = (num = 1) => {    switch(num % 4){       case 0:          return '1';       case 1:          return 'i';       case 2:          return '-1';       case 3:          return '-i';    }; }; console.log(findNthPower(num));Outputi

Finding and returning uncommon characters between two strings in JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:26:27

980 Views

ProblemWe are required to write a JavaScript function that takes in two strings. Our function should return a new string of characters which is not common to both the strings.ExampleFollowing is the code − Live Democonst str1 = "xyab"; const str2 = "xzca"; const findUncommon = (str1 = '', str2 = '') => {    const res = [];    for (let i = 0; i < str1.length; i++){       if (!(str2.includes(str1[i]))){          res.push(str1[i])       }    }    for (let i = 0; i < str2.length; i++){       if (!(str1.includes(str2[i]))){          res.push(str2[i])       }    }    return res.join(""); }; console.log(findUncommon(str1, str2));Outputybzc

Removing consecutive duplicates from strings in an array using JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:26:02

688 Views

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' ]

Reversing a string while maintaining the position of spaces in JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:25:01

591 Views

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

Counting prime numbers that reduce to 1 within a range using JavaScript

AmitDiwan
Updated on 20-Apr-2021 09:22:43

124 Views

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

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