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Front End Technology Articles
Page 373 of 652
Subarray pairs with equal sums in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the only argument.The function should determine whether there exists any way in which we can split the array into two subarray such that the sum of the elements present in the two subarrays are equal. While dividing the elements into subarrays we have to make sure that no element from the original array is left.For example −If the input array is −const arr = [5, 3, 7, 4, 1, 8, 2, 6];Then the output should be −const output = true;because the desired subarrays are: ...
Read MoreMaximum Product of Two Numbers in a List of Integers in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the first and the only argument.The function should find the maximum product that can be achieved multiplying any two elements of the array. The condition for us is that we have to do this in linear time and constant space.For example −If the input array is −const arr = [3, 9, 2, 1, 0];Then the output should be −const output = 27;because it’s the greatest product and can be achieved by multiplying 3 and 9.ExampleFollowing is the code −const arr = [3, 9, 2, ...
Read MoreCheck if a string is repeating in itself in JavaScript
We are required to write a JavaScript function that takes in a string as the first and the only argument.The function should detect if the string is a repetition of a same set of characters or not.If it is a repetition of the same set of characters then we should return true, false otherwise.For example −If the input string is −const str = 'carcarcarcar';Then the output should be −const output = true;because the string 'car' is getting repeated over and over again in the string.ExampleFollowing is the code −const str = 'carcarcarcar'; const isRepeating = (str = '') => { ...
Read MoreCounting the number of palindromes that can be constructed from a string in JavaScript
We are required to write a JavaScript function that takes in a string of characters as the first argument, say str, and a number, say num, as the second argument.The function should count the number of palindrome strings all exactly of length num can be constructed from the given string str. The function should then finally return the count.For example −If the input string and the number is −const str = 'ij'; const num = 4;Then the output should be −const output = 4;because those four possible palindrome strings are −'iiii', 'jjjj', 'ijji', 'jiij'Approach:We will first count the number of ...
Read MoreReturning acronym based on a string in JavaScript
We are required to write a JavaScript function that takes in a string of characters as the only argument.The function should build and return the acronym based on the string phrase provided as input.While constructing the acronym the function should take only those words into consideration that starts with an uppercase letter.For example −If the input string is −const str = 'Polar Satellite Launch Vehicle';Then the output should be −const output = 'PSLV';ExampleFollowing is the code −const str = 'Polar Satellite Launch Vehicle'; const buildAcronym = (str = '') => { const strArr = str.split(' '); let res ...
Read MoreCounting largest numbers in row and column in 2-D array in JavaScript
We are required to write a JavaScript function that takes in a two-dimensional array of integers as the only argument.The task of our function is to calculate the count of all such integers from the array that are the greatest both within their row and the column.The function should then return that count.For example −If the input array is −const arr = [ [21, 23, 22], [26, 26, 25], [21, 25, 27] ];Then the output should be −const output = 3;because those three numbers are 26, 26, 27ExampleFollowing is the code −const arr = [ [21, ...
Read MoreSubstring in infinitely extended string in JavaScript
We are required to write a JavaScript function that takes in a string of characters as the first argument and a start index and end index as second and third argument respectively. The function should find, had that string, provided as the first argument, been extended forever by appending the same string at end each time, what would have been the substring encapsulated by the start index and the end index.For example −If the input string and the indices are −const str = 'helloo'; const start = 11; const end = 15;Then the output should be −const output = 'hel';ExampleFollowing ...
Read MoreChecking if one string can be achieved from another with single tweak in JavaScript
We are required to write a JavaScript function that takes in two strings of characters lets call them str1 and str2.The function should check whether we can form str2 from str1 by deleting exactly one character from str1. If we can do so the function should return true, false otherwise.For example −If the input strings are −const str1 = 'chemistty'; const str2 = 'chemisty';Then the output should be −const output = true;ExampleFollowing is the code −const str1 = 'chemistty'; const str2 = 'chemisty'; const stringSimilarity = (str1 = '', str2 = '') => { if(str1.length - str2.length !== 1){ ...
Read MoreSwapping even and odd index pairs internally in JavaScript
We are required to write a JavaScript function that takes in an array of literals as the first and the only argument.Our function should swap each consecutive even index with each other, and swap each consecutive odd indexes with each other.The function should do these swappings in place.For example −If the input array is −const arr = [0, 1, 2, 3, 4, 5, 6, 7, 8];Then the array should become −const output = [2, 3, 0, 1, 6, 7, 4, 5, 8];because 0 and 2 gets swapped, 1 and 3 gets swapped, 4 and 6 gets swapped, 5 and 7 ...
Read MoreFind Equivalent Value and Frequency in Array in JavaScript
We are required to write a JavaScript function that takes in an array of integers as the only argument.The function should check whether there exists an integer in the array such that its frequency is same as its value.If there exists at least one such integer, we should return that integer otherwise we should return -1.For example −If the input array is −const arr = [3, 4, 3, 8, 4, 9, 7, 4, 2, 4];Then the output should be −const output = 4;ExampleFollowing is the code −const arr = [3, 4, 3, 8, 4, 9, 7, 4, 2, 4]; const ...
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