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Articles by AmitDiwan
Page 308 of 840
Changing the case of a string using JavaScript
We are required to write a JavaScript function that takes in a string and converts it to snake case. Snake case is basically a style of writing strings by replacing the spaces with '_' and converting the first letter of each word to lowercase. Example The code for this will be − const str = 'This is a simple sentence'; const toSnakeCase = (str = '') => { const strArr = str.split(' '); const snakeArr = strArr.reduce((acc, val) => { ...
Read MoreMatching odd even indices with values in JavaScript
We are required to write a JavaScript function that takes in an array of numbers. The array given as an input to the function have two special properties − The length of the array will always be an even number. The number of even numbers and the number of odd numbers in the array will always be equal (i.e., both being equal to the half of the length of array) The function should shuffle the elements of the array such that all the even values occupy even indices ...
Read MoreVowel gaps array in JavaScript
We are required to write a JavaScript function that takes in a string with at least one vowel, and for each character in the string we have to map a number representing its nearest distance from a vowel. For example: If the string is − const str = 'vatghvf'; Output Then the output should be − const output = [1, 0, 1, 2, 3, 4, 5]; The logic is: 'v' is 1 position away from vowel 'a', 'a' is 0 (it's a vowel), 't' is 1 away from 'a', 'g' ...
Read MoreRemoving smallest subarray to make array sum divisible in JavaScript
We are required to write a JavaScript function that takes in an array of positive integers as the first argument and a positive integer as the second argument. The function should figure out and return the length of the smallest subarray that we should delete from the original array in order to make its sum divisible by the number specified by the second argument. For example, if we have an array [3, 8, 2, 6] and want the sum divisible by 9, we need to remove the subarray [8, 2] of length 2. Problem Analysis The ...
Read MoreColumn sum of elements of 2-D arrays in JavaScript
We have an array of arrays and are required to write a function that takes in this array and returns a new array that represents the sum of corresponding elements of original array. If the original array is: [ [43, 2, 21], [1, 2, 4, 54], [5, 84, 2], [11, 5, 3, 1] ] Then the output should be: [60, 93, 30, 55] This means we add all elements at index 0 (43+1+5+11=60), all elements at index 1 (2+2+84+5=93), ...
Read MoreSwapping letter with succeeding alphabet in JavaScript
We are required to write a JavaScript function that takes in a string and changes every letter of the string from the English alphabets to its succeeding element. For example: If the string is − const str = 'how are you'; Output Then the output should be − const output = 'ipx bsf zpv' Therefore, let's write the code for this function − How It Works The algorithm converts each alphabetic character to its next letter in the alphabet. For 'z' and 'Z', it wraps around to 'a' ...
Read MoreMerge two sorted arrays to form a resultant sorted array in JavaScript
We are required to write a JavaScript function that takes in two sorted arrays of numbers. The function should merge the two arrays together to form a resultant sorted array and return that array. For example, if the two arrays are: const arr1 = [2, 6, 6, 8, 9]; const arr2 = [1, 4, 5, 7]; Then the output array should be: [1, 2, 4, 5, 6, 6, 7, 8, 9] Method 1: Using Two Pointers Technique The most efficient approach is the two-pointers technique, which compares elements from both ...
Read MoreFinding all solutions of a Diophantine equation using JavaScript
Problem We need to write a JavaScript function that takes a number n and finds all integer solutions (x, y) for the Diophantine equation: x^2 - 4y^2 = n The function should return an array of all such pairs [x, y]. Mathematical Approach To solve x² - 4y² = n, we can factorize it as: x^2 - 4y^2 = (x + 2y)(x - 2y) = n Let a = x - 2y and b = x + 2y, then: a × b = n x = (a + ...
Read MoreThe n times dribbling strings in JavaScript
We are required to write a JavaScript function that takes in a string and a number, say n, and the function should return a new string in which all the letters of the original string are repeated n times. For example: If the string is − const str = 'how are you' And the number n is 2. Output Then the output should be − const output = 'hhooww aarree yyoouu' Therefore, let's write the code for this function − Using String.prototype.repeat() The most straightforward approach is to iterate through each ...
Read MoreHow to merge two arrays with objects in one in JavaScript?
Suppose, we have two arrays of objects like these − const arr1 = [ {name:'test', lastname: 'test', gender:'f'}, {name:'test1', lastname: 'test1', gender:'f'}, {name:'test2', lastname: 'test2', gender:'m'} ]; const arr2 = [ {name:'test21', lastname: 'test21', gender:'f'}, {name:'test1', lastname: 'test1', gender:'f'}, {name:'test2', lastname: 'test2', gender:'m'}, {name:'test22', lastname: 'test22', gender:'m'} ]; console.log("Array 1:", arr1); console.log("Array 2:", arr2); Array 1: [ { name: 'test', lastname: 'test', gender: 'f' }, { name: 'test1', lastname: 'test1', gender: 'f' }, { ...
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