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Articles by AmitDiwan
Page 380 of 840
Make JavaScript take HTML input from user, parse and display?
JavaScript can retrieve HTML input values as strings and parse them into different data types. This tutorial shows how to get user input from HTML forms and convert it appropriately. Basic Input Retrieval HTML input elements return string values by default. Use document.getElementById() to access input values: Input Parser Example Parse Input function parseInput() { ...
Read MoreGo through an array and sum only numbers JavaScript
We are required to write a JavaScript function that takes in an array. The array might contain any type of value, Number literals, string literals, objects, undefined. Our function should pick all the Number type values and return their sum. Example const arr = [1, 2, 'a', 4]; const countNumbers = (arr = []) => { let sum = 0; for(let i = 0; i < arr.length; i++){ const el = arr[i]; ...
Read MorePossible combinations and convert into alphabet algorithm in JavaScript
In JavaScript, we can solve the alphabet decoding problem where each letter maps to a number (a=1, b=2, ..., z=26). Given an encoded message, we need to count how many different ways it can be decoded back into letters. For example, the message '111' can be decoded as 'aaa' (1-1-1), 'ka' (11-1), or 'ak' (1-11), giving us 3 possible combinations. Understanding the Problem The challenge is that some digit sequences can be interpreted in multiple ways: Single digits 1-9 can be decoded as letters a-i Two-digit combinations 10-26 can be decoded as letters j-z We ...
Read MoreSearching in a sorted 2-D array in JavaScript
We are required to write a JavaScript function that takes in an array of arrays of numbers as the first argument and a number as the second argument. The subarrays contain numbers sorted in an increasing order and no element of a preceding subarray is greater than any element of the succeeding subarray. The function should use the binary search algorithm to search for the element provided as the second argument in the sorted array of arrays. If the element exists the function should return true, false otherwise. For example − If the input array is ...
Read MoreImplement a custom function similar to Array.prototype.includes() method using JavaScript
We need to create a custom JavaScript function that mimics the behavior of Array.prototype.includes(). This function should check if a value exists in an array and return a boolean result. Problem We are required to write a JavaScript function that lives on the prototype object of Array. It must take in a literal value, and return true if that value is present in the array it is being called upon, false otherwise. Basic Implementation Here's a simple implementation using a for loop to iterate through the array: const arr = [1, 2, 3, 4, ...
Read MoreAccumulating array elements to form new array in JavaScript
We are required to write a JavaScript function that takes in an array of numbers, arr, as the first argument and a number, num, (num ≤ length of array) as the second argument. Our function should add up each contiguous subarray of length num of the array arr to form corresponding elements of new array and finally return that new array. Problem Example For example, if the input to the function is: const arr = [1, 2, 3, 4, 5, 6]; const num = 2; Then the output should be: [3, ...
Read MoreHow to append data to element using JavaScript?
We can append data to an HTML element using JavaScript through several methods. The most common approaches include using the innerHTML property, appendChild() method, and the modern append() method. What is Element Appending? Appending data to an element means adding new content to the end of an element's existing content without replacing what's already there. This is essential for dynamic web applications where content needs to be added based on user interactions or data updates. Method 1: Using innerHTML Property The innerHTML property allows you to add HTML content as a string: ...
Read MoreHow to new line string - JavaScript?
In JavaScript, there are several ways to create new lines in strings depending on where the output will be displayed. For HTML content, use tags, while for console output or plain text, use the escape sequence . Using Tag for HTML Display When displaying text in HTML elements, use the tag to create line breaks: New Line in HTML Original Text ...
Read MoreObject to Map conversion in JavaScript
In JavaScript, you can convert an object to a Map using several approaches. Maps offer advantages over objects like guaranteed key insertion order and the ability to use any data type as keys. Suppose we have an object like this: const obj = { name: "Jai", age: 32, occupation: "Software Engineer", address: "Dhindosh, Maharashtra", salary: "146000" }; We need to convert this object into a Map while preserving all key-value pairs. Using Object.entries() (Recommended) The most concise approach uses Object.entries() with the Map ...
Read MoreIs uppercase used correctly JavaScript
In JavaScript, we can determine whether a string follows correct uppercase usage based on three specific rules. A string is considered to have correct uppercase usage if it meets any of these criteria: All letters in a word are capitals, like "INDIA". All letters in a word are not capitals, like "example". Only the first letter in a word is capital, like "Ramesh". We need to write a JavaScript function that takes a string and determines whether it complies with any of these three ...
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