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Articles by AmitDiwan
Page 317 of 840
Removing duplicate values in a twodimensional array in JavaScript
When working with two-dimensional arrays in JavaScript, you may need to remove duplicate values that appear across different sub-arrays. This article shows how to create a function that removes all duplicate values from a 2D array, keeping only the first occurrence of each value. Problem Statement We need to write a JavaScript function that takes a two-dimensional array and returns a new array where duplicate values across all sub-arrays are removed, preserving only the first occurrence of each value. Example Here's how to implement this functionality: const arr = [ ...
Read MoreRemoving listener from inside outer function in JavaScript?
When working with event listeners in JavaScript, you might need to remove a listener from within an outer function. This is accomplished using removeEventListener() by passing the element reference and function reference to the outer function. How It Works The key is to pass both the element (this) and the function reference to the outer function, then use removeEventListener() to detach the listener. Example Remove Event Listener Example Press Me ...
Read MoreJavaScript: compare array element properties, and if identical, combine
When working with arrays of objects, you often need to combine objects that have identical properties. In this example, we'll consolidate storage devices with the same size by adding up their counts. Suppose we have an array of objects containing information about data storage devices: const drives = [ {size:"900GB", count:3}, {size:"900GB", count:100}, {size:"1200GB", count:5}, {size:"900GB", count:1} ]; console.log("Original array:", drives); Original array: [ { size: '900GB', count: 3 }, { size: '900GB', count: ...
Read MoreForming and matching strings of an array based on a random string in JavaScript
In JavaScript, we can check if strings from an array can be formed using characters from a given string. This involves counting character frequencies and matching them against each array element. Problem Statement Given an array of strings and a random string, find the first string from the array that can be completely formed using the characters available in the random string. const arr = ['Dinesh', 'Mahesh', 'Rohit', 'Kamal', 'Jatin Sapru', 'Jai']; const str = 'lsoaakjm'; console.log("Array:", arr); console.log("Available characters:", str); Array: [ 'Dinesh', 'Mahesh', 'Rohit', 'Kamal', 'Jatin Sapru', 'Jai' ] Available ...
Read MoreBring number down to 1 in JavaScript
Problem We need to write a JavaScript function that takes a number and finds the minimum operations to reduce it to 1 using these rules: If the number is even, divide it by 2 If the number is odd, add 1 or subtract 1 The function should return the minimum number of operations required. Example For input number 7, the output should be 4 operations: Input: 7 Output: 4 Output Explanation The optimal path requires 4 steps: 7 → 8 → 4 → 2 → 1 ...
Read MoreFinding the sum of all numbers in the nth row of an increasing triangle using JavaScript
For the purpose of this problem, an increasing triangle is a structure where numbers are arranged in rows, with each row containing one more number than the previous row, and all numbers are consecutive starting from 1. Understanding the Triangle Structure The increasing triangle looks like this: 1 2 3 4 5 6 7 8 9 10 Each row n contains n consecutive numbers. Row 1 has 1 number, row 2 has 2 numbers, row 3 has 3 numbers, and so on. Problem Statement We need ...
Read MoreHow to Become a JavaScript Developer?
A JavaScript developer is a programmer who specializes in creating interactive and dynamic web applications using JavaScript, the world's most popular programming language. JavaScript developers build everything from simple website interactions to complex single-page applications, mobile apps, and even server-side applications using Node.js. JavaScript developers work on both front-end development (user-facing interfaces) and back-end development (server-side logic). They collaborate with designers, other developers, and stakeholders to create responsive, user-friendly web experiences that run seamlessly across different browsers and devices. Essential Skills for JavaScript Developers To become a successful JavaScript developer, you'll need to master several core technologies ...
Read MoreHow to merge two strings alternatively in JavaScript
In JavaScript, merging two strings alternatively means combining characters from both strings one by one. This creates a new string where characters alternate between the first and second input strings. For example, if we have two strings: const str1 = 'abc'; const str2 = 'def'; console.log('String 1:', str1); console.log('String 2:', str2); String 1: abc String 2: def The expected output should be: adbecf Using Loop-Based Approach Here's a function that merges two strings alternatively by iterating through both strings simultaneously: const str1 = 'abc'; const ...
Read MoreGet price value from span tag and append it inside a div after multiplying with a number in JavaScript?
In JavaScript, you can extract a numeric value from a span element, multiply it, and display the result in another element. This involves getting the text content, converting it to a number, performing the calculation, and updating the DOM. HTML Structure First, let's create a proper HTML structure with a span containing the price and a div to display the result: Price Calculator Original ...
Read MoreLargest product of n contiguous digits of a number in JavaScript
We are required to write a JavaScript function that takes in two numbers as first and the second argument, let us call them m and n. The first number will generally be a number with multiple digits and the second number will always be smaller than the number of digits in the first number. The function should find the group of n consecutive digits from m whose product is the greatest. For example, if the input numbers are: const m = 65467586; const n = 3; Then the output should be: ...
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