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Articles by AmitDiwan
Page 428 of 840
Using methods of array on array of JavaScript objects?
JavaScript array methods work seamlessly with arrays of objects. These methods allow you to manipulate, search, and transform object arrays efficiently. Basic Array Methods on Object Arrays Common array methods like push(), pop(), and splice() work directly on arrays containing objects: Array Methods on Objects body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; ...
Read MoreJavaScript - Converting array of objects into object of arrays
In this article, we will learn to convert an array of objects into an object of arrays in JavaScript. When working with JavaScript, it's common to handle arrays of objects representing structured data. A frequent challenge is grouping these objects based on a shared property and transforming the result into a new data structure. Problem Statement The goal is to convert an array of objects into an object of arrays where the keys represent a specific property (e.g., roles) and the values are arrays of corresponding data (e.g., player names). Input const team = [ ...
Read MoreMake array numbers negative JavaScript
In JavaScript, you can convert all positive numbers in an array to negative while keeping already negative numbers unchanged. This is useful for data transformations where you need to invert positive values. Let's say we have the following array: const arr = [7, 2, 3, 4, 5, 7, 8, 12, -12, 43, 6]; We need to write a function that converts all positive numbers to negative while leaving negative numbers unchanged (like 4 to -4, 6 to -6, but -12 stays -12). Using Array.reduce() const arr = [7, 2, 3, 4, 5, ...
Read MoreConvert HTML table to array in JavaScript?
Converting an HTML table to an array in JavaScript involves extracting data from table cells and storing them in a structured format. This is commonly done using DOM manipulation methods or jQuery. HTML Table Structure Let's start with a sample HTML table: Name Age John 23 ...
Read MoreFinding the element larger than all elements on right - JavaScript
We are required to write a JavaScript function that takes in an array of numbers and returns a subarray that contains all the elements from the original array that are larger than all the elements on their right. Problem Understanding For each element in the array, we need to check if it's greater than every element that comes after it. If yes, include it in the result. The last element is always included since there are no elements to its right. Algorithm Approach We can solve this efficiently by traversing the array from right to left, ...
Read MoreExplain Deep cloning an object in JavaScript with an example.
Deep cloning creates a completely independent copy of an object, including all nested properties. Unlike shallow copying, changes to the cloned object don't affect the original. Shallow vs Deep Copy Problem With shallow copying, nested objects are shared between original and copy: Shallow Copy Problem let original = { name: "John", ...
Read MoreHow to exclude certain values from randomly generated array JavaScript
We need to create a function that generates an array of random numbers while excluding certain values. The function takes two arguments: the desired array length and an array of numbers to exclude. Requirements: Generate random numbers between 0 and 100 Exclude numbers present in the exclusion array No duplicate numbers in the result Example const absentArray = [44, 65, 5, 34, 87, 42, 8, 76, 21, 33]; const len = 10; const generateRandom = (len, absentArray) => { const randomArray = []; for(let i ...
Read MoreIs it possible to display substring from object entries in JavaScript?
Yes, you can display substrings from object entries in JavaScript using Object.fromEntries() combined with string methods like substr() or substring(). This technique allows you to transform object keys while preserving their associated values. Syntax Object.fromEntries( Object.entries(object).map(([key, value]) => [key.substr(startIndex, length), value] ) ) Example: Extracting Substring from Object Keys const originalString = { "John 21 2010": 1010, "John 24 2012": 1011, "John 22 2014": ...
Read MoreHow to create a constant array in JavaScript? Can we change its values? Explain.
To create a const array in JavaScript, we use the const keyword before the array name. While the array reference cannot be reassigned, individual elements can be modified. A const array prevents reassignment of the entire array but allows mutation of its contents. This is because const creates an immutable binding, not an immutable value. Syntax const arrayName = [element1, element2, element3]; Example: Creating and Modifying a Const Array Const Array Example ...
Read MoreHow to parse a string from a JavaScript array?
In JavaScript, you can convert an array to a string using several built-in methods. The most common approaches are toString(), join(), and JSON.stringify(). Using toString() Method The toString() method converts an array to a comma-separated string: Array to String Conversion Parse a string from a JavaScript array Convert Array to String ...
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