To get first n elements of an array in JavaScript, you can use any of these methods – Use Array.slice() method with 0 as the first argument and n as the second argument. Use Array.filter() method with a callback function that takes an element as argument and returns true if the index of the element … Read more
To find the difference between two arrays in JavaScript, you can use the following methods – Array.prototype.filter() and indexOf() method Array.prototype.filter() and includes() method Set object jQuery methods Underscore/Lodash library Find The Difference Between Two Arrays In JavaScript Let’s look at these methods one by one, but let’s first start by understanding what difference means … Read more
To filter an array with multiple conditions in JavaScript, you can use the filter() method. The filter() method accepts a callback function that will be called for each element in the array. Use the && condition inside the callback function to check for multiple conditions. Filter An Array With Multiple Conditions In JavaScript If you … Read more
To replace an element in an array in JavaScript, you can use any of the following methods – Using index of the element Using indexOf() method Using map() method Using splice() method Using findIndex() method Let’s see each of these methods in detail. How To Replace An Element In An Array In JavaScript Replacing An … Read more
To parse a JSON Array in JavaScript, pass the JSON Array string to the JSON.parse() method. This method parses the string and returns a JavaScript equivalent. If the JSON String is invalid, it will throw a SyntaxError. How To Parse A JSON Array In JavaScript Use the JSON.parse() method to parse a JSON Array into … Read more
To remove an object from an array by it’s value in JavaScript, we can use two methods – Use the findIndex() and splice() methods Use the filter() function There are a few differences between the two approaches, so it’s important to understand when to use each one. Remove An Object From An Array By It’s … Read more
You can check if array contains an object in JavaScript by using any one of these methods – Use the Array.some() method Use the Array.find() method Use the Array.findIndex() method Use the Array.filter() method Let’s discuss each of these methods in detail. Use the Array.some() method To Check If Array Contains an Object in JavaScript … Read more
You can convert map values to an array in JavaScript using any of these methods – Array.from() and map.values(). These methods are part of the built-in JavaScript ecosystem and therefore work on all browsers. The spread operator and map.values() methods. Using forEach() loop. Using keys() method. Let’s discuss each of these methods in detail. Convert … Read more
To push an element in a JavaScript array if it doesn’t exist – For primitive values, use the Array.includes() or Array.indexOf() method to check if an element already exists, else push the element in the array. For objects, use the Array.findIndex() method to check if an element already exists, else push the element in the … Read more
To convert an array of objects to a Map in JavaScript – Use the Array.map() method to convert the array of objects to an array of key-value pairs and pass this array to the Map() constructor. You can also use a forEach loop to iterate over the array of objects and add each key-value pair … Read more