Bhawna To check if a String contains only digits in JavaScript, use the RegExp.test() method. The RegExp.test() method accepts a regular expression as an argument and returns true or false depending on whether the given string matches the regular expression. Alternatively you can use a for Loop to iterate over the characters in the string and … Read more
To convert milliseconds to hours, minutes and seconds in JavaScript – Divide the milliseconds by ‘1000’ to convert milliseconds to seconds. Divide the seconds by ’60’ to convert seconds to minutes. Divide the minutes by ’60’ to convert minutes to hours. You can use the modulus (%) operator to get the remainder from the division. … Read more
To check if a date is tomorrow’s date using JavaScript – Use the Date constructor to get the current date. Add 1 to the current date to get tomorrow’s date. Use toDateString() method to compare the date with tomorrow’s date. If the two dates are equal, then it is tomorrow’s date. Check If A Date … Read more
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 check if Object is NOT instance of class in JavaScript, use the instanceOf operator. The instanceof operator returns true if the specified object is an instance of the class, otherwise it returns false. Check if Object is NOT instanceof Class in JavaScript To check if Object is NOT instanceof class in JavaScript, use the … 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 check if a variable is defined in JavaScript, you can use any of these methods – typeof operator try/catch block window.hasOwnProperty() Let’s have a look at each of these methods in detail. But before that, let’s understand the difference between defined/undefined and initialized/uninitialized variables in JavaScript. Check If A Variable Is Defined In JavaScript … Read more
To check if a String is empty in JavaScript, you can use any of the following methods – Use the === operator Use the typeof and length() method Use the typeof and str!==”” method Let’s take a look at each of these methods in detail. Check If A String Is Empty In JavaScript The === … Read more
You can check if a key exists in an object in JavaScript using any of the following methods – Using the ‘key’ in ‘object’ syntax Using the hasOwnProperty() method Using the lodash library Using optional chaining (?.) Let’s have a look at each of these methods in detail – Check If A Key Exists In … 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