To check if a textarea is empty we use if(e.target.value), true or false will be returned. true when its not empty false if it's empty.

To add an item into specific index in JavaScript array, the most efficient way to add element at specific array position is to use JavaScript Array.splice() method.

Let's see how we can use indexOf() and splice() array methods to remove an item from an array. what is the fastest and best performant way to remove array item?

How to use JavaScript array methods, and what are the most common array methods for JavaScript? Learn array methods with example.

The JavaScript includes() method determines whether an array includes a certain value, If array contains it returns true and if doesn't it will return false.

The JavaScript array concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

The JavaScript sort method sorts the elements of an array and returns the sorted array. The default sort order is ascending, but you can also sort array in descending order.

The main difference between JavaScript indexOf and findIndex methods are functions parameters. IndexOf expects a value as first parameter while findIndex expects a callback as first parameter.

JavaScript findIndex() method is used to return index of first matching element from an array, will return -1 if no match was found.

JavaScript indexOf method is used to return index of first matching element from an array, will return -1 if no match was found.

The JavaScript find, filter and some methods are similar and very different. Let's see few examples to learn the difference and usage between them.

JavaScript array find method searches an array and returns the first matching element found, or it will return undefined if no match is found.