array

To remove empty elements from an array in JavaScript – Use a filter() method and pass it a function. This function will return a new array, with only those values that are not null or undefined. You can also use the forEach() method to iterate over the array and use a conditional statement to check … Read more

To find odd numbers in an array in JavaScript – Use the filter() method, passing it a function. In each iteration, check if the current number is not divisible by 2, if it isn’t, then it must be an odd number so return true. The filter() method will return a new array with all the … Read more

To replace the first element of an array in JavaScript, you can use any of these methods – Use the array index to access the first element and assign it a new value. Use the splice() method to replace the first element of an array. Use the slice() method along with the spread operator to … Read more

To check if two arrays contain common elements in JavaScript – Use the some() method on the first array, passing it a function. The function will check if the element present in arr1 is also present in arr2. If there is such an element, then it will return true, else false. Let’s discuss this method … Read more

To update all elements in an array in JavaScript, you can use any of these methods – Use the Array.forEach() method on the array, passing it a function and on each iteration, update the element of the array. Use the Array.map() method on the array, passing it a function and on each iteration, update the … Read more

To use forEach() on an array in reverse order in JavaScript, you will need to create a copy of the array, reverse the new array and then use forEach() on that new array. Let’s discuss this method in detail below. Use forEach() On An Array In Reverse Order In JavaScript This can be done with … Read more

To create an array if it doesn’t exist in JavaScript – Check if the type of the variable is undefined or if the variable is not an array. If any of the above holds true, create a new array using var variable. Let’s discuss this in detail below. Create An Array If It Doesn’t Exist … Read more

To find even numbers in an array in JavaScript – Use the filter() method on the array, passing it a function. This function will take in each element of the array as a parameter (which we have named “num”) and return true if the number is even, or false otherwise. The numbers that return true … Read more

To convert an array to JSON in JavaScript, use the JSON.stringify() method. This method accepts an argument and converts it to a JSON string. Let’s discuss this method in detail below. Convert An Array To JSON In JavaScript The JSON.stringify() method is used to convert an array to JSON in JavaScript. This method accepts an … Read more

To get the max/min date from an array of objects in JavaScript – Call the map() method to get an array of Date objects. For each Date object, pass the date to the Date() constructor to get a timestamp. Find the max/min timestamp with Math.max() and Math.min(). Let’s discuss this method in detail below. Get … Read more