array

To sort an array with NULL values coming last in JavaScript, use a sort function that supports comparing null values. Let’s see how to do this, in this post. Sort An Array With NULL Values Coming Last In JavaScript The built-in Array.prototype.sort function does not support comparing null values by default. However, you can pass … Read more

To check if all values in array are equal in JavaScript, you can use any one of the following methods – Use the Array.every() method – The every() method tests whether all elements in the array pass the test implemented by the provided function. Use the Array.reduce() method – The reduce() method applies a function … Read more

To filter an array to only numbers in JavaScript, you can use the Array.filter() method and check if type of each element is number. How To Filter An Array To Only Numbers In JavaScript The following example shows how to filter an array to only numbers in JavaScript. As you can see from the output, … Read more

To check if an array contains duplicates in JavaScript, you can use any of these methods – Pass the array to the Set constructor and check if the size of the Set is equal to the length of the array. If not, the array contains duplicates. Use the some() method and check if there is … Read more

To count the duplicates in an array in JavaScript, you can use any of the following methods – Use the forEach() method to iterate over the array, and on each iteration increment the count of the elements. Use the reduce() method to iterate over the array, and on each iteration increment the count of the … Read more

To get the intersection of two arrays in JavaScript – Convert both the arrays to sets to get the unique elements of each array. Convert the first set to an array using the spread operator and call a filter() method passing it a function. On each iteration, check if the element in the array is … Read more

To convert all array elements to uppercase, you can use any of these methods – Use the Array.map() method to iterate over the array and convert each element to uppercase. Use the Array.forEach() method to iterate over the array and push each element to a new array after converting it to uppercase. Let’s discuss each … Read more

To remove first and last array elements in JavaScript, you can use any of these methods – Use the Array.shift() and Array.pop() methods to remove the first and the last element respectively, in place. Use the Array.slice() method to create a copy of the array and remove the first and the last elements of the … Read more

To remove undefined values from an array in JavaScript, you can use any of these methods – Use the Array.filter() method to filter all the values from the array that are not undefined. The Array.filter() method returns a new array that doesn’t contain undefined values. Use the Array.forEach() method to iterate over the array, and … Read more