Array splice() Method

The Array splice() method removes/adds new elements from/to an array and returns the removed element(s) in an array. The syntax for this method is

array.splice(index,number,element1, ... elementN); 

We consider an array named os consisting of four elements

			var os = ["Debian", "Fedora", "openSUSE", "Ubuntu"];
			

Applying the splice() method, we set the first parameter as 1 for the starting index, the second parameter as 0 which will remove zero elements and the third parameter "Gentoo" to be inserted as an element into the array

			var remove = os.splice(1,0,"Gentoo");
			

and the new modified array os with one element more becomes

			["Debian", "Fedora", "Gentoo", "openSUSE", "Ubuntu"];
			

The variable remove, which holds the removed element/elements is an empty array [] as no element is removed. Next we set the index at 2, the number of elements to be removed as 1, and do not provide the third parameter

			var remove = os.splice(2,1);
			

One element at index 2 is removed ("Gentoo"), and the new modified array os with one element less becomes

			["Debian", "Fedora", "openSUSE", "Ubuntu"];
			

The variable remove now is an array with one element ["Gentoo"]. Below is an example where the third element of the new array "openSUSE" (at index 2) is removed and replaced with "Gentoo"

			var remove = os.splice(2,1, "Gentoo");
			

The variable remove now holds an array with the element ["openSUSE"] and the new array os has become

			["Debian", "Fedora", "Gentoo", "Ubuntu"];