The variable arr remains the same after the execution of the slice statement, whereas the splice statement was updating the actual array. Notice that, here, we gave the second argument as 6 and not 5.Īfter executing the above code, we get the values as: arr // slicedArr // To get a slice of an array from values, we write: var slicedArr = arr.slice(2, 6) StartIndex - The starting index for the sliced array we need to get with startIndex included.ĮndIndex (optional ) - The ending index up to which the slicing is to be done, with endIndex excluded. We can only delete elements from an array using the slice function Array.slice signature arr.slice(startIndex, endIndex) While splice can also insert and update elements of an array, the slice function is used only to remove elements from an array. We get the following values for arr and arr2 after executing the above code snippet: arr2 // as we deleted the element 3 from the array arr // // 3 gets replaced with 100 in array arr To replace 3 with 100, we write: var arr2 = arr.splice(3, 1, 100) // which means - at index 3, delete 1 element and insert 100 We can cleverly modify an existing element in an array using splice so that we delete the item at an index and insert a new element in its place.
The final values will be: arr2 //, since we didn't deleted an element from an array arr // Modifying an existing element
To add new items to an array, we write: const arr = var arr2 = arr.splice(2, 0, 100, 101) Īt 2, this will add the numbers 100 and 101. As a result, we get: deletedItems // arr // Adding new elements This will delete one element, starting from index 3 and returns the deleted array. To remove elements from an array, we write: var deletedItems = arr.splice(3, 2) Using the splice function updates the original array.Ĭonsider the following array: const arr = Īrray.splice signature: arr.splice(fromIndex, itemsToDelete, item1ToAdd, item2ToAdd. Splice is used to modify the content of an array which includes removing elements, replacing existing elements, or even adding new elements to an array.
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