Question

What parameters does Array.splice() accept?

Answer 1

In JavaScript, the Array.splice() method accepts two mandatory parameters: 'start' (where to begin changes) and 'deleteCount' (how many elements to remove) as well as additional optional parameters representing elements to be added at the start index.

Step-by-step explanation:

The Array.splice() method in JavaScript accepts two mandatory parameters and additional optional parameters. The two mandatory parameters are:

• start: An index at which to start changing the array. If greater than the length of the array, actual starting index will be set to the length of the array.
• deleteCount: An integer indicating the number of elements in the array to remove from start.

Optional parameters are element1, element2, ..., elementN, which are the elements to add to the array, starting at the start index.

Here is a step-by-step explanation using a simple example:

1. Declare an array: let myArray = ['one', 'two', 'three', 'four', 'five'];
2. Use the splice method: myArray.splice(2, 1, 'newElement');
3. The above line will remove 'three' and insert 'newElement' at index 2.

After this operation, myArray will be ['one', 'two', 'newElement', 'four', 'five'].