Salesforce JavaScript Developer Practice Exam

What will the output be in the console for the following code: const months = ['Jan', 'March', 'April', 'June']; months.splice(3, 1, 'May'); console.log(months);?

1. ["Jan", "March", "April", "June"]

2. ["Jan", "March", "April", "May"]

3. ["March", "April", "June", "May"]

4. ["Jan", "April", "June", "May"]

The correct answer is: ["Jan", "March", "April", "May"]

In the provided code, the `splice` method is executed on the `months` array. This method is used to add or remove elements from an array. The syntax of the `splice` method is `array.splice(start, deleteCount, item1, item2, ...)`, where `start` is the index at which to start changing the array, `deleteCount` is the number of elements to remove, and `(item1, item2, ...)` are the elements to add to the array starting at the `start` index. In this case, the code executes `months.splice(3, 1, 'May')`. The `start` index is 3, which corresponds to the fourth item in the array (since indexing begins at 0). The second argument, `1`, indicates that one element should be removed at that index. The third argument, `'May'`, specifies that this element will be added at the same index where the removal occurs. Initially, the array is `['Jan', 'March', 'April', 'June']`. At index 3, the value is `'June'`. The `splice` method removes `'June'` and adds `'May'` in its place. As