Question

What happens if we [1,2,3].slice(-2)?

Answer 1

If we call the `slice()` method on the array `[1, 2, 3]` with the argument `-2`, it will return a new array containing the last two elements of the original array.

Here's a step-by-step explanation of what happens:

1. The `slice()` method is called on the array `[1, 2, 3]` with the argument `-2`.

2. The negative value `-2` is interpreted as an index from the end of the array. In this case, it refers to the second-to-last element.

3. The `slice()` method creates a new array containing the selected elements.

4. Since the index `-2` corresponds to the second-to-last element, the new array will contain `[2, 3]`.

To summarize, calling `[1, 2, 3].slice(-2)` will return a new array `[2, 3]` containing the last two elements of the original array `[1, 2, 3]`.

Answer 2

Answer:When we use the slice() method on an array, it allows us to extract a portion of the array and create a new array containing those elements. The slice() method takes two arguments, the starting index and the ending index.

In the case of [1, 2, 3].slice(-2), the negative index -2 is used as the starting index. When a negative index is provided, it counts from the end of the array. So, -2 corresponds to the second-to-last element in the array, which is 2.

Since we did not provide an ending index, the slice() method will extract all the elements from the starting index to the end of the array. Therefore, [1, 2, 3].slice(-2) will return a new array [2, 3].

To clarify this with an example, let's consider the array [1, 2, 3, 4, 5]. If we use the slice() method with [-3] as the starting index, it will count from the end and select the third-to-last element, which is 3. If we don't provide an ending index, the slice() method will extract all elements from the starting index to the end of the array. So, [1, 2, 3, 4, 5].slice(-3) will return a new array [3, 4, 5].

Overall, when we use [1, 2, 3].slice(-2), it will create a new array containing the last two elements of the original array, which are 2 and 3

Explanation: