Salesforce JavaScript Developer Practice Exam

When you execute the code const numbers = [1, 2, 3]; numbers[10] = 11; console.log(numbers); what will be the output?

1. [1, 2, 3, 7 x null, 11]

2. [1, 2, 3, 11]

3. [1, 2, 3, 7 x empty, 11]

4. SyntaxError

The correct answer is: [1, 2, 3, 7 x empty, 11]

When the code is executed, the output will indeed be an array reflecting the newly assigned value at the index 10, while the indices from 4 to 9 will be uninitialized. This results in an array showing the counted elements followed by a series of empty slots. Here's how it works: - The array `numbers` is initialized with three elements: `[1, 2, 3]`. - When you assign `numbers[10] = 11;`, you're creating an element at index 10, leaving the indices from 4 to 9 undefined or empty. - As a result, if you print the array using `console.log(numbers)`, it will show the elements up to index 3, then display seven "empty" slots (not filled with any value), and finally include the value `11` at index 10. In many JavaScript environments, unassigned indices in arrays show as "empty" when logged to the console, which represents the gaps clearly. Hence, the result is an array representation of three defined elements followed by the count of empty slots leading to the value at index 10, confirming that the output is `[1, 2, 3, 7 x empty,