Salesforce JavaScript Developer Practice Exam

What will be the result of the following code: arr.map(x => x * 2) on the array [1, 4, 9, 16]?

1. [2, 4, 9, 16]

2. [2, 8, 18, 32]

3. [1, 8, 18, 32]

4. [2, 4, 16, 32]

The correct answer is: [2, 8, 18, 32]

The result of using the `map` function with the provided code is that it takes each element of the original array and applies the function that doubles its value. The `map` method creates a new array populated with the results of calling the provided function (in this case, `x => x * 2`) on every element in the array. Given the original array `[1, 4, 9, 16]`, let's walk through how the `map` function processes each element: 1. For the first element `1`: - The function doubles this value, resulting in `2`. 2. For the second element `4`: - The function doubles this value, resulting in `8`. 3. For the third element `9`: - The function doubles this value, resulting in `18`. 4. For the fourth element `16`: - The function doubles this value, resulting in `32`. Thus, after processing all elements of the original array, the resulting new array will be `[2, 8, 18, 32]`. This is why the correct answer is indeed the one that reflects this transformation. The reasoning clearly follows the use of the `map` function in