What will be the output of console.log(arr.map(x => x * 2)) for the array [1, 4, 9, 16]?

The output of console.log(arr.map(x => x * 2)) for the array [1, 4, 9, 16] will be a new array where each element of the original array has been multiplied by 2. The method map creates a new array based on the results of calling a provided function on every element in the calling array.

In this case, the function is x => x * 2, which takes each element x from the array and multiplies it by 2. Here's the breakdown of the calculations:

• For the first element, 1 * 2 results in 2.

• For the second element, 4 * 2 results in 8.

• For the third element, 9 * 2 results in 18.

• For the fourth element, 16 * 2 results in 32.

Therefore, when the original array [1, 4, 9, 16] is processed through the map function, the resulting array becomes [2, 8, 18, 32].

This demonstrates how the map function can be utilized to transform the elements of an array based on