What will the console output be for console.log(arr.filter(x => x % 2)) with arr being [1, 4, 9, 16]?

What will the console output be for console.log(arr.filter(x => x % 2)) with arr being [1, 4, 9, 16]?

• A. [1, 9]
• B. [4, 16]
• C. undefined
• D. [1, 4, 9, 16]

Answer: (A)

The expression `arr.filter(x => x % 2)` is used to filter the elements of the array based on whether they are odd or not. When you pass a function to the `filter` method, it creates a new array with all elements that pass the test implemented by the provided function. In this case, the function `x => x % 2` checks each element `x` of the array `arr`. The modulus operator `%` returns the remainder of the division of `x` by `2`. If `x` is odd, `x % 2` will return `1` (which is a truthy value), so that element will be included in the new array. If `x` is even, `x % 2` will return `0` (which is a falsy value), so that element will be excluded from the new array. Given the array `[1, 4, 9, 16]`: - 1 is odd, so it passes the filter. - 4 is even, so it does not pass the filter. - 9 is odd, so it passes the filter. - 16 is even, so it does not pass the filter. Thus,

The expression arr.filter(x => x % 2) is used to filter the elements of the array based on whether they are odd or not. When you pass a function to the filter method, it creates a new array with all elements that pass the test implemented by the provided function.

In this case, the function x => x % 2 checks each element x of the array arr. The modulus operator % returns the remainder of the division of x by 2. If x is odd, x % 2 will return 1 (which is a truthy value), so that element will be included in the new array. If x is even, x % 2 will return 0 (which is a falsy value), so that element will be excluded from the new array.

Given the array [1, 4, 9, 16]:

• 1 is odd, so it passes the filter.

• 4 is even, so it does not pass the filter.

• 9 is odd, so it passes the filter.

• 16 is even, so it does not pass the filter.

Thus,