Changing Positivity and Negativity of Numbers in a List in JavaScript

We are required to write a JavaScript function that takes in an array of positive as well as negative Numbers and changes the positive numbers to corresponding negative numbers and the negative numbers to corresponding positive numbers in place.

Example

The code for this will be −

const arr = [12, 5, 3, -1, 54, -43, -2, 34, -1, 4, -4];
const changeSign = arr => {
   arr.forEach((el, ind) => {
      arr[ind] *= -1;
   });
};
changeSign(arr);
console.log(arr);

Output

The output in the console −

[
   -12, -5, -3, 1, -54,
   43, 2, -34, 1, -4,
   4
]