Invert number signs

Given an array of values, invert the sign of every values. 5 becomes -5, -10 becomes 10.

Sample Code:

function signInvert(arr) {
// Enter your logic here...
}

Examples:

Input: [-1,2,-3,4,-5]
Output: [1,-2,3,-4,5]
Explanation: -1 becomes 1, negative numbers become positive, and so on.

Input: ['-1',2,'-3',4,'-5']
Output: [1,-2,3,-4,5]
Explanation: 2 becomes -2, positive numbers become negative numbers, and so on.