abs
The absolute value of a number.
Math.abs(-5);
When you want to know how much a number is without its sign (+/-). The absolute value of -5 is 5 and the the absolute value 5 is also 5. The absolute value is sometimes called the magnitude.
Parameters
- x: The number to return the absolute value for. This can be a negative number (
-1), positive number (6), or0. 
Returns
- a number that is the absolute value of number in 
x. 
Example
Find the absolute value of -34. Do some checks to make sure the absolute value is really 34. Set the value to 0 if the checks fail.
let pos = Math.abs(-34);
if (pos > 0) {
    if (pos != 34) {
        pos = 0;
    }
} else {
    pos = 0;
}