javascript math negative to positive code example

Example 1: convert negative number to positive in javascript

Math.abs("the negative number")

Example 2: check if number is negative javascript

Math.sign() has 5 possible return values:
1 // positive number
-1 // negative number
0 // positive zero
-0 // negative zero
NaN // not a number

Example 3: javascript convert minus to plus

var x = 20;
x *= -1;

Example 4: javascript convert minus to plus

var posNum = (num < 0) ? num * -1 : num; // if num is negative multiple by negative one ...