javascript convert minus to plus

Math.abs("the negative number")

Math.abs(-4)//returns 4
Math.abs(4)//returns 4

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

var x = 20;
x *= -1;

function plusMinus(arr) {     let positives = 0, negatives = 0, zeros = 0;     const len = arr.length || 0;           if (len > 0 && len <= 100) {          arr.map((elem, key) => {               if (elem > 0) {                    positives++;               } else if (elem < 0) {                    negatives++;                } else {                    zeros++;               }                                 return elem;           });      }           console.log((positives / len) || 0);     console.log((negatives / len) || 0);     console.log((zeros / len) || 0);      }