Plus Minus | HackerRank | JavaSctipt Solution

function plusMinus(arr){
    let posCount = 0;
    let negCount = 0;
    let zerCount = 0;
    for(let i=0; i<=arr.length; i++){
        if(arr[i]>0){
            posCount +=1;
        }
        else if(arr[i]<0){
            negCount += 1;
        }
        else if(arr[i] == 0){
            zerCount +=1

        }
        
    }
    console.log((posCount/arr.length).toFixed(6)); 
    console.log((negCount/arr.length).toFixed(6)) ;
    console.log((zerCount/arr.length).toFixed(6));

}
console.log(plusMinus([1,2,3,-1,-2,-3,0,0]))