Array of light

arrayOfLight.js

var arrayOfLight = function(positiveNumber){
    if (positiveNumber < 0 ) { 
        alert("Number must be a positive");
    } else { 
        var result = [];
        for (i=0; i <= positiveNumber;i++) { 
            result[i] = i;
        }
        console.log(result);
    }
}

arrayOfLight(5);