JS fibonacci (For loop + if else + arr)

function fibonacciGenerator (n) {
//Do NOT change any of the code above 👆

    //Write your code here:
    if (n===1){
        return [0];
    }
    if (n===2){
        return [0,1];
    }

    var arr = [0,1];

    for(var i=2; i<n ; i++){
        arr.push(arr[i-1]+arr[i-2]);
    }

    return arr;

    //Return an array of fibonacci numbers starting from 0.

//Do NOT change any of the code below 👇
}