What is the mistake in this java script code

Question

function main() {
var increase = parseInt(readLine(), 10);
var prices = [98.99, 15.2, 20, 1026];

//your code goes here
for(i=0;i>=prices.length ;i++){
prices=prices [i] +increase;

}
console.log(prices);

}

Answer 1

your condition should be less than the length of the array

i <= prices.length

Answer 2

We can do much better, we can just call a for loop telling to increase for each iteration of prices that it encounter to increase the price.

function main() {
var increase = parseInt(readLine(), 10);
var prices = [98.99, 15.2, 20, 1026];
//your code goes here
for(x in prices) //for each iteration in prices
prices[x] += increase // do price + increase
console.log(prices);
}