What’s wrong with the JavaScript coding?

Question

What’s wrong with the JavaScript coding, I think I am very close to the answer. I have got NaN in the output. It’s a practice question in SoloLearn. See 2 lines of coding I wrote below:

Question:

The player receives points after passing each level of a game.
The program given takes the number of passed levels as input, followed by the points gained for each level, and creates the corresponding array of points.
Complete the program to calculate and output to the console the sum of all gained points.

Sample Input
3
1
4
8

Sample Output
13

Explanation
The first input represents the number of passed levels, -- in this case, 3 (the size of an array to be created). The next 3 inputs are the points awarded to the player for passing each level. The player gained 1+4+8 points for 3 passed levels, which is then output.

Coding:

function main() {
//take the number of passed levels
var levels = parseInt(readLine(),10);
var points = new Array();

var count = 0;
while(count<levels){
var elem = parseInt(readLine(),10);
points[count] = elem;
count++;
}

var sum = 0;
//My coding line1 calculate the sum of points

var i = points.length;
for (i=1;i<=levels;i++)
{sum=points[i]+sum};

//My coding line2 output
console.log(sum);

}

Answer 1

It should be i<levels

Answer 2

thanks

Answer 3

Also you stored from points[0] but counting from points[1] and points[4] not defined. Must be i=0 & i<levels only..

Answer 4

i corrected the coding and the following works:

var i = points.length;
for (i=1;i<=levels;i++)
{sum=points[i-1]+sum};