let total = 0, count = 1; while (count <= 10) { total += count; count += 1; } console.log(total);

Question

Why is total = 55?

Answer 1

while loop is making sum of numbers from 1 to 10 as value of count is from 1 to 10. Value is getting add to total resulting in 55.

1+2+3+4+...+10 = 55

Therefore answer is 55.

Answer 2

your loop in practice making the sum 1+2+...+10 which result is 55

Answer 3

The author of Eloquent JavaScript helped me understand this one when he said this block of code could look like this:

console.log(sum(range(1,10)));

if we happened to have convenient operations like sum and range available.