Why is there a comparison with 0 ?
if (i% 3 == 0)
As I understand it, there is a division without a remainder, but I don’t understand why then compare.
Answer 1, authority 100%
This is a check that the remainder of dividing the number i by another number (3 ) is 0.
This is usually done in order to perform some action in a loop, but not every time (in this case, only every 3 times).
For example:
- color every 2nd line in the list with a different color
if (i% 2 == 0) ... - show progress on the screen every 10 iterations
if (i% 10 == 0) ... - split the stream of digits by adding a space after every 3
if (i% 3 == 0) ... - etc.
Answer 2, authority 67%
The % sign is to get the remainder of the division, in your case it is a check that the number i is divisible by 3 .
You can read more about JS operators here
Answer 3, authority 11%
This is a modulus operator that returns the remainder of a division. For example, 18% 7 will equal 4 (roughly 18 - 14 = 4 ). And if you check any number for zero, then you check if this number is evenly divisible by some one.