The Math.ceil method rounds a number.
For example, 2.1 is rounded up to 3:
While Math.round finds
the nearest integer
to the value passed to it,
Math.ceil finds the nearest integer
that is greater than
the value passed to it.
In the example given above,
the nearest integer to 2.1 is 2.
Hence we get the output 2
for Math.round(2.1).
However, even if 2
is the nearest integer to 2.1,
the value 2 is lesser than 2.1.
Since Math.ceil(2.1) will only
return a value greater than 2.1,
we get the next nearest integer,
i.e., 3 as the output.