round() function, which rounds an integer:
const result = round(10.25, 0); // 10
We pass two parameters to it: the number to round and the precision of rounding.
0 means that it will round to an integer, and the decimal part will simply be discarded.
In most cases, we need to round exactly to an integer (and not to tenths, for example), so designers of the
round() function have made the second parameter optional and set it to a default value of
0. So, you can choose to not specify the second parameter and the result will be the same:
const result = round(10.25); // 10
We can specify precision by passing another parameter:
// rounding to one decimal place const result = round(10.25, 1); // 10.3
Round up the value of the constant
number to two decimal places and print the result.
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
My code is different from the teacher's one 🤔
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
I've read the lessons but nothing is clear 🙄
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.
Default parameter is an optional function parameter.