JavaScript: Infinity
The "divide by zero" error in programming is well known. In low-level languages, it causes the program to fail and restart. Where others fail, JavaScript continues to work.
console.log(1 / 0); // ?
Try to execute this code in your browser console. You will see Infinity displayed on your screen. For those who have studied further mathematics (hi, math geeks!), this is not a surprise. Division by zero creates infinity. Infinity in JavaScript is a real number, and you can perform various operations with it. In day-to-day problems, this makes little sense, since most operations with infinity end in infinity, for example, when we add a number to infinity we get infinity anyway.
Infinity + 4; // Infinity
Infinity - 4; // Infinity
Infinity * Infinity; // Infinity
However, there are several examples where infinity is needed. This question is discussed in more detail on Hexlet.
Instructions
Print the sum of infinities divided by 10.
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.
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Your exercise will be checked with these tests:
1// @ts-check
2
3import { expect, test, vi } from 'vitest'
4
5test('hello world', async () => {
6 const consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => { });
7 await import('./index.js')
8
9 const firstArg = consoleLogSpy.mock.calls.join('\n');
10
11 expect(firstArg).toBe('Infinity')
12})
13Teacher's solution will be available in:
