JavaScript: Functions with variadic parameters
Some functions have the interesting feature of accepting an indefinite number of parameters. And we're not talking about default values. Check out this example:
Math.max(1, 10, 3); // 10
The function Math.max() finds the maximum value among the passed parameters. How many parameters do you think it expects? This function's documentation shows something interesting:
Math.max([value1[, value2[, ...]]])
The way it is written means this function accepts any number of parameters (even none). The optional parameters are specified by square brackets [ ], and so are the optional parameters with default values. The ability to pass any number of parameters is encoded with [, ...].
Math.max(1, -3, 2, 3, 2); // 3
Instructions
Write a program to calculate the minimum value of 3, 10, 22, -3, 0, and print it. Use the function Math.min(), which works similarly to Math.max().
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('-3')
12})
13Teacher's solution will be available in:
