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Activity for hkotsuboâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Answer | — |
A: What does a variable followed by parentheses ("ptr()") mean? `void (ptr)()` defines a function pointer. It says that `ptr` is a pointer to a function. But that function must have a `void` return type, and take an arbitrary number of parameters (that's what the empty parentheses defines). Then, `ptr = PrintHello` assigns the `PrintHello` function to the `p... (more) |
— | over 2 years ago |
| Suggested Edit | Post #285104 |
Suggested edit: Remove clutter and try to come up with a better title (more) |
helpful | over 2 years ago |
| Comment | Post #285019 |
@#36363 Could you add a link to the website, so we can at least check the HTML and try to see what the problem is? Because your code *should* work.
Just double checking the basic stuff: what does `document.querySelector("#example")` return? When you run your code, does any error message appear in th... (more) |
— | over 2 years ago |
| Comment | Post #285019 |
Maybe - and that's a *wild guess* - the JavaScript code is running before the HTML is loaded, and it can't find the input field. Check if the `script` tag is before the form and change it to be after. Or add an event listener to run after the page is loaded:
```javascript
document.addEventListene... (more) |
— | over 2 years ago |
| Comment | Post #284981 |
@#36363 I've made a simple test:
```javascript
var old = document;
document.write('abc');
console.log(old === document); // true
```
Which means that the document didn't change (only its child nodes). Another test to check if child nodes changed:
```javascript
// keep reference to origina... (more) |
— | over 2 years ago |
| Comment | Post #284981 |
@#36363 My understanding is that the document itself is not removed, only its child nodes. But I'll make more tests as soon as I can (more) |
— | over 2 years ago |
| Edit | Post #284981 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284981 | Initial revision | — | over 2 years ago |
| Answer | — |
A: document.open() and the DOM tree of the loaded (closed) browser window on which it works At the documetation you linked, if you click on "which will clear the document", it'll go to the documentation for `document.open`, and that page says in the beginning: > All existing nodes are removed from the document. And once removed, you can't retrieve them. Making a test in this page, ... (more) |
— | over 2 years ago |
| Edit | Post #284941 |
Post edited: Typo |
— | over 2 years ago |
| Edit | Post #284941 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284941 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284941 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Understanding createTreeWalker method in the context of replacing strings (or parts of them) > How does storing replaced strings in the `node` variable makes a change in the text appearing to the end user? In your case, you're changing the `textContent` property. When accessed, it returns the text content of a node, concatenated with the text content of its descendants, and changing its v... (more) |
— | over 2 years ago |
| Edit | Post #284928 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284928 |
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— | over 2 years ago |
| Edit | Post #284928 | Initial revision | — | over 2 years ago |
| Question | — |
Code block in comments is highlighted only when viewed in the thread's link Code blocks inside comments are hightlighted only if I'm on the comment's thread page. If I view it on the post itself (after expanding the respective thread), it's not highlighted. Example: in this post I clicked on the comment thread to expand it, and the code block is not highlighted: code... (more) |
— | over 2 years ago |
| Comment | Post #284911 |
@#53305 To add a little bit more pedantry, the filter predicate doesn't have to be exactly a boolean, because in Python [any object can be tested for truth value](https://docs.python.org/3/library/stdtypes.html#truth-value-testing). Which means I can do this:
```python
values = ['abc', '', [], ['... (more) |
— | over 2 years ago |
| Comment | Post #284853 |
@#36363 You're welcome, glad to help! (more) |
— | over 2 years ago |
| Edit | Post #284842 |
Post edited: Change title to make more clear what the question is about |
— | over 2 years ago |
| Suggested Edit | Post #284842 |
Suggested edit: Change title to make more clear what the question is about (more) |
helpful | over 2 years ago |
| Edit | Post #284853 |
Post edited: some "future-proof" stuff |
— | over 2 years ago |
| Edit | Post #284853 |
Post edited: some "future-proof" stuff |
— | over 2 years ago |
| Edit | Post #284853 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284853 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Change font-family with JavaScript To do that, you could change the selector from `body` to ``, as the other answer said. By selecting only `body`, it won't change child elements that has defined a more specific rule, and that's why you need to set the style for all of them. But there are some corner cases that I think it's worth e... (more) |
— | over 2 years ago |
| Comment | Post #284806 |
@#54649 I've made [this test](https://ideone.com/EkRHga) and surprisingly using string slices is faster than doing the math. Try to change the algorithm and see if it makes some difference (more) |
— | over 2 years ago |
| Comment | Post #284806 |
@#54649 For quick performance tests you can use the [`timeit` module](https://docs.python.org/3/library/timeit.html). I've made [a simple example](https://ideone.com/xjEhaR), and creating the function inside the loop was about 50%~60% slower. (more) |
— | over 2 years ago |
| Comment | Post #284806 |
You're creating the function inside the loop, so for every iteration a new function is created. But that's not needed at all, creating it just once outside the loop is enough.
Not sure how much it'll improve performance, but it certainly won't make it worse (more) |
— | over 2 years ago |
| Edit | Post #284803 |
Post edited: Improve title, make text more concise, add tags |
— | over 2 years ago |
| Edit | Post #284804 |
Post edited: |
— | over 2 years ago |
| Suggested Edit | Post #284803 |
Suggested edit: Improve title, make text more concise, add tags (more) |
helpful | over 2 years ago |
| Edit | Post #284804 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Separate digits of a number in groups with different sizes Before we start, I'd like to be a little bit pedantic regarding `00002451018` being a number. When we talk about numeric types/values, the zeroes at the beginning are irrelevant: `2`, `02` and `000002` all refer to the number two. The numeric value is `2`, and only the representation - the way the... (more) |
— | over 2 years ago |
| Edit | Post #284710 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284710 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284710 | Initial revision | — | over 2 years ago |
| Answer | — |
A: How do I support tab completion in a python CLI program? It depends. Do you want to have autocomplete on the shell the program runs in, or do you want the program to intercept the TAB key and do the autocomplete by itself? Shell autocomplete If you're running your program in a Linux shell, and want to autocomplete in the shell's command line (such ... (more) |
— | over 2 years ago |
| Comment | Post #284612 |
I agree that having some way to indicate the relevant versions can be useful in many cases, but I don't know what's the best way to do it (if I come up with something, I'll certainly post an answer). SE's attempt seems to be convoluted, but I guess only time will tell... (more) |
— | over 2 years ago |
| Edit | Post #284649 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284649 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284649 | Initial revision | — | over 2 years ago |
| Answer | — |
A: What is the purpose of `if __name__ == '__main__'`? It makes difference if the script is being imported. Let's suppose I have a file `myfile.py`: ```python myfile.py def somefunction(): print('do some stuff') print('calling function:') somefunction() ``` If I execute it directly (such as `python myfile.py`), the output is: ```n... (more) |
— | over 2 years ago |
| Edit | Post #284633 |
Post edited: minor fixes (removed duplicated "when", added punctuation, etc) |
— | over 2 years ago |
| Suggested Edit | Post #284633 |
Suggested edit: minor fixes (removed duplicated "when", added punctuation, etc) (more) |
helpful | over 2 years ago |
| Edit | Post #282066 |
Post edited: fix typo |
— | over 2 years ago |
| Edit | Post #284597 |
Post edited: |
— | over 2 years ago |
| Edit | Post #284597 | Initial revision | — | over 2 years ago |
| Answer | — |
A: What is HEAD in Git? First, we need to understand what a Git repository actually is. For that, refer to this article: it explains that a Git repository is actually a DAG (Directed Acyclic Graph). I'm not going into the mathematical details (which can be checked here), but basically, we can think of a Git repository as a ... (more) |
— | over 2 years ago |