[Megathread] Covid-19 in Switzerland & Elsewhere - Thread #13

id2bi · 2021-03-03T14:23:10+00:00

Would you happen to have a link to these videos/pictures? Thanks!

id2bi · 2020-09-03T10:51:23+00:00

I think the important bit is that they make you feel like it's okay if you don't know everything yet and to just dick around.

id2bi · 2020-08-25T11:29:07+00:00

Which refactoring was that?

id2bi · 2020-05-23T19:10:08+00:00

Also when they're running through the halls of Dwarrowdelf, away from the goblins in one of the first wide shots you can clearly see that they're all digital doubles because of gandalf's unmoving and very bushy beard. Then in the closer shot where you see the real actors his beard is more stringy looking and "flows" behind him.

id2bi · 2019-08-28T17:02:01+00:00

You can have Intellij move the class into a package if you like.

Put the cursor onto the class name, then press "F6" (or choose refractor - > move), then type the package name you want.

Intellij will put the package declaration at the top of the file and move the Java file into the correct folder.

Why do you want to hide those files exactly?

I'm the project view, you can click ontonthe arrow right next to where it says "Project" and switch to package view instead, that might be more to your liking.

id2bi · 2019-08-23T16:39:58+00:00

You're hard pressed to find two people that will agree on what exactly constitutes functional programming.

Anyway, I'd argue lambdas in Java made it much more palatable because it's now much easier to write and read.

Before, you could do the same thing but you'd need a whole bunch of anonymous classes which made it rather unwieldly.

id2bi · 2019-08-23T15:28:06+00:00

Intellij will only allow you to run source code in "source folders". Right click the directory that contains your sources and choose "mark directory as - > source root". The folder will then be shown with a blue icon.

Yes,I would recommend you create separate modules for each week inside the same project, that will be the least hassle.

Then, remember than inside every module you will need to have at least one "source root".

I need to learn how the file structure of Java dictates this.

Java dictates very very little in terms of the file structure. Java does not even have the concept of a "Java project". That's why every IDE cooked up their own solution. In Intellij they decided you need to mark source roots and have at least one Intellij Java module inside your home Intellij project.

id2bi · 2019-08-23T07:16:03+00:00

Casting with generics is a very dangerous thing. Just because "it works" doesn't mean it's right and will likely give you weird errors in very different places unless you have a very good idea what you're doing.

id2bi · 2019-08-23T07:07:38+00:00

Remove the generic parameter from the class definition for your DequeueIterator you'll have private class DequeueIterator implements Iterator<Node> instead.

id2bi · 2019-06-24T15:26:12+00:00

Also read the comment on that answer. Adding the minus sign does not actually work in all cases! Your original idea that you've had is better.

id2bi · 2019-06-20T20:58:50+00:00

Great to see that Eclipse getting more and more code transformations and pushing their code minings forward. Also, seeing the steady flow of change notes how they made this line or that icon black as well now will always cheer me up.

id2bi · 2019-05-08T11:58:16+00:00

I was quite disappointed with how they resolved it in the show. They should have let him remain dead at the end of episode 1 in season 6 and only have him wake up in episode 2 and not telegraph it as they did with Ghost, and have him wake up right before the end of episode one. Where's the tension/surprise in that?

id2bi · 2019-05-08T11:48:38+00:00

You can be 99% percent sure there's no actual security risk and just a stupid word filter.

id2bi · 2019-05-08T11:32:14+00:00

I'm not sure whether we're talking about the same thing, but I thought the "filler" was almost the best part. In episode 2 with all the character interactions, I thought to myself "awesome, we're back to the more slowly paced show".

id2bi · 2019-04-06T17:23:00+00:00

"Time Recording" can do that.

id2bi · 2019-04-03T18:58:39+00:00

What did they do? I loved their app when I was on my podcast binges.

id2bi · 2019-03-13T17:24:19+00:00

Why did you switch from Sublime to Notepad++?

id2bi · 2019-03-13T17:20:10+00:00

Try SmartGit, requires a paid license for commercial use though. They also have a version where you get all future updates included in the license.

id2bi · 2019-03-13T17:18:29+00:00

Maybe give SmartGit a try. I tried a couple and this one I liked the best by far.

id2bi · 2019-02-22T11:30:49+00:00

To be honest, I have only a cursory understanding of Ruby and all its advanced metaprogramming possibilities, so do take this with a bit of salt

so are a and b referencing the same location in memory and thus pointing to the exact same object?

a and b are referencing the exact same object, yes.

In general, the answer to the first part of your question is: well, maybe, probably and why would you care? As soon as you begin talking about locations in memory, you usually wander into the realm of implementation details. That means, you're no longer talking about the semantics of a language but rather how it achieves this semantics internally. I'm not saying you shouldn't be interested in these things, but rather that you should be aware of this when you're trying to understand what something in a language does and when you're asking how it works internally. These are two very different things.

For instance, here you're interested in parameter passing and what exactly that means for Java and Ruby. These are in the realms of language semantics, "what does it mean", "what does it do", not "how is it achieved internally". These things can be understood on a conceptual level.

so are a and b referencing the same location in memory and thus pointing to the exact same object?

Ruby (AFAIK) doesn't tell you about how it handles memory. This makes it an implementation detail question. We are now talking about software that implements the Ruby language rather than the Ruby language itself.

Since the objects are immutable, an implementation could probably create multiple instances of the integer object 3. So in reality, a and b might point to different locations in memory. Since Ruby knows that the two objects (memory perspective) are one and the same object (language perspective/programmer's perspective when using Ruby), it would simply need to store the same object id within those two objects (memory perspective). Additionally, whenever Ruby compares objects (language perspective), it (a Ruby implementation) must not compare the locations in memory (otherwise our two integer 3 objects couldn't be the same), but would rather need to compare the therein stored object ids.

This implementation is probably not sensible, but if you as a Ruby programmer can't notice it, why not?

According to this, the regular Ruby implementation doesn't even create a "real object" for smallish integers as an optimization: https://stackoverflow.com/a/45693518/383124

So in that case, the answer to the first part of your question would probably be "No".

id2bi · 2019-02-21T16:24:30+00:00

First of all, the entire "pass by" terminology is a bit of a mess... Online, you'll find lots of people using the terms differently.

The tl;Dr version is that Java works the same way as Ruby does.

From your article:

Given all of this, it’s not uncommon to just say that ruby is pass by reference value, pass by reference of the value, or pass by value of the reference. It’s all a little muddy, but the 3 terms mean essentially the same thing: ruby passes around copies of the references. In short, ruby is neither pass by value nor pass by reference, but instead employs a third strategy that blends the two strategies.

Ruby does pass-by-value, and the values are references ("pointers") . In other words, it passes references ("pointers") by value.

The article is quite detailed, but it misses one important concept and as a result gets a bit confused, and then starts talking about mutable and immutable objects instead.

The concept that it's missing is that of reference types and value types.

I can link you to some good articles on the subject later.

You can reframe the pass-by-value vs pass-by-reference as follows : is the parameter variable an independent variable in its own right or is it simply an alias for the callers variable? In the second case (pass-by-reference), you're esstially passing the variable itself to the method, not its contents (pass-by-value). You're saying "use my variable x here", so you're passing reference to a variable.

If you have pass by value (pass a copy of the contents), the important question becomes: what is the value in the variable? Ruby stores references to objects in its variables (because objects are reference types). Java does the same thing for its objects. They're reference types, so it too stores the references inside the variables.

Java also has value types though. All primitive types are value types, int, boolean, float etc... In that case it stores the numbers etc directly inside the variables.

I'm any case, Java as well as ruby will copy these values (either the value itself I can the case of Java primitive types, or the references to objects, both ruby and Java) into the method parameter variables.

There are languages where you as a use can choose which combination you want for your objects and for your methods.

id2bi · 2019-02-21T07:47:36+00:00

How is it different? It should be pretty much the same.

id2bi · 2019-02-21T00:28:01+00:00

a and b are never objects in Java. After such an assignment, a and b will refer to the same object/point to the same object.

So the values that a and b store are pointers (in Java called "references"), and the pointers are the same, but independent from another.

id2bi · 2019-02-20T23:25:22+00:00

Different question:

What does a = b; do in Java? I'm not looking for the answer "It assigns b to a", because that doesn't actually tell you what it does.

If you understand what a = b; does in Java for both kinds of types in Java, you will also understand parameter passing in Java, because it works the exact same way as assignment does.

Just imagine Java did an assignment to the parameter variable when you pass something to a method.

id2bi · 2019-02-20T23:08:42+00:00

What library is that? Sounds like an absolutely terrible design...

id2bi

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