Bark | A better Arc / Rc
kandi X-RAY | Bark Summary
kandi X-RAY | Bark Summary
Bark is a pointer type for reference-counted data similar to Arc or Rc. Unlike Arc, Bark only uses atomic operations when crossing threads, or when all Barks on a thread are gone.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Bark
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Community Discussions
Trending Discussions on Bark
QUESTION
I've recently been finding a ton of value in simplifying branching logic into switch expressions and utilizing pattern matching. Particulary in the case where I have multiple data elements that need to be considered.
...ANSWER
Answered 2022-Mar-09 at 21:19I'm not sure if you're looking for some kind of code-generation, but with a bit of Linq aggregation you can put your patterns/records in a sequence and use the result as a function that kinda acts like the switch-expression pattern matching. It's important that dataRecords contains the records in the order you want them to be evaluated:
QUESTION
I would like to know how can one pull data with VBA from one sheet to the other 3 sheets based on the value one column has.
For Example.
You have 4 Sheets. Tree1, Tree2, Tree3, Data
Tree1, Tree2, and Tree3 have different columns of data. Sheet 4 which is called data has different columns of data but the 1 column's values are "TreeOne", "TreeTwo", and "TreeThree".
I would like to formula to pull from the datasheet each respective tree's data based on that one column from the Datasheet.
...ANSWER
Answered 2022-Jan-31 at 19:22AutoFilter)
QUESTION
There isn't a Genera topic on stackoverflow, but I thought I'd take the chance that one of the (probably) 5 people in the world using it might be here; no harm in trying.
I've run into the situation where a few of the systems I'm working with use pretty printing, which is not implemented on Genera. I've managed to work around the problem in my own system by using the predecessor of pretty printing, XP. Looking at the code in xp-code.lisp and comparing it to that in CCL, it's clear where CCL got its pretty printing functions from.
One solution, now proving inadequate, is to have a top-level eval that does an (xp::install :package my-package) and resume from the redefinition warnings. The problem is that when one of the third-party systems is compiled, they too complain about pretty printing features that are not implemented, so I'd have to install XP in each of these other packages that want pretty printing.
What really needs to happen is for XP to be installed in the common-lisp package, because all of these other systems are going to :use :cl and expect to have a fully functional pretty printing system.
That's not so easy though; the CL package is locked and each XP symbol requires multiple confirms, and a type 'yes', to get it into the CL package. The documentation for External-only Packages and Locking suggests that:
To set up an external-only package, it can be temporarily unlocked and then the desired set of symbols interned in it
but no where does it say how to unlock a package, and the Document Examiner isn't turning up much.
I also have to stop and wonder if I'm barking up the wrong tree. XP was written with Genera in mind, and there are conditionalisations in the code for the platform. It shouldn't be so hard to install using the install function; and I wonder if I'm missing something obvious.
Does anyone out there know how to unlock the CL package, or the proper way install XP in Genera? The included instructions for XP appear to be out of date.
ANSWER
Answered 2022-Feb-22 at 10:55I figured it out:
QUESTION
I have some related classes that implement the same method
...ANSWER
Answered 2022-Feb-19 at 04:38Here are some ideas.
QUESTION
I know that in order to bind a property to a function you need to add that to its prototype. For example:
...ANSWER
Answered 2022-Feb-05 at 04:30Objects in JavaScript use prototypal inheritance. Every object inherits from some other object, or from null. This chain continues - all objects eventually inherit from null.
If an object inherits from another, all of the properties available on the parent object will be available on the child object (unless the child object defines a property with the same name, effectively shadowing and hiding the name on the parent).
If instances of Animal inherited from Animal itself, like with
QUESTION
I'm trying to create an AnimalFactory that returns generic factories for making different types of Animals, depending on the arguments passed to the AnimalFactory.
Here's the code:
...ANSWER
Answered 2022-Jan-26 at 21:33The return value of the function is AnimalMaker and not AnimalMaker because that’s what you declared as the return type. The variable maker is indeed an AnimalMaker but that isn’t a match for what the function is supposed to return because T could be a subtype of Animal.
You declared your function as having a generic type of T: Animal. Generic types are always an input to the function. In this case, it doesn’t make sense to use a generic input to the function because there’s no way to enforce that the type given is a match for the input String it corresponds with. To make your function work, you can remove and declare that it returns AnimalMaker.
A little more explanation. There are two reasons why you might want to use generics in a function signature.
- Enforce input parameter types.
- Determine the output type.
You might use generics for one or both reasons (but the second can only be done by itself in a useful way by using reified generics, except in very specific cases where the returned class won’t be producing anything).
In your case, your input generic is not used to enforce the input parameter since that is just a String. To use it for the second reason, you would have to cast your return value’s type to the unknown (to the compiler) type T which would be unsafe because there’s no way to know if the input type given at the call site is a valid match for the given input String. And if you expected the call site to pass the right type, it would be redundant and error prone to also require a matching String to be passed.
Edit:
If you know the input type at compile time, then you can do this with reified generics. Get rid of the String input. It would look like this:
QUESTION
I am trying to remove three sentences from paragraphs of text data. I have a pandas dataframe with rows of paragraphs that I want to remove the same three sentences from. For example,
...ANSWER
Answered 2022-Jan-18 at 14:49pandas.Series.str.replace has a default keyword argument of regex=True which means it assumes the replacements are regular expressions (like your "installation(s)" could be interpreted). You're trying to replace string literals (or non-regular expressions at the very least). Adding regex=False should work fine:
QUESTION
Are the two defining methods pretty much the same? Is there anything I should watch out for?
...ANSWER
Answered 2022-Jan-17 at 17:29A js class is a beautified way of writing your first bit of code. So yes these two syntaxes do exactly the same thing.
QUESTION
I have only started using Apps Script for a few months and usually I can figure out why it's giving me error messages. But this latest one has me completely stumped and I cannot find anyone who has asked anything similar on here.
I have very simple code which retrieves data from a spreadsheet, loops through it to remove some values before pasting it back into another sheet. However, the loop keeps throwing up the error "TypeError: Cannot read property '0' of undefined".
After some digging I think I found the issue - the array I have extracted from the sheet is 3 rows short of what it should be.
So var refArray = sheet.getRange("F5:F").getValues(); has the length 65 even though there are 68 rows in the sheet.
But what really puzzles me is that when I run var len = refArray.length it returns 68! So, for lack of better lingo, this confuses my loop as it cannot find the last 3 items and I get the above error (at least that's what I think).
I have tried extracting the data using
var refArray = sheet.getRange(1,6,sheet.getMaxRows(),1) but this also just skips over the last 3 rows. There is no particular reason it would skip these rows, and sometimes it only skips 2, so I don't think the issue lies within my data...
I can share a mock-up of my sheet and script if it helps, I have no clue why it is doing this or how to fix it!
Thanks already everyone.
EDIT
I may have been barking up the wrong tree as I just tried to replicate the issue in another sheet and the array seemed to be extracted correctly, but then the error popped up again when it started to loop. As I said I'm just dabbling in Apps Script so my loops are very basic. I'm just gonna add the full sequence below and see if someone can spot the error:
...ANSWER
Answered 2022-Jan-13 at 17:48I'd propose to use array.includes() method and create a new array instead of change existed one:
With a loop:
QUESTION
First occasion experimenting with dates and times in MongoDB.
Currently, I have correctly inserted UTC dates into my documents:
...ANSWER
Answered 2022-Jan-02 at 18:33You can try $expr expression operator to use aggregation operators ($hour) in query,
$exprto use aggregation operators$hourwill return an hour from the date$eqto match hour and input hour 8
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