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What is the !! (not not) operator in JavaScript?

I saw some code that seems to use an operator I don't recognize, in the form of two exclamation points, like so ... !== undefined ? !!vertical : this.vertical; Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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996 views

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text - Split large string

I have a long text which needs to be converted to small strings so I can include it to an AutoIt script. If I ... . How can I split it with & _ -delimiters? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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syntax error - Lisp, instructions not working in defun

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to return the response from an asynchronous call

I have a function foo which makes an asynchronous request. How can I return the response/result from foo? I am ... result; // It always returns `undefined` } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What's a quick way to comment/uncomment lines in Vim?

I have a Ruby code file open in vi, there are lines commented out with #: class Search < ActiveRecord::Migration def ... could be JavaScript (//) or Haml (-#). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git - How to compare files from two different branches

I have a script that works fine in one branch and is broken in another. I want to look at the two ... like git diff mybranch/myfile.cs master/myfile.cs Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git - How to link a folder with an existing Heroku app

I have an existing Rails app on GitHub and deployed on Heroku. I'm trying to set up a new development ... time since it will create another Heroku instance. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby - Using Sinatra for larger projects via multiple files

It seems that in Sinatra all route handlers are being written into a single file, if I understand right it acts ... - similar logic that is applied in PHP? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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git - Clone only one branch

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Using pointer after free()

During my tests, I have found that it is possible to use pointer after free(). I have the following code: ... to pointer? Why there is not segmentation fault? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

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Flatten a list in Prolog

I've only been working with Prolog for a couple days. I understand some things but this is really confusing me ... feel like I'm missing something very simple. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How to decode a Unicode character in a string

How do I decode this string 'Schu00f6nen' (@"Schu00f6nen") in C#, I've tried HttpUtility but it doesn't give me the results I need, which is "Sch?nen". Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jsf - Specify conditional rendering of element inside <ui:repeat>? The <c:if> does not seem to work

I am trying to conditionally build a custom list using <ui:repeat>. On every occurrence of -1 as item-value in list, ... > </ui:repeat> </ul> Is this possible? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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323 views

1 answer

javascript - JSF/PrimeFaces ajax updates breaks jQuery event listener function bindings

I am registering a change event listener for every input in the HTML using jQuery as below: <h:head ... event without rerunning document ready script again. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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string - Deleting reversed duplicates with R

I have a data frame in R that contains the gene ids of paralogous genes in Arabidopsis, looking something like this: ... Any ideas in how to remove these rows? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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414 views

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grand central dispatch - CFRunLoop in Swift Command Line Program

I am writing a command line application in Swift using a third-party framework that (if I understand the ... implement a CFRunLoop for the main thread? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.3k views

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powershell - Convert nested JSON array into separate columns in CSV file

I have a JSON file that looks like this: { "id": 10011, "title": "Test procedure", "slug": "slug", ... like area_1, area_2 etc. And the same for disciplines. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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937 views

1 answer

replace - Is there an efficient way to perform hundreds of text substitutions in Ruby?

I'm trying to use a list of hundreds of common misspellings to clean some input before searching for ... perform hundreds of text substitutions in Ruby? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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125 views

1 answer

c - Need of Pointer to pointer

What is necessary for storing the address of a pointer? int a = 2; int *p = &a; int **q = &p; Any practical use? Real time applications. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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316 views

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c - Syscall implementation of exit()

I wrote a simple C program which just calls the exit() function, however strace says that the binary is ... the compiler choose exit_group() over exit()? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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91 views

1 answer

Javascript string array to object

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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881 views

1 answer

winforms - MSI register dll - Self-Registration considered harmful

I have a .NET winform application that requires to register a native dll during installation. My question is how ... a dll as part of un-installation process? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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268 views

1 answer

python - Is there a difference between QFileDialog strings in PyQt4 and PyQt5?

I have a block of code that opens a QFileDialog using Python3 and PyQt5: from PyQt5.QtWidgets import QApplication, ... would cause an issue like this. Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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329 views

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c - scanf getchar function is skipped

A very simple question. Why scanf is skipped in the first while loop. I have tried it by using getchar() and ... ; newnode->next = NULL; return newnode; } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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487 views

1 answer

javascript - Sequelize model association won't create a new column

Why is it that in some of my models, sequelize WON'T create a new column for foreignkey? BUT it does ... instead of adding it through the associate function. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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221 views

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python - Display the output of the program on GUI with tkinter?

I would like to display my program's "live" output on GUI (all what printed in it). how can i access to my ... padx=20, pady=18) output.pack() Master.mainloop() Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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509 views

1 answer

rust - Change enum variant while moving the field to the new variant

I want to update an enum variant while moving a field of the old variant to the new one without any cloning: ... to move one field from one variant to another. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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417 views

1 answer

Make sure that you use the correct version of 'pip' installed for your Python interpreter located at 'dir:projectPathvenvScriptspython.exe'

I am using python 3.6.5 with PyCharm. While trying to install any package, it gives the error "Try to run this command ... pip version is 9.0.3 What do I do? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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