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rust - How do I stop iteration and return an error when Iterator::map returns a Result::Err?

I have a function that returns a Result: fn find(id: &Id) -> Result<Item, ItemError> { // ... } Then ... existing error). How do I best handle this in Rust? Question&Answers:os...

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

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What is a simple explanation for how pipes work in Bash?

I often use pipes in Bash, e.g.: dmesg | less Although I know what this outputs, it takes dmesg and ... pipes consistent everywhere it appears in a Bash script? Question&Answers:os...

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

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c# - How to embed a text file in a .NET assembly?

I would like to embed a text file in an assembly so that I can load the text without having to read it ... do you programaticaly load the text into a string? Question&Answers:os...

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

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How to pause for specific amount of time? (Excel/VBA)

I have an Excel worksheet that has the following macro. I'd like to loop it every second but danged if I can ... I want to wait for one second Loop End Sub Question&Answers:os...

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

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ios - Overriding method with selector 'touchesBegan:withEvent:' has incompatible type '(NSSet, UIEvent) -> ()'

Xcode 6.3. Within a class implementing UITextFieldDelegate protocol, I would like to override touchesBegan() ... Cannot specialize non-generic type 'NSSet' Question&Answers:os...

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

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173 views

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javascript - Stop setInterval

I want to stop this interval in the error handler from running repeatedly. Is that possible, and if so, how? // example ... / I want to stop it here } }); } Question&Answers:os...

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

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c# - Difference between Console.Read() and Console.ReadLine()?

I'm new to this field and I'm very confused: what is the real difference between Console.Read() and Console.ReadLine()? Question&Answers:os...

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

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c# - How to abort a Task like aborting a Thread (Thread.Abort method)?

We could abort a Thread like this: Thread thread = new Thread(SomeMethod); . . . thread.Abort(); But can ... mechanism. I want to kill the Task immediately. Question&Answers:os...

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

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472 views

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function - PHP echo vs PHP short echo tags

Are they equal in safeness? I was informed that using <?=$function_here?> was less safe, and that it ... to using echo. What are the advantages/disadvantages? Question&Answers:os...

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

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Java generating non-repeating random numbers

I want to create a set of random numbers without duplicates in Java. For example I have an array to store 10, ... I make sure the random numbers do not repeat? Question&Answers:os...

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

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python - Confused about backslashes in regular expressions

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

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240 views

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matlab - Create variables with names from strings

Let's assume that I want to create 10 variables which would look like this: x1 = 1; x2 = 2; x3 = 3; x4 ... cant find a way to create a variable with that name. Question&Answers:os...

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

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281 views

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c - Does stack grow upward or downward?

I have this piece of code in c: int q = 10; int s = 5; int a[3]; printf("Address of a: %d ", ( ... . I am curious on how stack works. Thanks for any help. Question&Answers:os...

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

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python - Get month name from number

How can I get the month name from the month number? For instance, if I have 3, I want to return march date.tm_month() How to get the string march? Question&Answers:os...

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

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audio - Play a Sound with Python

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

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99 views

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javascript - CORS - How do 'preflight' an httprequest?

I am trying to make a cross domain HTTP request to WCF service (that I own). I have read several techniques ... at the client to preflight my request? Thanks! Question&Answers:os...

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

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307 views

1 answer

ASP.Net MVC How to pass data from view to controller

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Question&Answers:os...

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

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136 views

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c# - still confused about covariance and contravariance & in/out

ok i read a bit on this topic on stackoverflow, watched this & this, but still a bit confused about co ... this question has been asked but still very confused. Question&Answers:os...

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

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How do I pass an object from one activity to another on Android?

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

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378 views

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audio - Cross-platform, cross-browser way to play sound from Javascript?

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

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366 views

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linux - Environment variable substitution in sed

If I run these commands from a script: #my.sh PWD=bla sed 's/xxx/'$PWD'/' ... $ ./my.sh xxx bla ... as an environment variable as it is defined in the shell? Question&Answers:os...

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

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101 views

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How to write a JSON file in C#?

I need to write the following data into a text file using JSON format in C#. The brackets are important for it to ... ; } public string Message { get; set;} } Question&Answers:os...

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

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735 views

1 answer

boolean - PHP - Get bool to echo false when false

The following code doesn't print out anything: $bool_val = (bool)false; echo $bool_val; But the following code ... is false than adding an if statement? Question&Answers:os...

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

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138 views

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iphone - Pass data back to previous viewcontroller

I am trying to pass data BACK TO previous viewController. Does anyone know how to pass data back from ... [delegate sendDataToA:@"Apple"]; } @end Question&Answers:os...

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

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124 views

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HTML colspan in CSS

I'm trying to construct a layout similar to the following: +---+---+---+ | | | | +---+---+---+ ... , I cannot use <table> tags. Is this possible using CSS? Question&Answers:os...

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

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222 views

1 answer

database - IN vs OR in the SQL WHERE Clause

When dealing with big databases, which performs better, IN or OR in the SQL Where-clause? Is there any difference about the way they are executed? Question&Answers:os...

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

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1.5k views

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convert base64 to image in javascript/jquery

I have written some code for image capturing using javascript/jquery Below is the code: function capture_image(){ ... code is not suitable for my requirement. Question&Answers:os...

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

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220 views

1 answer

c# - Parse v. TryParse

What is the difference between Parse() and TryParse()? int number = int.Parse(textBoxNumber.Text); // The Try ... form of error-checking like a Try-Catch Block? Question&Answers:os...

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

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