Recent questions tagged Syntax

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syntax - Regex: Get Filename Without Extension in One Shot?

I want to get just the filename using regex, so I've been trying simple things like ([^.]*) which of ... comes up at Geek cocktail parties. See Question&Answers more detail:os...

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

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744 views

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syntax error - JavaScript: SyntaxError: missing ) after argument list

I am getting the error: SyntaxError: missing ) after argument list With this javascript: var nav = document. ... What does this error mean? See Question&Answers more detail:os...

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

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syntax - C#: Abstract classes need to implement interfaces?

My test code in C#: namespace DSnA { public abstract class Test : IComparable { } } Results in the ... be compulsory for concrete classes? See Question&Answers more detail:os...

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

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583 views

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syntax - What's the difference between 'int?' and 'int' in C#?

I am 90% sure I saw this answer on stackoverflow before, in fact I had never seen the "int?" syntax before ... fu is apparently too low.... See Question&Answers more detail:os...

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

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733 views

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syntax - What are those pipe symbols for in Ruby?

What are the pipe symbols for in Ruby? I'm learning Ruby and RoR, coming from a PHP and Java background, ... these pipe symbols in PHP/Java? See Question&Answers more detail:os...

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

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958 views

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syntax - What is the use of <<<EOD in PHP?

I am implementing node to PDF using Drupal and tcpdf. In such case I am suppose to use this <<<EOD tag. If I don't ... <td>TEST</td> </tr> EOD; See Question&Answers more detail:os...

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

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501 views

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syntax - In Java, should variables be declared at the top of a function, or as they're needed?

I'm cleaning up Java code for someone who starts their functions by declaring all variables up top, and initializing ... way of doing it is? See Question&Answers more detail:os...

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

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481 views

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syntax - C++ strings: [] vs. *

Been thinking, what's the difference between declaring a variable with [] or * ? The way I see it: char * ... except in some special cases? Ty See Question&Answers more detail:os...

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

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639 views

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syntax - Modifier Keyword order in Java

Every time I write method in Java with more keywords than public void, every time I write it another way. ... /protected] [result_type] ??? See Question&Answers more detail:os...

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

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865 views

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syntax - C++ array initialization

is this form of intializing an array to all 0s char myarray[ARRAY_SIZE] = {0} supported by all compilers? ... myBoolArray[ARRAY_SIZE] = {false} See Question&Answers more detail:os...

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

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515 views

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syntax - What do >> and << mean in Python?

I notice that I can do things like 2 << 5 to get 64 and 1000 >> 2 to get 250. Also I can use >> ... >obj, "Hello world" What is happening here? See Question&Answers more detail:os...

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

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777 views

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syntax highlighting - SublimeText encloses lines in white rectangles

It's rather annoying and I can't seem to figure out why. See Question&Answers more detail:os...

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

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572 views

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syntax - When do Ruby instance variables get set?

class Hello @hello = "hello" def display puts @hello end end h = Hello.new h.display I created the class above. ... the correct way to do this? See Question&Answers more detail:os...

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

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708 views

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syntax - How do I pass multiple parameters in Objective-C?

I have read several of the post about Objective-C method syntax but I guess I don't understand ... forTime:(NSTimeInterval *)timeInterval See Question&Answers more detail:os...

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

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648 views

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syntax - List of Scala's "magic" functions

Where can I find a list of Scala's "magic" functions, such as apply, unapply, update, +=, etc.? By ... , but in which magic functions exists. See Question&Answers more detail:os...

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

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908 views

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syntax - What does the underscore mean in this case?

my code before the migation to Swift 2.0: override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) { ... = standing for :-( See Question&Answers more detail:os...

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

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695 views

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syntax - In Perl, what is the difference between accessing an array element using @a[$i] as opposed to using $a[$i]?

Basic syntax tutorials I followed do not make this clear: Is there any practical/philosophical/context-dependent/tricky ... same in both cases. See Question&Answers more detail:os...

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

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775 views

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syntax - Why does white-space affect ruby function calls?

I get a syntax error with this code render json: { "what" => "created", "whatCreated" => "thing" ... after render_to_string breaks my rails app? See Question&Answers more detail:os...

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

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802 views

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syntax - Add a prefix to all rows in R

I am trying to add a prefix end to all rows in a col ensnp in a dataframe chrs: Name endsnp Bov001 Bov001 ... ideas about my error? Thank you! See Question&Answers more detail:os...

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

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753 views

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syntax - Error with varargs for function-objects in Scala?

Why does this not work? val f = (args: Int*) => args.sum error: ')' expected but identifier found. val f = ( ... sum btw. I'm using scala 2.9.1 See Question&Answers more detail:os...

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

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986 views

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syntax - Python: SyntaxError: keyword can't be an expression

In a Python script I call a function from rpy2, but I get this error: #using an R module res = ... expression What exactly went wrong here? See Question&Answers more detail:os...

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

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749 views

1 answer

syntax - In R, what does a negative index do?

I am porting part of a program (not enough to compile and run) from R to C++. I am not familiar with R. I ... I have no idea what -1 refers to. See Question&Answers more detail:os...

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

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633 views

1 answer

syntax - My java code has an obvious error. Why does it compile and run?

public class HelloWorld { public static void main (String args[]){ System.out.println ("Hello "); http:// ... is not reporting any error? See Question&Answers more detail:os...

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

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811 views

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syntax - How do you print a dollar sign $ in Dart

I need to actually print a Dollar sign in Dart, ahead of a variable. For example: void main() { int dollars=42; ... . How can I do this? Thanks. See Question&Answers more detail:os...

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

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751 views

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syntax - Weak typing in PHP: why use isset at all?

It seems like my code works to check for null if I do if ($tx) or if (isset($tx)) why would I do the second one when it's harder to write? See Question&Answers more detail:os...

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

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1.0k views

1 answer

syntax - What does ‘::’ (double colon) do in JavaScript?

The documentation of some JavaScript APIs shows the following snippets as an example of how to invoke some ... a single string argument. See Question&Answers more detail:os...

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

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683 views

1 answer

syntax - What does += mean in Python?

I see code like this for example in Python: if cnt > 0 and len(aStr) > 1: while cnt > 0: aStr = aStr[1:]+aStr[0] cnt += 1 What does the += mean? See Question&Answers more detail:os...

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

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598 views

1 answer

syntax - Is it correct to use single quotes for HTML attributes?

Recently I've been seeing a lot of this: <a href='http://widget-site-example.com/example.html'> <img ... because you have to escape apostrophes. See Question&Answers more detail:os...

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

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