Все вопросы: [syntax]
696 вопросов
How does ScalaTest syntax work?
I've done some programming in Scala, and I know that, e.g., xs map f is the same thing as xs.map(f) but I have no idea how to generalize this syntax to something like ScalaTest's syntax, e.g., it should "throw NoSuchElementException if an empty stack is popped" in { val emptyStack = new ...
PHP $_ENV where are they stored
I've compiled my own PHP / apache setup on our dev box at work. However the $_ENV['SERVER_Name']; isn't showing anything. Why is this?
Tool to help write Excel formulas and IF statements?
This is an Excel formula with nested IF statements: =IF((B2="East"),4,IF((B2="West"),3,IF((B2="North"),2,IF((B2="South"),1,"")))) To essentially accomplish this: If cell B2 = "East" return "4" ElseIf cell B2 = "West" return "3" ElseIf cell B2 = "North" return "2" ElseIf cell B2 = ...
C++ const keyword - use liberally?
In the following C++ functions: void MyFunction(int age, House &purchased_house) { ... } void MyFunction(const int age, House &purchased_house) { ... } Which is better? In both, 'age' is passed by value. I am wondering if the 'const' keyword is necessary: It seems redundant ...
Anonymous Scala function syntax
I'm learning more about Scala, and I'm having a little trouble understanding the example of anonymous functions in http://www.scala-lang.org/node/135. I've copied the entire code block below: object CurryTest extends Application { def filter(xs: List[Int], p: Int => Boolean): List[Int] = ...
JavaScript Whitespace Syntax Error
Why does this cause a syntax error for the return statement: var FOO = (function($) { return { init: function() { } } })(jQuery); Whereas this doesn't: var FOO = (function($) { return { init: function() { } } })...
How to enclose values in SQL commands?
An error-free column name syntax is [My Column] instead of My Column which causes an error. An error-free string value syntax is '25,00' instead of 25,00 which causes an error. I'm getting an error using single quotes to enclose values, if the column data type is numeric. Are there any other wa...
How do I search set of keywords from keywords field in Solr?
So I have a keyword field with this schema Indexed, Tokenized, Multivalued, TermVector Stored, Omit Norms then I wanna search set of keywords against it like q=keyword:keyword1, keyword2, keyword3, etc, etc and want to return most matching keywords, even 1 match keyword is fine, but ordered by...
Possible syntax for multi-type catch blocks in C#?
Here are two previous questions regarding this topic: Catch multiple Exceptions at once? More Elegant Exception Handling Than Multiple Catch Blocks? I was working today and thought this might be an appropriate syntax should this feature ever be added to the C# language. Anyone have any opinio...
Ruby methods equivalent of "if a in list" in python?
In python I can use this to check if the element in list a: >>> a = range(10) >>> 5 in a True >>> 16 in a False How this can be done in Ruby?
How to refer to a static constant member variable in PHP
I have a class with member variables. What is the syntax in PHP to access the member variables from within the class when the class is being called from a static context? Basically I want to call a class method (but not create a new object), but when the class method is called, I want a handful...
How to write an empty indentation block in Python?
The runtime keeps telling me: expected an indented block But I don't want write nothing inside my except block, I just want it to catch and swallow the exception.
Can I avoid rewriting a table expression in an update?
Suppose you're updating a table that is the result of an expression, like so UPDATE OPENQUERY( server, 'SELECT a from b' ) SET rem.a = loc.a FROM OPENQUERY( server, 'SELECT a from b' ) rem ,local_table loc WHERE rem.id = loc.id Will that OPENQUERY be executed once, or twice? I bel...
Ruby - test for array
What is the right way to: is_array("something") # => false (or 1) is_array(["something", "else"]) # => true (or > 1) or to get the count of items in it?
PHP echo question?
Do I really need this many echo's or can I make it shorter? <?php if (!empty($url)) { echo '<p>Job: <span>' . $job .'</span></p>'; echo '<p>Skills: <span class="caps">' . $skills . '</span></p>'; echo '<p>Website: <a href="h...
Jquery GET - sending & recieving long, complex content, how to?
I have a review PAGE with a TEXTFIELD. User need to be able to write LONG STORY (1000 words+) may contain chars like ()*&^%$#@\/<> Once "save" is pressed I want to use Jquery GET -> to process content with PHP file. (save in mysql database) and return result. let's say I want to ...
How to indicate when purposely ignoring a return value
In some situations using C/C++, I can syntactically indicate to the compiler that a return value is purposely ignored: int SomeOperation() { // Do the operation return report_id; } int main() { // We execute the operation, but in this particular context we // have no use of the...
Correct PHP Session and variable syntax
The following syntax is incorrect: $_session['page'$numberpages]=$CurrentPage; What is the correct 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 function: <button type="button" onClick="foo.DoIt(72930)">Click</button> <button type="button" onClick="foo.DoIt(42342::37438)">Click</button> :: is obviously use...
what is the difference between a syntax and s-expressions
what is the main differences between syntax language and s-expressions language ? does using s-expressions affects compiling time (in the parsing process) or does it bring any advantage to the language ?
How do you escape a reserved word in Delphi?
I need to Escape a reserved word to use it as an identifier in Delphi. I thought that was accomplished by using the ampersand "&", but that doesn't seem to be working right. Any other suggestions?
LINQ: dot notation equivalent for JOIN
Consider this LINQ expression written using query notation: List<Person> pr = (from p in db.Persons join e in db.PersonExceptions on p.ID equals e.PersonID where e.CreatedOn >= fromDate orderby e.Create...
Java Syntax: Shortcuts in Method Declarations?
Quickie pseudo-aesthetics question: For field declarations, the following is allowed: int i, j, k; providing three variables for integers. Does anything similar exist for method declarations, ala: public int getI() {/* ... */}, getJ() {/* ... */}, getK() {/* ... */}; so that the method ac...
Best way to split string into lines
How do you split multi-line string into lines? I know this way var result = input.Split("\n\r".ToCharArray(), StringSplitOptions.RemoveEmptyEntries); looks a bit ugly and loses empty lines. Is there a better solution?
Best syntax to create multi-line string
What's the best way to create multi-line string in C#? I know the following methods: Using StringBuilder var result = new StringBuilder().AppendLine("one").AppenLine("two").ToString() looks too verbose. Using @ var result = @"one two" looks ugly and badly formatted. Do you know be...
What's the difference between "LIKE" and "=" in SQL?
Is there any difference between: SELECT * FROM users WHERE username="davyjones" and SELECT * FROM users WHERE username LIKE "davyjones" (I think I've bungled up the syntax... pardon me for that, I'm mostly a desktop app development guy)
php : echo"", print(), printf()
Is there a better way to output data to html page with PHP? If I like to make a div with some var in php, I will write something like that print ('<div>'.$var.'</div>'); or echo "'<div>'.$var.'</div>'"; What is the proper way to do that? Or a better way, fill a $te...
Abbreviation for PHP's array()
I don't know how about you, but I'm not very fond of the way arrays are constructed in PHP. I have this feeling that I use array keyword way too often and that array($k => $v) or e.g. array($k1=>array($k2=>$v)) are way too long given usefulness of maps. (Moreover, recently I've learned J...
WITH statement in Java
In VB.NET there is the WITH command that lets you omit an object name and only access the methods and properties needed. For example: With foo .bar() .reset(true) myVar = .getName() End With Is there any such syntax within Java? Thanks!
Compiler Design
Is newline and whitespaces the same in compiler design? what if you write a macro to replace newlines by whitespaces, is this correct or would it cause some form of problems?