map with class value segmentation fault
Your program exhibits undefined behavior since the member variables size, tail, and head of dlist are not initialized before being used. Use dlist() : dlist(0) {} dlist(int capacity) : cap(capacity), size(0), tail(nullptr), head(nullptr) {} That fixes the segmentation violation problem in my testing. I recommend adding a constructor to node...
Python iterative loop
There seems to be no need to use enumerate here. Just iterate over strings directly: for s in strings: if findWholeWord(s)(line) != None: print (jd['user_id'], jd['text']) break If you also need the index variable n, then use enumerate: for n, s in enumerate(strings): if findWholeWord(s)(line) != None: # do something...
Error when summing variable and number inside brackets NoMethodError
IMHO this line of code causes problem if nums[i] + nums[b] == 0 in case when nums = [1, 2, 3] so length is 3; when i = 2 then b = 3. When b = 3 then nums[b] (nums[3]) is nil. possible solution def two_sum(nums) i = 0 while...
How to access javascript object without “name”
you can access for empty string as a key and remember that is a array inside, use the item 0 obj[''][0].id ...
why there is a “SyntaxError: invalid syntax”
This line: sendmail("xd73_RS: " + err.args + " " + str(time.time()) Has unmatched parentheses. Generally if the syntax error occurs on line n, its a good idea to check the syntax on line n-1....
Javascript for loop without recalculating array's length
javascript,arrays,loops,for-loop,syntax
You can chain variable declarations like this var i = 0, foo="bar", hello = "world" Which is close to the same thing as var i = 0; var foo = "bar"; var hello = "world"; So this for(var i = 0, len = keys.length; i < len; i++) Is the...
ORA-00939: too many arguments for function in CASE Statement
sql,oracle,syntax,arguments,substr
SUBSTR(fridge_door_modela_id, 0, INSTR(fridge_door_modela_id, 'EXCR'),1) The above syntax for SUBSTR is incorrect. The correct syntax is: SUBSTR( string, start_position [, length ] ) Also, the index of substr starts from 1 and not 0. Executing it in SQL*Plus shows the exact error clearly, see the following error: SQL> WITH DATA...
Java syntax to Groovy syntax
The following should work: import java.security.cert.* import javax.net.ssl.* TrustManager[] trustAllCerts = [ [ getAcceptedIssuers: { -> null }, checkClientTrusted: { X509Certificate[] certs, String authType -> }, checkServerTrusted: { X509Certificate[] certs, String authType -> } ] as X509TrustManager ] ...
Double dollar variables with arrays
You were very close. You need to tell PHP to evaluate the $a alone. Try: <?php $a = 'test'; $test = ['a', 'b']; echo ${$a}[0]; Example...
Reading binary file to a string but the types are mixed
As @chux said, the \x that VS is displaying to you is an inseparable part of the char representations that VS is presenting to you. It is trying to be helpful by providing a form that can be used directly in C source code as a char literal. For example,...
Getting four bits from the right only in a byte using bit shift operations
c,syntax,bit-manipulation,bitwise-operators
Shift operator only only works on integral types. Using << causes implicit integral promotion, type casting b to an int and "protecting" the higher bits. To solve, use temp = ((unsigned char)(b << 4)) >> 4;...
How to DROP DATABASE named “/”
mysql,database,syntax,drop-database
You need backticks: DROP DATABASE `/`; ...
Does “Text” in the HTML5 syntax mean “any character”?
The character restriction for text on your page and in your markup is defined according to your selected character set. If you don't define a character set, the browser will take a guess or assert its default option (usually, whatever is the least restrictive). The character set is defined by...
C# No value given for one or more required parameters
c#,sql,syntax,ms-access-2007,helper
Your column name creditcardNum missing t Command.CommandText = "UPDATE Table1 SET Username='"+textBox10.Text+"' , Email='"+textBox9.Text+"' , FirstName='"+textBox8.Text+ "' , LastName='"+textBox7.Text+"' , CrediCardNum='"+textBox6.Text+"' Where Username='"+m[0]+"'" ; it should be Command.CommandText = "UPDATE Table1 SET Username='"+textBox10.Text+"' , Email='"+textBox9.Text+"' , FirstName='"+textBox8.Text+ "' , LastName='"+textBox7.Text+"' , CreditCardNum='"+textBox6.Text+"' Where Username='"+m[0]+"'" ; Your table definition picture saying...
Simple ruby syntax if statement. Is this possible?
I would use include? to make it more readable: if ([3,5,7].include?a and b == 2 and [5,6].include?c and [8,9,0].include?d) ...
Javascript For Loop with Iterator In the Middle and Decrement Operator to the Left of i?
javascript,for-loop,syntax,decrement
In js, 0 means false, and the other values like 1 are true. why is the iteration statement in the middle for(var i = x; --i; /* optional */ ) ^^ its decrement as well as the condition loop continues until, i is 0 In fact, you can create infinite...
How to differentiate between assigning and declaring values from a function with multiple returns?
In this case you can't use the short variable declarations ":=" for redeclaring the foo variable, according to the spec: Unlike regular variable declarations, a short variable declaration may redeclare variables provided they were originally declared earlier in the same block with the same type, and at least one of...
Objective-C syntax: <>
In your example above, C is a protocol. What you're saying in english terms is: I want a class A that subclasses from class B and also conforms to protocol C. A protocol is similar to an abstract class in other languages and usually defines a set of methods and...
How to access Objective C unnamed parameters of some method?
objective-c,methods,syntax,parameters
The labels are the things before the type. You can omit them (except for the first one, because it is the name of the method). So you are allowed to declare this: - (float) divNum1: (int) a : (int) b; And define it like this: - (float) divNum1: (int) a...
Ruby class instance variables in subclasses
ruby,oop,syntax,class-variables
Class instance variables are not inherited, so the line @serializable_attrs = {} Only sets this in Serializable not its subclasses. While you could use the inherited hook to set this on subclassing or change the serialize method to initialize @serializable_attrs I would probably add def self.serializable_attrs @serializable_attrs ||= {} end...
Need help in understanding this c++ syntax [ const char * what () const throw () ]
It's a member function definition. const char * is the return type, a pointer to a constant character, by convention the first character of a zero-terminated string array. what is the function name () is an empty parameter list, indicating that the function takes no arguments const qualifies the function,...
C structure syntax
C typedef declarations are understood by analogy with variable declarations. int a, *b; declares the values a of type int and b of type int*. typedef int A, *B; declares the type A equivalent to int and the type B equivalent to int*. So, just think about what the variable...
Assigning a value to an object of type AnyObject
Are you sure you don't want to use a PFObject class instead of an AnyObject? var post :PFObject? post?["caption"] = captionTextView.text https://www.parse.com/apps/quickstart#parse_data/mobile/ios/swift/existing...
Why do I get a “MySQLSyntaxErrorException:” error?
DATABASE is a MySQL reserved word. Use a different name for the table
What is the correct way to create a object array in java? [duplicate]
Any of the above are allowed. All produce the same bytecode. JLS-10.2 Array Variables says (in part) The [] may appear as part of the type at the beginning of the declaration, or as part of the declarator for a particular variable, or both. ...
SyntaxError: invalid syntax?
Check the code before the print line for errors. This can be caused by an error in a previous line; for example: def x(): y = [ print "hello" x() This produces the following error: File "E:\Python\test.py", line 14 print "hello" ^ SyntaxError: invalid syntax When clearly the error is...
Regex - the difference in \\n and \n
php,regex,datetime,syntax,sscanf
Like @LucasTrzesniewski pointed out, that's sscanf() syntax, it has nothing to do with Regex. The format is explained in the sprintf() page. In your pattern "%4d%[^\\n]", the two \\ translate to a single backslash character. So the correct interpretation of the "faulty" pattern is: %4d - Get four digits. %[^\\n]...
replace the $ in php variable declaration
php,syntax,bison,abstract-syntax-tree
I was able to solve this issue, Two steps need to be taken: Make PHP not parse '#' as comments: Change: <ST_IN_SCRIPTING>"#"|"//" { To <ST_IN_SCRIPTING>"//" { In line 1901 in zend_language_scanner.l Tokenize #a as a variable: Change: simple_variable: T_VARIABLE { $$ = $1; } | '$' '{' expr '}' {...
EXPLAIN in postgresql not working
sql,postgresql,syntax,syntax-error,explain
It should not work - DDL statements has no plan - so EXPLAIN has nothing to show.
PHP designer 8 Syntax Highlighing
php,syntax,designer,highlighting,phpdesigner
Go to: Tools -> Preferences -> Debugger -> Syntax Check And disable the checkbox "highlight warnings and errors" In this page you'll also find all the other options regarding "syntax check for PHP"...
php syntax error with if and else
Remove endif; When you use curly braces you don't need (and cannot use) endif. This: if (true) { echo 'hello'; } else { echo 'goodbye'; } ...is equivalent to this: if (true): echo 'hello'; else: echo 'goodbye'; endif; You cannot mix the two styles....
What does ** (double asterisk) mean in JavaScript?
Those would both be syntax errors. It is perhaps an attempt to use Markdown style for bold text (i.e. **text** becomes text). StackOverflow uses Markdown in questions, answers, and comments. It is completely unrelated to JavaScript. However, in this case, the action seems to be intended to make that text...
UPDATED - calculating the tuition total
Your main method located at the top of your class: public static void main(String[] args) { Is never closed, you should do something like this: public static void main(String[] args) { } Now your error should be resolved but without something inside your main method your code will probably not...
Swift 2 - Pattern matching in “if”
swift,if-statement,syntax,pattern-matching,swift2
All it really means is that if statements now support pattern matching like switch statements already have. For example, the following is now a valid way of using if/else if/else statements to "switch" over the cases of an enum. enum TestEnum { case One case Two case Three } let...
Is this Swift syntax efficient?
It fires everytime the getter is called. No way this could be optimized away. You might want to keep a preset colors array in sync with the photos property, i.e. change it directly when setting the photos. I also dislike the tight coupling in that place which seems unnecessary. I...
Show the data from two date fields ordered by the name of the month
I think these SQL useful to you. SELECT `firstname` , `gender` , MONTHNAME( `dol` ) AS 'month' FROM `student_details` WHERE `doa` = '2015-03-01' AND `dol` = '2015-06-17' Below SQL give exact result i think. SELECT `firstname` , `gender` , SUBSTRING(MONTHNAME( `dol` ),1,3) AS 'month' FROM `student_details` WHERE `doa` = '2015-03-01'...
How to specify the prior probability for scikit-learn's Naive Bayes
python,syntax,machine-learning,scikit-learn
The GaussianNB() implemented in scikit-learn does not allow you to set class prior. If you read the online documentation, you see .class_prior_ is an attribute rather than parameters. Once you fit the GaussianNB(), you can get access to class_prior_ attribute. It is calculated by simply counting the number of different...
Why does pattern “*.so?(.*)” produce a syntax error in a script but not on command line?
You are using an extended glob but these aren't enabled by default within a script. In order to using them, they must be explicitly enabled. You can do so by adding this before the line: shopt -s extglob To disable them later on in the script, you can use shopt...
parenthetical parameters in Ruby / Rails
ruby-on-rails,ruby,methods,syntax,parameters
Lack of parentheses in this example indicates the problem of parsing such an expression. Generally, in Ruby you can omit them when it is clear "how to pass arguments". Let's consider the following situation - I have add and multi methods defined: def add(*args) args.inject(:+) end def multi(*args) args.inject(:*) end...
What is the difference between `a` and `*a` where `a` denotes a 2D array?
c,arrays,pointers,multidimensional-array,syntax
Given the declaration int a[3][4]; the following are true: Expression Type Decays to Value ---------- ---- --------- ----- a int [3][4] int (*)[4] Base address of array &a int (*)[3][4] n/a Base address of array *a int [4] int * Base address of first subarray (equivalent to a[0]) a[i] int...
Java For Loop Termination Condition: == vs <= vs >=
A for loop can always be translated to a while loop as follows: for(initialization; condition; step) { block; } To initialization; while (condition) { block; step; } So if your condition is i == upperBound, the loop will never run, because the condition doesn't start out as true. <= will...
Java syntax explanation - getMenuInflater()
The line getMenuInflater().inflate(R.menu.menu_quiz, menu); is a short form of this: MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu_quiz, menu) ...
MySQL - Querying for names for a different table corresponding to their ids
I think you just want two left joins: SELECT e.TO_ADD, e.FROM_ADD, ufrom.USER_FIRST_NAME, uto.USER_FIRST_NAME, e.MESSAGE FROM EMAIL e LEFT JOIN USERS ufrom ON ufrom.USER_ID = e.FROM_ADD LEFT JOIN USERS uto ON uto.USER_ID = e.TO_ADD ORDER BY ufrom.USER_FIRST_NAME DESC; ...
Why is f <$> g <$> x equivalent to (f . g) <$> x although <$> is not right-associative?
haskell,syntax,infix-notation,applicative,infix-operator
Why is f <$> g <$> x equivalent to (f . g) <$> x ...well, this isn't so much a functor-thing as a Haskell-thing. The reason it works is that functions are functors. Both <$> operators work in different functors! f <$> g is in fact the same as...
Android SQLiteException syntax error code 1
You can't call a column "WHEN", since it is a keyword in sqlite
Swift Function Syntax Breakdown
You are using the word "closure" wrong. All functions are closures in Swift. What makes this function special is that is anonymous. That means there is no declaration line — so there needs to be another way of expressing the incoming parameters. Swift's solution is that you put the parameter...
What is correct syntax to use the php date function in a query
MySQL has its own date functions. Use them. In this case use DATE_FORMAT(). $res = $conn -> query("select sum(food.calories) as total_calories, DATE_FORMAT(log.dates, '%y%m%d') as datum from foods food inner join foodlog log on food.id = log.fooditem where log.user = {$_SESSION['userid']} group by datum order by datum"); ...
What's this Coffescript use of then?
Of course ... It calls the newcard.save().then function - thanks @rightfold - which is in the Angular.js promises api. Not immediately obvious out of context of that api which BTW is nicely explained here.
Symbolic notation for functions in Matlab
Partially, but not within the main part of Matlab. If you use MuPAD (type mupad in your Command Window), the engine behind much of the Symbolic Math toolbox, you can display/print results from calculations in your notebook with various levels of formatting. However, it does not appear that one can...
changing letter into an encryption in java. simple call
Acutally its \u0061 = a so one and so forth, it is a primitive way to code i think. it is not a nuclear weapon program. :) not all know this.
Checking, if optional parameter is provided in Dart
syntax,dart,syntax-error,questionmark
The feature existed at some point in Dart's development, but it was removed again because it caused more complication than it removed, without solving the problem that actually needed solving - forwarding of default parameters. If you have a function foo([x = 42]) and you want a function to...
Java - Explicit method call for a generic class? [duplicate]
java,google-app-engine,generics,syntax
The create method accepts generic parameter, so the parameter type was passed. you can read more about generic parameters here...
Looking for a nicer python syntax to pass multiple parameters to a single-parametered lambda
This was unfortunately removed in Python3. :-( The idea was that this hinders introspection. Instead of figuring out how a function is called by the signature, it would require analyzing bytecode (not the syntax tree)....
Why is a defined token not recognized during syntax analysis in C using Bison?
c,syntax,compiler-construction,token,lexical
Your scanner returns NUM when it has found a sequence of digits, not digit. The identifier digit is just used internally in your Flex specification. Then you have another digit defined as a token in your Bison grammar, but it is not connected in any way to the Flex one....
Is it possible to define a CAPL function returning a text string?
You have to do it as you would do with string-based functions : void ErrorCodeToMsg(char buffer[], int code){ buffer = myListOfCodes[code]; } The value will be stored in the buffer using its reference value. It is not possible to return string in Capl. This is why you can't access String...
Why are brackets required to print type information of .?
. without the parentheses only works in infix position. :t however takes an expression, e.g. a function, and to turn an infix operator symbol into an expression, you need to surround it with parens. Consider: 3 + 4 = (+) 3 4 -- pseudocode and myPlus = (+) which is...
Unable to recognize syntax error [closed]
The statement starting on line 10 is missing its terminating semi-colon. my $hash_form = { 'KEY' => $key, 'HASH' => $hash, 'action' => $action, } should be my $hash_form = { 'KEY' => $key, 'HASH' => $hash, 'action' => $action, }; ...
While statement has no body?
Just add an empty body. Like this while( x + ++flips < 8 && board[x + flips][y] == opponent ){}.
Python stats.linregress syntax error
python,syntax,regression,linear
Your last variable, or rather pair of variables, is invalid. Syy/Sxx If that is supposed to be a single variable, know that you cannot have / in your variable name. Python identifiers and keywords Identifiers (also referred to as names) are described by the following lexical definitions: identifier ::= (letter|"_")...
Bash script error server issue
We can simplify a few: #!/bin/bash servers="server1.... server2...." seconds="3" # value for servers to differ (in seconds) for server in $servers do remote=$(ssh -l root ${server} date +%s ) now=$(date +%s) if [ "$remote" -gt "$now" ] then diff=$(expr $remote - $now) else diff=$(expr $now - $remote) fi echo $diff...
What does the builtin function any() do?
python,if-statement,syntax,any
As the docs for any say: Return True if any element of the iterable is true. If the iterable is empty, return False. Equivalent to: def any(iterable): for element in iterable: if element: return True return False So, this is equivalent to: for element in (i in string for i...
What does `\+` signify as an operator in prolog?
It is a non-provable operator. See this link to learn more. Basically, it's true if the argument is not provable.
Why can I call the stream() method on objects of a class that don't have the stream()-method?
java,collections,syntax,java-stream
Did you check the right class and Java version? Java 8's Collection (not Collections) has a stream() default method, which is inherited by ArrayList: /** * Returns a sequential {@code Stream} with this collection as its source. * * <p>This method should be overridden when the {@link #spliterator()} * method...
How to define the type of elements in an rdf:Seq?
There are probably a number of ways to accomplish this, depending on your implementation preferences. My advice is to use the rdf:li special property in place of the arbitrary rdf:_nnn, which is easier to extend. rdf:li is equivalent to rdf:_1, rdf:_2 in order. So the following code blocks are equivalent:...
New python async and await keywords [closed]
In a nutshell, because this is a broad topic: @asyncio.coroutine def foo(): bar = yield from some_async_func() print(bar) asyncio.get_event_loop().run_until_complete(foo()) This defines a coroutine using the asyncio module. foo is a coroutine, and it makes a call to a coroutine some_async_func (because it makes a call to an asynchronous function it...
Syntax error python 2.7 [closed]
return AudioSegment.from_file(getFilePath(filename, format="wav") Looks like you're missing a parenthesis. return AudioSegment.from_file(getFilePath(filename), format="wav") ...
Does the ternary operator work in constant definition?
{187, 187} and {206, 206} aggregates are valid as an initialization expressions, but not as a general-purpose expressions*. That is why a ternary operator does not allow it. If you are making an initializer for a local constant, you could use CGSizeMake: CGSize const ksizeSmall = SOME_BOOLEAN_VARIABLE ? CGSizeMake(187, 187)...
Can I merge an unknown named graph with an other in a SPARQL query?
There is no standard way to change the dataset beign queried after the query starts. This is especially true if FROM is loading from the web. If you can put all the possible graphs in the datasets, you can use GRAPH. if you can't, then your two step approach is...
Mysql Syntax “if length then” statement
The syntax is: SELECT uniqueid AS uniqueid_idx, calldate, src, dst, dstchannel, billsec, SUBSTR(CONVERT(IF(LENGTH(dst)>8,cdr.dst,CONCAT('67',cdr.dst)),UNSIGNED INTEGER),1,6) prefixo_normal, IF(LENGTH(dst) < 4, dst, NULL) AS ramal FROM cdr There's no THEN or END when you use the IF function....
Parenthesis after variable name C++
It appears operator() is overloaded for the tyupe of UDefEnerfyH. One way to do this is this solution #include <iostream> using namespace std; struct MJ { void GetLowEdgeEnergy(size_t arg) { cout << "GetLowEdgeEnergy, arg = " << arg << endl; } void operator ()(size_t arg) { cout << "operator (),...
Ruby on Rails favoriting controller & syntax problems
ruby-on-rails,ruby,syntax,favorites
I'm assuming the User can have many Favorites, since you're attempting to single one out via params[:id]. If that's the case, try changing .favorite to .favorites. Hope that solves it!...
Javascript unusual FOR loop. Please, confirm that my interpretation is correct
The only difference I can see is that c[e[a[1]]] = c[e[a[1]]] || decodeURIComponent(a[2]) is more like var temp = c[e[a[1]]]; if(!temp) { c[e[a[1]]] = decodeURIComponent(a[2]); } else { c[e[a[1]]] = temp; } The apparently-redundant self-assignment c[e[a[1]]] = c[e[a[1]]] is relevant if c[e[a[1]]] = c[e[a[1]]] is defined by an accessor property...
Erlang basic syntax error
In REPL you have to use fun(...) -> ... end: 1> F = fun(X) -> X end. #Fun<erl_eval.6.80484245> 2> F(42). 42 If you have code in file use c command: 1> c(word_count). {ok,word_count} 2> word_count:word_count([]). 0 ...
Confused with the second variable of task : some_random_name1, [:some_random_name2] => :environment in rake?
[:some_random_name2] is referring to arguments that you can pass into your rake task. May I suggest checking out this article which can explain in more depth passing arguments to a rake task. When you call rake -T from the command line, you should see: rake example: some_random_name1[some_random_name2] (assuming your namespace...
Where does the syntax for expressions in SSRS come from?
The SSRS expressions are based on Visual Basic. Expressions are written in Microsoft Visual Basic, and can use built-in functions, custom code, report and group variables, and user-defined variables. Expressions begin with an equal sign (=). Source: Expression Examples (Report Builder and SSRS) The IIF() function is "inherited" from VB,...
Python method that can be called on a list of objects
The only way to do exactly what you're asking for is to subclass python build-in class list. This should help....
How can the suffix for numeric literals long int and long double both be l/L?
A literal number needs to have a period or an exponent to be treated as a floating point literal constant. If it doesn't have any of these, it is treated as an integer literal constant.
PHP search with MySQL error [duplicate]
You're missing a closing curly brace here: if($count == 0){ $output = 'Keine Ergebnisse gefunden!'; }else{ while($row = mysql_fetch_array($query)) { $Vname = $row['Vorname']; $Nname = $row['Nachname']; $id = $row['id']; $output .= '<div>'.$Vname.' '.$Nname.'</div>'; } Notice how you close the while, but you never close the else. Just add a closing...
Is this list comprehension pythonic enough? [duplicate]
python,syntax,list-comprehension
You can use a generator expression: cubed = (x ** 3 for x in range(1, 11)) cube4 = [c for c in cubed if c % 4 == 0] This still iterates over range() only once, but now the x ** 3 expression is calculated just the once as the...
C++ - Why does 2 local references to the same object stay in sync?
c++,pointers,syntax,reference,variable-assignment
string & ref1 = *it; string & ref2 = *it; Okay, so you create two references to the same string. ++it; // After this line, both ref1 && ref2 evaluates to "a" Right, because they are both references to the same string. This is the way you created them. ref2...
VHDL: (vcom-1136: std_logic_vector undefined)
The use of IEEE.std_logic_1164.all is also required before the entity, like: library IEEE; use IEEE.std_logic_1164.all; entity lab2 is The first IEEE.std_logic_1164.all only applies to the package, and package body of the same package, but not to any other design objects like an entity or package, even if these happens to...
How can I tell the dartanalyzer what kind of Element the selected object is?
You can use as to "cast" in Dart. import 'dart:html'; ... if((querySelector('#username') as InputElement).value!="") ...
Scheme several actions if an if-statement proves true
You can try to use begin in an if statement. like so: (if (something) (begin (foo) (bar))) ...
What is the use of text with colon operator (eg: Test:) in java [duplicate]
Text followed by a colon (:) is called a label. It can be used in the context of control structures (such as loops) to break to or continue at. In this context, although perfectly legal, it's pointless.
What does the following javascript syntax mean?
javascript,jquery,plugins,syntax
That translates to: var pluginName; if (window.pluginName) { pluginName = window.pluginName; } else { pluginName = {}; } See for more: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators...
Count variable Invalid Syntax [on hold]
The specific error you are asking about is because of the missing colon: And card1 cannot be called. if guess==card1() count+=1 Should be if guess==card1: count+=1 There is also a missing closing bracket on the guess: guess = int(input(""" Pick One! 1:'Crown', 2:'Anchor', 3:'Heart', 4:'Diamond', 5:'Club', 6:'Spade', 0:'Quit', """)) ...
What is the difference between _ and _variable in prolog?
_ alone is an anonymous variable. Multiple occurrences in the same clause (or the same read-term) represent different variables. A variable starting with _ but containing further characters is not an anonymous variable. Several occurrences represent the same variable. By convention, many Prolog systems require that variables occurring only once...
How to jump/display the column of an error
python,vim,syntax,pylint,syntastic
Syntastic stores the errors in the location list window. You can use :lopen to show it, and then use commands like :ll (or <Enter>) to jump to the error under the cursor. Alternatively, you can also navigate through errors via :lnext and related commands. If the corresponding error message did...
Why does adding parentheses in if condition results in compile error?
The answer is not simply "because Go doesn't need parentheses"; see that the following example is a valid Go syntax: j := 9 if (j > 0) { fmt.Println(j) } Go Spec: If statements: IfStmt = "if" [ SimpleStmt ";" ] Expression Block [ "else" ( IfStmt | Block )...
Yaml syntax to create this array
I think you're after either this: - foo: 1 bar: - one - two - three - foo: 2 bar: - one1 - two2 - three3 Which gives you this structure: [ { "foo": 1, "bar": [ "one", "two", "three" ] }, { "foo": 2, "bar": [ "one1", "two2", "three3"...
Java syntax with “ : ” [duplicate]
It's called a label and it's used for naming loops. It's useful when you have nested loops and you want to apply break; (or continue;) to a particular one. For example: outer: for (int i = 0; i < 5; i++) { inner : for (int j = 0; j...
gen_server handle_info/2 clarification
All function parameter definitions are patterns, and #state{lsock = LSock} = State is one pattern that binds State to the whole term passed as a function call argument, and at the same time asserts that it is a record state and binds State#state.lsock to LSock. In your shell examples, A...