Related Questions: Benefits of using short-circuit evaluation, Why would a language NOT use Short-circuit evaluation?, Can someone explain this line of code please? (Logic & Assignment operators) There are questions about the benefits of a language using short-circuit code, but I'm wondering what are the benefits for a programmer? Is it...
Given: WHERE (@Id Is NULL OR @Id = Table.Id) If @Id is null: the expression evaluates to true. Does the second part @Id = Table.Id still get considered? or is it sufficient that the expression evaluates to true given that the first part is (which is the case in c#). This is relevant because of some much more complex OR statements whe...
I'm new to c++ and am curious how the compiler handles lazy evaluation of booleans. For example, if(A == 1 || B == 2){...} If A does equal 1, is the B==2 part ever evaluated? ...
Suppose I want to check a bunch of objects to make sure none is null: if (obj != null && obj.Parameters != null && obj.Parameters.UserSettings != null) { // do something with obj.Parameters.UserSettings } It is an alluring prospect to write a helper function to accept a variable number of arguments and simplify this kind ...
I tried something along the lines of: if(myString != nil && myString.length) { ... } And got: -[NSNull length]: unrecognized selector sent to instance Does Objective-C not short-circuit after the first condition fails? ...
So for binary operators on booleans, Java has &, |, ^, && and ||. Let's summarize what they do briefly here: JLS 15.22.2 Boolean Logical Operators &, ^, and | JLS 15.23 Conditional-And Operator && JLS 15.24 Conditional-Or Operator || For &, the result value is true if both operand values are true; otherwise, the result is false....
I'm trying to find out how I can do an "early return" in a scheme procedure without using a top-level if or cond like construct. (define (win b) (let* ((test (first (first b))) (result (every (lambda (i) (= (list-ref (list-ref b i) i) test)) (enumerate (length b))))) (when (and (not (= test 0)) result) ...
Surprisingly, I was unable to find the answer to this on Stack Overflow: Does Python support short-circuiting in boolean expressions? ...
Hi everyone, Quick question here about short-circuiting statements in C#. With an if statement like this: if (MyObject.MyArray.Count == 0 || MyObject.MyArray[0].SomeValue == 0) { //.... } Is it guaranteed that evaluation will stop after the "MyArray.Count" portion, provided that portion is true? Otherwise I'll get a null exception...
I found using AndAlso/OrElse, all the time, VERY annoying. It reduces code readability, especially when conditioning get complicated. Any suggestions? ...
In other words, do the following two statements behave the same way? isFoobared = isFoobared && methodWithSideEffects(); isFoobared &= methodWithSideEffects(); I realize I could just write up a test, but someone might know this offhand, and others might find the answer useful. ...
Sorry if this sounds like a really silly question. But I Googled the web and also Googled specifically both the php.net site and the stackoverflow.com site. I know PHP does short circuit lazy evaluation when using and, or, &&, || operators, but where is it stated loud and clear in the PHP manual??? I found only Wikipedia as the only 't...
Do we have any operator in C# by which I can avoid short circuit evaluation and traverse to all the conditions. say if(txtName.Text.xyz() || txtLastName.Text.xyz()) { } public static bool xyz(this TextBox txt) { //do some work. return false; } It should evaluate all conditions irrespective of output obtained. And after evaluating...
I have a page where you can search for people. They can either get a list of all people, or filter it by certain criteria such as first or last name. So far, I have been trying trying to use the technique detailed in this question. So my code looks like string firstname=... string lastname=... var people=from p in People.All() ...
I am debugging code that has in it expr1 & expr2 where expr1 has a side effect that affects expr2 evaluation result. I suspect that expr2 gets evaluated before expr1, since JLS guarantees left-to-right evaluation for &&, but not necessarily for &. I also suspect that change of evaluation order may be a result of optimization performed by...
I have to obtain dual tones from DTMF 6847 chip.Which pins are to be shorted to obtain different sets of frequencies so that I can see them on the oscilloscope? Please help. ...
If I have the following ... a OrElse b ... and a is True then clearly b is never evaluated. But if I add an Or, then what? a OrElse b Or c Does/should c get evaluated? And what if I put in some brackets? Apologies if this is basic. Of course I can test for the answer myself but I can't find this question answered here or elsewher...
I thought C shell script will behave like C and use short circuit evaluation for logical operators. if ((! -e $cache ) || ("`find $monitor -newer $cache`" != "")) then ... endif But in the if statement, even if the first condition is true, the second is checked giving me errors. Do we have a short circuit logical OR in C shell script...
I need to query data from a second table, but only if a rare set of conditions in the primary table is met: SELECT ..., IF(a AND b AND c AND (SELECT 1 FROM tableb ...)) FROM tablea ... a, b, and c conditions are almost always false, so my thinking is the subquery will never execute for most rows in the result set and thus be way faste...
I've got a query that I've just found in the database that is failing causing a report to fall over. The basic gist of the query: Select * From table Where IsNull(myField, '') <> '' And IsNumeric(myField) = 1 And Convert(int, myField) Between @StartRange And @EndRange Now, myField doesn't contain numeric data in all the rows [it is o...