null-check

if((isnull(@value,''))='') I want to know whether the above piece of code works in checking if the variable is null or empty. Yes, that code does exactly that. You can also use: if (@value is null or @value = '') Edit: With the added information that @value is an int value, you need instead: if (@value is null) An int value can never contain the value '' . AnasChavadi Use This way is Better if LEN(ISNULL(@Value,''))=0 This check the field is empty or NULL Yes, you could also use COALESCE(@value,'')='' which is based on the ANSI SQL standard: SELECT CASE WHEN COALESCE(@value,'')='' THEN 'Yes,

Is there a difference between null != something and something != null in Java. And if there is a difference then which one should I use and why?? its probably comming from the so-called joda-conditions where you write "bla" == myVariable instead of myVariable == "bla" because it could happen to accidentially write myVariable = "bla" which returns "bla" in some languages but also assign "bla" to myVariable There's no difference between null != something and something != null . You must be thinking about the person.getName().equals("john") and the "john".equals(person.getName()) difference: the

I suppose method call chain below. void DoSomething() { ObjectA a = CreateA(); if (a != null) { a.Foo(); } } ObjectA CreateA() { ObjectB b = CreateB(); if (b != null) { ObjectA a = b.ToA(); return a; } return null; } If method call depth get deeper, null checking will be more overlapped. Is there any good solution for this? Modified I changed example code. It can't solve my problem that change CreateA to constructor. The problem is only unnecessary null check chaining overlapping. void SetImage() { UISprite image = GetSprite(); if (image != null) { image.spriteName = "hat"; } } UISprite

This question already has an answer here: Typescript the safe navigation operator ( ?. ) or (!.) and null property paths 5 answers Replacement of Elvis Operator of Angular2 in Typescript 2 answers We have the Null coalescing operator in .NET and we can use as below string postal_code = address?.postal_code; Same thing can we do in React JS? What i found like we can do with && operator in address.ts file string postal_code = address && address.postal_code; what i need like .net feature is possible in typescript with react JS, is that possible ? something like: string postal_code = address?

Can anyone tell me what the performance cost is of checking if an object or property of an object is null in c#? I am working on an ASP.NET MVC application that the null checking is being done in the Model and then done again in the view. I feel that this is excessive but if there is no real performance hit then I don't see the harm in doing things this way. I don't think its measurable if you're doing it just once while rendering and once while initializing the model. It would have an impact if it were inside a computation-intensive loop though. Things like querying the database, read/write

How do I perform a null-check on a dynamic object? Pseudo code: public void Main() { dynamic dynamicObject = 33; if(true) { // Arbitrary logic dynamicObject = null; } Method(dynamicObject); } public void Method(dynamic param) { // TODO: check if the content of 'param' is equal to null } JaredPar Are you worried about the possibility the dynamic object will have a custom equality operator that will change the way the null is interpreted? If so just use Object.ReferenceEquals if (Object.ReferenceEquals(null, param)) { ....... } You can always just make the param of type object, that's what the