![]() ![]() Check out question 7 function func() // this definition only exists within the curly braces.Īll of these questions are variations on the same theme. In JavaScript, scope is most often defined by functions - if you define a variable within a function, you can’t access it from outside of the function. I suggest you read up on it: You Don’t Know JS: Scope & Closuresīasically, scope defines the context in which a value exists. Scope is a simple concept, but there are a lot of wrinkles that make it difficult to explain in a forum post. (on the app, the different examples of scope are provided above if you complete the challenges on the app) Your Browser User Agent is: **Chrome/.84**. Then, press Reload to restart VS Code and activate the extension. On the VSCode, click the view menu, and select the extension options to check whether you have already installed the Debugger for Edge extension, and already enable it. I don’t understand what a reference error is or what undefined means and I think this is holding me back in my professional career. To debug the client side Angular code, well need to install the Debugger for Edge Extension first. I know this is simple, but I think it’s pretty important ( I could be wrong). This core issue is preventing me from completing the assignments on my own rather than getting spoon-fed answers. I have provided the answers but I dont understand what differentiatesd one from the other. I am trying to understand what scope means so that I can correctly move with the right building blocks to the next tier of understanding, rather than learning sloppy fundamentals. ![]() I think that the jump of the pointeur finish on the nop/ldloc.2 instruction, and "forget" the instanciation of the c_Displa圜lass1.I don’t understand scope and I need feedback abut why these different examples have local/global scope or if they throw a reference error or undefined. IL_0050: stfld string ConsoleApplication5.BreakPointTest/'c_Displa圜lass1'::myString ![]() IL_0043: newobj instance void ConsoleApplication5.BreakPointTest/'c_Displa圜lass1'.ctor() In the "out of the scope" declaration version, the newobj instruction is made from the begining of the method. I don't undestand why VS cannot let me step over the if test and i will be happy if someone can explain me this strange Exception.Īfter comparison of the two IL code (depending on where the myString declaration is made) i can see that VS "cannot" execute the instruction newobj on the hidden class generated and the assignment of the string value is made on null value. To get a "functionnal" code I just have to declare myString out of the scope. When I try to step into the if scope without testing the test value with the mouse then the myString cannot be instanciate with an NullReferenceException throwed. I dont understand why this happens, std should be in the scope of the function which is being executed. But it returns the following error: identifier 'std' is undefined. Qry = qry.Where( item => item = myString ).ToList() // filter the list When the breakpoint triggers, I want to inspect std::cout from the Command Window (or Immediate Window), so I type: >Debug.Print std::cout. Var myString = "bli" // declare and instanciate in scope => NullReferenceException If (test) // BreakPoint here and dragNDrop on next line string myString // If declare out of scope OK Var test = new Random().Next(10) % 2 = 0 // Simulate various cases With the very simplified code below : public void Go() While debugging C# code with VS2010 I test curious behavior that i cannot explain. ![]()
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