For instance:
<#assign foo="foo"/>
<#local bar="bar"/>
When should one be used instead of the other
#local creates or replaces a variable that lives in the scope of the ongoing macro or function call, and thus is used inside a #macro or #function.
#assign creates or replaces a variable in the current namespace (or in the explicitly designated namespace via in somenamespace). If you don't use multiple namespaces (ie., you don't use #import) then you can think of them as global variables.
See also:
Kinds of variables: http://freemarker.org/docs/dgui_misc_var.html
Namespaces: http://freemarker.org/docs/dgui_misc_namespace.html
Related
In V8 at least, in the debugger, you see local, script and global categorizing the variables.
I got a reference to global. All you do for that is set this on entry to a property to use later if need be.
However, I can't find how to save a reference to the script object. I think it exists because that's what the debugger is looping through in the watch window.
Before ES6, All declarations outside a function (and function declaration themselves) were properties of global object. After ES6, There are two kinds of global records:
Object record- Same as ES5.
Function declarations
Function generators
Variable assignments var
Declarative record - New
let, const, class, etc
Those in the declarative record are not accessible from the global "object", though they are globals themselves. They are accessible from the script, but the object/internal data structure holding the declarative records itself is not accessible or enumerable from inside the script. This declarative record is shown in v8 debugger as properties of script object.
References:
Global environment records
Related Answers:
ES6- What about introspection
Do let statements create properties on the global object
In Regular Expression Extractor I have stored reference name as prasad.
If I give my reference name to further scripts ${prasad} where ever I want it is working fine.
But I want to store these reference name as user defined variables (Global variables).
I am using only one thread group.
I am doing performance automation scripts so I want to store that reference name as user defined variable.
I didn't not understand properly,(Below Answer)..Can any one help me with brief explanation please...
This is stated in JMeter's best practices or mailing list answer:
Variables are local to a thread; a variable set in one thread cannot
be read in another. This is by design. For variables that can be
determined before a test starts, see Parameterising Tests (above). If
the value is not known until the test starts, there are various
options:
Store the variable as a property - properties are global to the JMeter
instance
To store in JMeter's "global variable"/property add JSR223 Sampler
props.put("a", vars.get("a"));
Now you can see you "global" variable ${a}
In JMeter, I have added a Config Element of User Defined Variables to state my variable data. However, I see I can do the same thing up in the main Test Plan element.
When should you define your variables within the Test Plan and when should you define them within the Config Element? What's the pro/con of each?
Thanks.
They are the same. Take a look at User Defined Variables description:
The User Defined Variables element lets you define an initial set of variables, just as in the Test Plan
But using separate config elements makes sense for 2 reasons:
Script organization. For example if you have many variables, instead of dumping them all in main Test Plan element, you could define several config elements with the name that suggests what kind of variables they store.
Ability to use variables defined in previous User Defined Variables elements. According to the same reference:
UDVs are processed in the order they appear in the Plan, from top to bottom. <...> the variables are not available for use until after the element has been processed, so you cannot reference variables that are defined in the same element. You can reference variables defined in earlier UDVs or on the Test Plan.
So having several elements provides you with an ability to use previously defined variables in the further ones. One of the use cases is, for instance, definition of some reusable function(s) in one User Defined Variables element, and using them in the following User Defined Variables elements.
From what I am reading, a delegate instance is always defined with a class as an input or inside a class.
Why can't I define a delegate instance independently?
A delegate is a type, and you can define it at namespace scope (including the global namespace).
Since delegates are reference types, delegate instances always are placed on the managed (garbage collected) heap. Delegate instances can be created with the gcnew operator, the Delegate::CreateDelegate method, or using stack semantics syntax (C++/CLI only).
A reference variable of delegate type (including stack semantics syntax variables which wrap a permanently-bound reference, an instance on the heap, and an automatic call to IDisposable::Dispose) can exist as an instance or static member of a managed type, an automatic local variable, a static local variable, or (in C++/CLI) as a global (namespace scope) variable.
while learning Rails, I keep hearing Local vs Instance but I can't find a definition of the two & the differences. And I'd like to avoid making assumptions.
What are the two and how are they different?
Thanks
The main difference between local and instance variable is that local variable is only available in controller, where as instance variable is available in corresponding views also. The controller and views do not share local variables.
Thanks, Anubhaw
The main differences between local and instance variables are as follows
local variable has its scope restriction i.e not available to another methods where as instance available to another
local and instance variable is also available in view
instance variable is separate for each object