declare inside a function doesn’t work as expected. I needed read-only global variables declared in a function. I tried this inside a function but it didn’t work: declare -r MY_VAR=1 But this didn’t work. Using the readonly command did: func() { readonly MY_VAR=1 } func echo $MY_VAR MY_VAR=2 This will print 1 and give the … Read more
proxy came first and you should likely favor bind as it is a standard. The way they are called varies slightly (due to being attached to Function.prototype vs just being a function) but their behavior is the same. There is a pretty good post here: jQuery.proxy() usage, that ends with that advice.
The reason why you can access “out of scope” or “free” variables in ECMAScript is the so-called scope chain. The scope chain is a special property from each execution context. As mentioned several times before, a context object looks at least like: [[scope]] Variable / Activation Object “this” context value Each time you access a … Read more
The error that you get when you try to run your code is: UnboundLocalError: local variable ‘a’ referenced before assignment … which, on the face of it, seems strange: after all, the first statement in the code above (a = 15) is an assignment. So, what’s going on? Actually, there are two distinct things happening, … Read more
You can use a global variable within other functions by declaring it as global within each function that assigns a value to it: globvar = 0 def set_globvar_to_one(): global globvar # Needed to modify global copy of globvar globvar = 1 def print_globvar(): print(globvar) # No need for global declaration to read value of globvar … Read more
According to the standard specification: 1 … names declared in the for-init-statement are in the same declarative-region as those declared in the condition 3 If the for-init-statement is a declaration, the scope of the name(s) declared extends to the end of the for-statement. [§6.5.3] and 4 Names declared in the for-init-statement, the for-range-declaration, and in … Read more
Which is the default scope of a Spring 4 @Service? The default scope is singleton It is reasonable to design a Service implementation in order to store some info, related to the current logged user (according to the current HTTP session) Yes. In that case, the service will have to have the scope “session”. See … Read more
readdir is asynchronous. It won’t get the results right away. You should use the filePaths inside the callback. The only reason why the console shows the value is because the console evaluates the array when you unfold it. When you press the little arrow on the left, put the mouse on the i box on … Read more
Functions are a type of object which are a type of value. Values can be stored in variables (and properties, and passed as arguments to functions, etc). A function declaration: Creates a named function Creates a variable in the current scope with the same name as the function (unless such a variable already exists) Assigns … Read more