In your code result is not changing, its var properties are changing. Refer comments below: fun copyAddress(address: Address): Address { val result = Address() // result is read only result.name = address.name // but not their properties. result.street = address.street // … return result } val is same as the final modifier in java. As … Read more
A few things you could use: dir() will give you the list of in scope variables: globals() will give you a dictionary of global variables locals() will give you a dictionary of local variables
There is no “pass by reference” available in JavaScript. You can pass an object (which is to say, you can pass-by-value a reference to an object) and then have a function modify the object contents: function alterObject(obj) { obj.foo = “goodbye”; } var myObj = { foo: “hello world” }; alterObject(myObj); alert(myObj.foo); // “goodbye” instead … Read more
Python variables are scoped to the innermost function, class, or module in which they’re assigned. Control blocks like if and while blocks don’t count, so a variable assigned inside an if is still scoped to a function, class, or module. (Implicit functions defined by a generator expression or list/set/dict comprehension do count, as do lambda … Read more
>>> import collections.abc >>> isinstance([0, 10, 20, 30], collections.abc.Sequence) True >>> isinstance(50, collections.abc.Sequence) False note: isinstance also supports a tuple of classes, check type(x) in (…, …) should be avoided and is unnecessary. You may also wanna check not isinstance(x, (str, unicode)) As noted by @2080 and also here this won’t work for numpy arrays. … Read more
See short-circuit evaluation for the explanation. It’s a common way of implementing these operators; it is not unique to JavaScript.
The first way is easier to maintain. Each declaration is a single statement on a single line, so you can easily add, remove, and reorder the declarations. With the second way, it is annoying to remove the first or last declaration because they start from the var keyword and finish with the semicolon respectively. Every … Read more
Type info variables to list “All global and static variable names” (huge list. Type info locals to list “Local variables of current stack frame” (names and values), including static variables in that function. Type info args to list “Arguments of the current stack frame” (names and values).
I believe there is a difference. Let’s rename them so that we can talk about them more easily: const double PI1 = 3.141592653589793; constexpr double PI2 = 3.141592653589793; Both PI1 and PI2 are constant, meaning you can not modify them. However only PI2 is a compile-time constant. It shall be initialized at compile time. PI1 … Read more
add the following to you preamble: \newcommand{\newCommandName}{text to insert} Then you can just use \newCommandName{} in the text For more info on \newcommand, see e.g. wikibooks Example: \documentclass{article} \newcommand\x{30} \begin{document} \x \end{document} Output: 30