This was explained by Mads Torgersen in C# Design Meeting Notes where local functions were first discussed: You want a helper function. You are only using it from within a single function, and it likely uses variables and type parameters that are in scope in that containing function. On the other hand, unlike a lambda … Read more
In the absence of any preprocessor stuff going on, foo‘s signature is equivalent to int foo (int *bar) The only context in which I’ve seen people putting seemingly unnecessary parentheses around function names is when there are both a function and a function-like macro with the same name, and the programmer wants to prevent macro … Read more
From the Docs: (function( $ ){ $.fn.myfunction = function() { alert(‘hello world’); return this; }; })( jQuery ); Then you do $(‘#my_div’).myfunction();
The previously accepted answer has been deprecated as of Python 3.0. Instead of using inspect.getargspec you should now opt for the Signature class which superseded it. Creating a Signature for the function is easy via the signature function: from inspect import signature def someMethod(self, arg1, kwarg1=None): pass sig = signature(someMethod) Now, you can either view … Read more
The colon is for implementing methods that pass self as the first parameter. So x:bar(3,4)should be the same as x.bar(x,3,4).
You could simply use return which does exactly the same as return None Your function will also return None if execution reaches the end of the function body without hitting a return statement. Returning nothing is the same as returning None in Python.
The first function in an m-file (i.e. the main function), is invoked when that m-file is called. It is not required that the main function have the same name as the m-file, but for clarity it should. When the function and file name differ, the file name must be used to call the main function. … Read more
In javascript you can call a function (even if it has parameters) without parameters. So you can add default values like this: function func(a, b){ if (typeof(a)===’undefined’) a = 10; if (typeof(b)===’undefined’) b = 20; //your code } and then you can call it like func(); to use default parameters. Here’s a test: function func(a, … Read more
Like this: [[ $(type -t foo) == function ]] && echo “Foo exists” The built-in type command will tell you whether something is a function, built-in function, external command, or just not defined. Additional examples: $ LC_ALL=C type foo bash: type: foo: not found $ LC_ALL=C type ls ls is aliased to `ls –color=auto’ $ … Read more
I typically use function attributes as storage for annotations. Suppose I want to write, in the style of C# (indicating that a certain method should be part of the web service interface) class Foo(WebService): @webmethod def bar(self, arg1, arg2): … then I can define def webmethod(func): func.is_webmethod = True return func Then, when a webservice … Read more