Your post is correct. Unfortunately, if you need to use an optional parameter at the very end of the parameter list, you have to specify everything up until that last parameter. Generally if you want to mix-and-match, you give them default values of ” or null, and don’t use them inside the function if they … Read more
From MSDN: If two candidates are judged to be equally good, preference goes to a candidate that does not have optional parameters for which arguments were omitted in the call. This is a consequence of a general preference in overload resolution for candidates that have fewer parameters.
No, it is not possible (before PHP 8.0): if you want to pass the third parameter, you have to pass the second one. And named parameters are not possible either. A “solution” would be to use only one parameter, an array, and always pass it… But don’t always define everything in it. For instance : … Read more
Dynamically changing searches based on the given parameters is a complicated subject and doing it one way over another, even with only a very slight difference, can have massive performance implications. The key is to use an index, ignore compact code, ignore worrying about repeating code, you must make a good query execution plan (use … Read more
ES2015 and later In ES2015, parameter destructuring can be used to simulate named parameters. It would require the caller to pass an object, but you can avoid all of the checks inside the function if you also use default parameters: myFunction({ param1 : 70, param2 : 175}); function myFunction({param1, param2}={}){ // …function body… } // … Read more
Surprised no one mentioned C# 4.0 optional parameters that work like this: public void SomeMethod(int a, int b = 0) { //some code } Edit: I know that at the time the question was asked, C# 4.0 didn’t exist. But this question still ranks #1 in Google for “C# optional arguments” so I thought – … Read more
There are several ways to simulate optional parameters in Java: Method overloading. void foo(String a, Integer b) { //… } void foo(String a) { foo(a, 0); // here, 0 is a default value for b } foo(“a”, 2); foo(“a”); One of the limitations of this approach is that it doesn’t work if you have two … Read more
There are two related concepts, both called “keyword arguments“. On the calling side, which is what other commenters have mentioned, you have the ability to specify some function arguments by name. You have to mention them after all of the arguments without names (positional arguments), and there must be default values for any parameters which … Read more
What is the double pipe operator (||)? The double pipe operator (||) is the logical OR operator . In most languages it works the following way: If the first value is false, it checks the second value. If that’s true, it returns true and if the second value is false, it returns false. If the … Read more