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How to declare default-function for a class?


How to declare default-function for a class?

By : Naomi
Date : October 17 2020, 06:10 AM
seems to work fine This would need to be a JavaScript proposal.
You can't make a JavaScript class that behaves like this, but you can make a regular function that acts like that, though it takes some gymnastics:
code :
interface Logger {
  (message: string): void;
  setFileName(filename: string): void;
}

const logger = function (message: string) {

} as Logger;

logger.setFileName = function (filename: string) {

}

logger.setFileName("./debug.log");
logger("Log this message");
interface Logger {
  (message: string): void;
  setFileName(filename: string): void;
}

const createLogger = (): Logger => {
  let _filename: string;
  const logger = function (message: string) {
    console.log(_filename, message);
  } as Logger;

  logger.setFileName = function (filename: string) {
    _filename = filename;
  }

  return logger;
}

const logger1 = createLogger();
const logger2 = createLogger();
logger1.setFileName("./debug1.log");
logger2.setFileName("./debug2.log");
logger1("one");
logger2("two");

// Output:
// ./debug1.log one
// ./debug2.log two


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How do I declare a default constructor for sub-class of abstract class?

How do I declare a default constructor for sub-class of abstract class?


By : user1748289
Date : March 29 2020, 07:55 AM
I wish this help you You can't instantiate Foo since it's abstract.
Instead, Bar needs a constructor which calls the super(String) constructor.
code :
public Bar(String text) {
   super(text);
}
public Bar() {
   super(DEFAULT_TEXT);
}
How do I declare an array of objects whose class has no default constructor?

How do I declare an array of objects whose class has no default constructor?


By : user1797642
Date : March 29 2020, 07:55 AM
it should still fix some issue For an array you would have to provide an initializer for each element of the array at the point where you define the array.
For a vector you can provide an instance to copy for each member of the vector.
code :
std::vector<Foo> thousand_foos(1000, Foo(42));
Can i declare class or member using keyword default?

Can i declare class or member using keyword default?


By : jyst
Date : March 29 2020, 07:55 AM
With these it helps There is no access modifier called as default, if you don't specify any modifier for class or method, implicitly, they default to package private.
But, Java has a default keyword, which is used in switch case statements. If the supplied option not in any case, and if you specified the default behavior then that will be used.
code :
public class SwitchDemo {
    public static void main(String[] args) {

        int month = 8;
        String monthString;
        switch (month) {
            case 1:  monthString = "January";
                     break;
            case 2:  monthString = "February";
                     break;
            case 3:  monthString = "March";
                     break;
            case 4:  monthString = "April";
                     break;
            case 5:  monthString = "May";
                     break;
            case 6:  monthString = "June";
                     break;
            case 7:  monthString = "July";
                     break;
            case 8:  monthString = "August";
                     break;
            case 9:  monthString = "September";
                     break;
            case 10: monthString = "October";
                     break;
            case 11: monthString = "November";
                     break;
            case 12: monthString = "December";
                     break;
            default: monthString = "Invalid month";
                     break;
        }
        System.out.println(monthString);
    }
}
Scala declare class with default value for field

Scala declare class with default value for field


By : ystoad
Date : March 29 2020, 07:55 AM
around this issue You have a syntax error. Unlike java, you need to declare whether the field is val (equivalent to final in java) or var (can be changed after first assignment).
You need to declare it like this:
How to declare the return of a function as the default parameter to another function without calling the first function?

How to declare the return of a function as the default parameter to another function without calling the first function?


By : P_Mo
Date : September 24 2020, 08:00 PM
around this issue It seems a litle confuse, but my task is the following: , Just have the default as None, then check for that in the function:
code :
def automation(command, servers=None, mixed=False, logs=False, csv=False):
    if servers is None:
        servers = read_servers_list()
    . . .
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