What is the use of underscore variable in REPL session?
Underscore(_) is a special variable in node which stores the result of last expression evaluation. It can be used to access result of last command execution — similar to $? in bash.
Why put an underscore in front of a variable?
Many people like to have private fields prefixed with an underscore. It is just a naming convention. It’s just a convention some programmers use to make it clear when you’re manipulating a member of the class or some other kind of variable (parameters, local to the function, etc).
Why do we use constructor overloading?
Why do we use constructor overloading? Explanation: The constructors are overloaded to initialize the objects of a class in different ways. This allows us to initialize the object with either default values or used given values. If data members are not initialized then program may give unexpected results.
When a copy constructor is called?
Copy constructor is called when a new object is created from an existing object, as a copy of the existing object. Assignment operator is called when an already initialized object is assigned a new value from another existing object.
What is Setattr () used for?
Python setattr() Function The setattr() function sets the value of the specified attribute of the specified object.
What is the purpose of using friend function?
In object-oriented programming, a friend function, that is a “friend” of a given class, is a function that is given the same access as methods to private and protected data. A friend function is declared by the class that is granting access, so friend functions are part of the class interface, like methods.
How is destructor overloading done?
An overloaded destructor would mean that the destructor has taken arguments. Since a destructor does not take arguments, it can never be overloaded.
What are the methods which begin and end with two underscore characters called?
What are the methods which begin and end with two underscore characters called? Explanation: Special methods like __init__ begin and end with two underscore characters. 7. Special methods need to be explicitly called during object creation.
What is Getattr () used for?
getattr() function is used to access the attribute value of an object and also give an option of executing the default value in case of unavailability of the key.
How do I get an underscore symbol on my keyboard?
An underscore, _, can be typed in by pressing the shift button on the keyboard and the button located between the 0 key and the = key at the same time.
What is the underscore sign look like?
The underscore looks like a dash below the letters ( _ ). The underscore sign is also called: understrike.
Which keyword is used for friend function?
A friend function in C++ is a function that is preceded by the keyword “friend”. When the function is declared as a friend, then it can access the private and protected data members of the class. A friend function is declared inside the class with a friend keyword preceding as shown below.
What are the two main types of function?
What are the two main types of functions? Explanation: Built-in functions and user defined ones.
Which keyword is used for function?
Explanation: Functions are defined using the def keyword. After this keyword comes an identifier name for the function, followed by a pair of parentheses which may enclose some names of variables, and by the final colon that ends the line. Next follows the block of statements that are part of this function.