What does double colon do in Ruby?

It means you can keep things separate. For example you can have one method called “run” in your code and you will still be able to call your method rather than the “run” method that has been defined in some other library that you have linked in. so to access the class Article we use A::Article.

What does :: In Ruby mean?

The :: is a unary operator that allows: constants, instance methods and class methods defined within a class or module, to be accessed from anywhere outside the class or module. If no prefix expression is used, the main Object class is used by default.

What is colon used for in Ruby?

Ruby symbols are created by placing a colon (:) before a word. You can think of it as an immutable string. A symbol is an instance of Symbol class, and for any given name of symbol there is only one Symbol object.

What does double colon mean?

scope resolution operator
From Wikipedia, the free encyclopedia. The double colon ( :: ) may refer to: an analogy symbolism operator, in logic and mathematics. a notation for equality of ratios. a scope resolution operator, in computer programming languages.

What is unary operator in Ruby?

In Ruby, a unary operator is an operator which only takes a single ‘argument’ in the form of a receiver. For example, the – on -5 or ! on ! true . In contrast, a binary operator, such as in 2 + 3 , deals with two arguments.

What is unless in Ruby?

Ruby provides a special statement which is referred as unless statement. This statement is executed when the given condition is false. In if statement, the block executes once the given condition is true, however in unless statement, the block of code executes once the given condition is false.

What does Colon variable mean in Ruby?

Basically the colon operator is for assign a symbol.

Which feature uses double colon?

3 Answers. It means pseudo element selector. It means the element to the right doesn’t exist in the normal DOM, but can be selected.

Why double colon is used in C++?

Two colons (::) are used in C++ as a scope resolution operator. This operator gives you more freedom in naming your variables by letting you distinguish between variables with the same name.