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This question is not very useful because the method reference operator was removed from Ruby 2.7.0 before release. This question is left up for historical reasons.
Ruby 2.7.0-preview1 has introduced the method reference operator .: as an experimental feature. (more here and here).
There are some abstract examples available for how to use this new operator:
method = 42.:to_s
=> #<Method: Integer#to_s>
method.receiver
=> 42
method.name
=> :to_s
method.call
=> "42"
and:
method = File.:read
=> #<Method: File.read>
method.call('/Users/foo/.zshrc')
=> "export ZSH=$HOME/.zsh"
These abstract examples are not representative of real-world implementations. What is the plain-English explanation of the purpose and use of the method reference operator, defined in terms of practical and real-world examples?
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Method references are a special type of lambda expressions. They're often used to create simple lambda expressions by referencing existing methods. There are four kinds of method references: Instance methods of an arbitrary object of a particular type
Java provides a new feature called method reference in Java 8. Method reference is used to refer method of functional interface. It is compact and easy form of lambda expression.
Method references are a special type of lambda expressions. They’re often used to create simple lambda expressions by referencing existing methods. There are four kinds of method references: Static methods. Instance methods of particular objects. Instance methods of an arbitrary object of a particular type. Constructor.
Method references help to point to methods by their names. A method reference is described using "::" symbol. A method reference can be used to point the following types of methods −. Static methods. Instance methods. Constructors using new operator (TreeSet::new)
The method reference operator .: is simply syntactic sugar for Object#method just like the function call operator .(). is simply syntactic sugar for #call.
Thus, the use cases for the method reference operator are the exact same ones as the use cases for the Object#method method … just with less keystrokes.
98
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