How deeply does Kotlin in Action, 2E cover private member?

Defines class and file visibility, then contrasts private with public, protected, internal, and Java package-private access.

Private member

As explained in Kotlin in Action, 2E

The private modifier restricts access to a Kotlin declaration to its containing class or, for top-level declarations, its containing file.

A private declaration hides implementation details from dependent code. Kotlin permits access inside the containing class; for a top-level declaration, access is limited to the containing file. section 4.1.3

Class member versus external access

A `TalkativeButton` can declare `private fun yell()`, keeping that operation inside the class. The example also contrasts it with `protected fun whisper()`, which is intended for subclasses rather than unrelated external code.

How Kotlin in Action, 2E covers it

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Also explained in

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Software Design for Python ProgrammersA private instance variable is an object state variable whose implementation access is restricted by a class's private naming convention or interface design.
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The Well-Grounded Rubyist, Fourth EditionA private instance method is an instance method whose invocation cannot use an explicit receiver other than self.
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Object-Oriented Software Design in C++
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The Joy of JavaScriptA class method that cannot be accessed from outside the class definition.
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Pro Angular 16The private keyword restricts a class member's access to the class that defines it.
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Essential TypeScript 5, Third EditionA private field is a JavaScript class data member marked with # whose access is enforced by the JavaScript runtime and restricted to its defining class.
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Python How-ToA private method is a class method intended for internal use whose name or access convention discourages or restricts direct access by callers.
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Web Components in Action
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Functional Programming in JavaScriptA private variable is a program value that is intentionally inaccessible from outside its defining abstraction.
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Grokking Data StructuresA private attribute is an object attribute intended to be accessed only within the implementation that defines it.
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The Quick Python Book, Fourth EditionA private instance variable is an instance attribute represented by a name-mangled identifier intended to restrict direct access from subclasses.

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Related concepts

leading underscore conventionconfigured by · The leading underscore convention prefixes an identifier with an underscore to signal intended internal or non-public use without enforcing access restrictions.
top-level methodincludes · A top-level method is a Ruby method available from the top-level execution context, typically through private methods supplied by Kernel.
methodkind of · A method is a callable operation associated with an object or type and invoked through that association.
encapsulationimplements · Encapsulation is a software design principle that contains state and implementation details behind a controlled interface, limiting direct access from outside.
attributekind of · An attribute is a named property, value, or piece of information associated with an entity, object, or program element.

This explainer was generated by Manning's knowledge graph from the text of Kotlin in Action, 2E. The section links point to the parts of the book it draws on.