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Code & Deliverynoun · /ɪnˈherɪtəns/

inheritance

In simple English

Inheritance is a core concept in object-oriented programming (OOP) that enables code reuse and creates hierarchical relationships between classes. When a child class inherits from a parent class, it automatically gains access to the parent's methods and properties, reducing code duplication and making the codebase more maintainable. This is fundamental to how modern software is designed, allowing developers to build on existing code foundations rather than rewriting functionality. In real team discussions, developers use inheritance to organize code logically, establish clear relationships between data types, and make systems more scalable. However, teams often debate whether to use inheritance or composition, as inheritance can sometimes create overly complex hierarchies that become difficult to manage.

How does inheritance work in object-oriented programming, and when should you use it in your code?

At a glanceCEFR B2
Commonness5/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We are using inheritance to avoid code duplication.
✓The child class inherits from the parent class.
✓Deep inheritance hierarchies make the code harder to maintain.

Real examples

in a standup

"I finished implementing inheritance for the User and Admin classes so we do not duplicate authentication code."

in a code review

"This design uses inheritance well because the Vehicle class provides common properties for Car and Truck."

in a team meeting

"We need to reconsider our inheritance structure because it has too many levels and is becoming difficult to test."

Don't say this

Handle with care. Do not confuse with the general English meaning of inheriting money or property. In tech, it is purely about class hierarchies and code reuse.

✕Inheritance is when you receive money from your family.
✓In programming, inheritance is when a class gets methods and properties from another class.— Inheritance in tech has a completely different meaning from the everyday English word.
✕We inheritance this code from the legacy system.
✓We inherited this code from the legacy system.— Inheritance is a noun, not a verb. The past tense verb form is inherited.
✕The inheritance allows code duplication.
✓Inheritance prevents code duplication by allowing reuse.— Inheritance is designed to reduce, not create, duplication.

Other forms

noun

inheritance

"Inheritance is a pillar of object-oriented design."

verb

inherit

"The Dog class inherits from the Animal class."

verb (past tense)

inherited

"We inherited the logging functionality from the base class."

adjective

inherited

"The inherited methods are available to all subclasses."

Often used with

single inheritanceWhen a class inherits from one parent class only.
multiple inheritanceWhen a class inherits from more than one parent class (not supported in all languages).
inheritance hierarchyThe structure of parent-child relationships between classes.
deep inheritanceToo many levels in the inheritance chain, which can create maintenance problems.
override inheritanceTo replace a parent class method with a child class version.
inherit fromThe preposition used to describe which class you are inheriting from.

Similar words

subclassingA more technical term for creating a subclass that inherits from a parent class.
extensionSome languages use extend instead of inherit, but the concept is the same.

Opposites

compositiondelegation

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Practice

Try it

4 quick exercises

Complete the sentence

1. The Employee class _______ properties and methods from the Person class.

Spot the mistake

2. Which sentence uses inheritance incorrectly?

Pick the most natural phrasing

3. Your colleague asks about your class structure. How do you respond?

Rewrite naturally

4. Rewrite this using inheritance naturally: 'The Admin class gets all the same methods as User, plus some special ones.'

Questions

Quick poll

Have you said "inheritance" in a standup this week?

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