Class & Interface Methods

TypeScript · Methods reference

TypeScript · Methods reference

📋 Overview

Class members, access modifiers, and interface method signatures.

🔧 Methods

Class members

Member	Description
`constructor(...)`	Initialize instance
`method()` / `get` / `set`	Instance methods and accessors
`static method()`	On constructor function
`#privateField`	True private (ES2022)
`protected` / `private` / `public`	Visibility modifiers
`readonly prop`	Assign-once property
`abstract class` / `abstract method`	Must be implemented by subclass
`implements I`	Class satisfies interface contract
`override`	Explicit override of base method (4.3+)

Interface / type shapes

Form	Description
`interface I \{ fn(): void \}`	Callable method signature
`type F = (x: T) => R`	Function type alias
`Optional prop?: T`	May be undefined
`Index signature [k: string]: T`	Dynamic keys

💡 Examples

See parent topic notes for runnable snippets; this page is the complete method index.

⚠️ Pitfalls

Mutating methods return None in Python — do not chain sort() / reverse() expecting a new list.
Default JS sort() compares strings — pass (a,b) => a-b for numbers.
SQL function names differ by dialect — verify Postgres vs MySQL docs.
Django QuerySet.update() skips save() signals and auto auto_now fields on models.

Array & Object Methods (Typed)

TypeScript · Methods reference

Type Operators

TypeScript · Methods reference

On this page

📋 Overview 🔧 Methods Class members Interface / type shapes 💡 Examples ⚠️ Pitfalls 🔗 Related