Any Type

Any type is a type-system escape hatch that can hold a value of any type.

An any type is useful when a program needs to represent data whose shape is not known ahead of time. It also weakens type checking, because the compiler or type checker has less information about what operations are valid.

Examples include:

• any in Typescript
• interface{} or any in Golang
• Object in Java

Any types are useful for:

• Interoperating with dynamic data
• Representing loosely structured API responses
• Migrating gradually from untyped code to typed code

Any types should usually be narrowed to a more precise type before being used.

Anki

id: any-type-definition deck: Computer Science::Data Types tags: data-types any-type

Q: What is an any type? A: An any type is a type-system escape hatch that can hold a value of any type.

id: any-type-risk deck: Computer Science::Data Types tags: data-types any-type type-safety

Q: Why can any types weaken type safety? A: They give the type checker less information about which operations are valid for a value.