Module pattern
The module pattern is a software design pattern that encapsulates implementation details and state while exposing a controlled public interface.
Secrets of the JavaScript Ninja, Second Edition
A design pattern that encapsulates private implementation details behind a public interface, typically by returning an object from a closure or immediate function.
- How it is used
- Organizes growing JavaScript applications into reusable units with public operations and hidden implementation details.
- How deep it goes
- Works through IIFE scope, closure-backed private state, a returned interface, and augmentation with separately scoped internals.
- Examples
- Uses a browser click counter and a scroll-counting extension to show private state, public methods, and augmentation.
- What you can do after
- Build it from scratch with an IIFE, a returned interface object, and closure-preserved private state.
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Functional Programming in JavaScript
A JavaScript encapsulation pattern that exposes a public API while keeping internal state and helper functions hidden.
- How it is used
- Packages functional JavaScript code into encapsulated modules with a deliberately limited public API.
- How deep it goes
- Explains IIFE encapsulation, closure access, private variables, exported methods, and reduced global references.
- Examples
- Uses a zip-code factory whose returned methods access hidden code and location variables.
- What you can do after
- Apply closures and IIFEs to build JavaScript modules with hidden state and exposed behavior.
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Related concepts
- objectuses · A computational object is a runtime entity or structured value representing data, state, or a resource, with properties or operations defined by its programming model.
- closureuses · A closure is a function or callable value together with access to bindings from the lexical environment in which it was created.
- immediately invoked function expressionuses · An immediately invoked function expression is a JavaScript function expression that is defined and executed immediately within the same syntactic construct, often creating an isolated scope.
- modulealternative to · A module is a distinct, bounded software unit that groups related code or functionality and provides an organizational or interaction boundary within a larger system.
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