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    1.1.0 • Public • Published

    Standalone version of Lava.ClassManager

    One of the fastest and most convenient class systems in the world.

    Quick facts:

    • Classes can be generated on server and in browser
    • Supports multiple inheritance
    • Monomorphism optimizations
    • Has powerful features like run-time prototype patching and shared members


    Standalone version is self-contained (it does not have any dependencies, like the main framework).


    ClassManager can generate classes in two modes, depending on is_monomorphic switch. Monomorphic mode generates classes with slower constructors, but fast method calls (due to the fact, that all class instances will have the same internal type, reducing method polymorphism). Polymorphic mode generates fast constructors with slower method calls.

    High quality polymorphic tests are coming soon...

    Meanwhile you can have a look at the following tests, which are not 100% correct:

    Constructor generation performance

    Class generation in ClassManager is slower in comparison to other class systems, but:

    • it's still very fast, so you can comfortably use it in browser
    • generated classes are extremely fast
    • classes can be generated on server (like with CoffeeScript or TypeScript preprocessors)

    There will be no performance tests for class constructor generation time, cause it's not fair to compare class systems with language preprocessors.

    Class construction performance

    Coming soon...

    Method call performance

    Coming soon...

    Usage example

    You may either require("lava-class-manager") (in Node.js environment) or include it directly in browser. You will get a partial copy of Lava object with ClassManager and it's dependencies.

    // in Node.js environment:
    // var Lava = require("lava-class-manager");
    // in browser:
    // <script src="path/to/ClassManager/lib/class_manager.js"></script>
    // namespaces is a must
    Lava.ClassManager.registerRootNamespace('global', window);
        name: null,
        steps: 0,
        food: [], // will NOT be shared across class instances
        // constructor
        init: function(name) {
   = name;
        walk: function() {
        Extends: 'global.Animal',
        init: function(name) {
            this.Animal$init(name); // parent method call
    var cat = new Cat("Garfield");
    Lava.instanceOf(cat, "global.Animal");


    While using compression - you can not mangle method names in class bodies, cause this will break inheritance. Good-behaving compression tools will not do it, anyway.



    • [Feature] Added Lava.ClassManager.is_monomorphic property (true by default) - in this mode generated constructors will preallocate all class properties to reduce function polymorphism. This will make construction slower, but operation will be faster. Each _cClassData now has is_monomorphic property, which indicates if it was built in monomorphic mode.
    • [Feature] Added loadClasses() and loadSkeletons() convenience methods
    • [Refactoring] RegExp objects are now moved to prototype. If you want to have unique copy of regular expression object for each class instance - then you should assign it in constructor.
    • [Refactoring] Changed format of exported classes: now it exports both references and own_references arrays - you should delete either one of them. If you leave references - then you will get large, but fast and truly monomorphic class with it's own methods. In most scenarios you will want to leave own_references for smaller output.
    • [Refactoring] Changed format of generated skeleton (if you did not export classes - then ignore)
    • [Refactoring] Renamed ClassManager#INLINE_SIMPLE_ARRAYS -> inline_simple_arrays
    • [Refactoring] Added Lava.define - proxy to Lava.ClassManager.define
    • [Fix] Fixed several serialization bugs.

    Light performance improvements.


    • [Fix] Fixed an issue in Node.js environment, when generated constructor was invalid. Slightly improved performance.


    • [Feature] Added possibility to store arrays in Shared
    • [Refactoring] Removed _cClassData#level as redundant
    • [Refactoring] exportClass now produces slightly less data
    • [Refactoring] Now it ensures that members, which are shared in parent class, are not marked as shared in inherited class
    • [Refactoring] Shared objects are now copied directly from class body, instead of shallow copy. May matter, if you create class instances before calling ClassManager#exportClass, otherwise ignore


    • Added Lava.instanceOf() method - analog of instanceof JS operator


    npm i lava-class-manager

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