How to use

Just add a Memoize mutator to your class implementations after all other methods have been defined. A __memoized hash is created where all return values are stored. Stored values are NOT dependent on the arguments passed so be sure you think before memoizing. If you need to unmemoize a method just call instance.unmemoize(methodName) or instance.unmemoizeAll() to clear the stored value and allow another execution of the method.

Calculus = new Class({
    initialize : function(base_function){
        this.base = base_function;
    },
    setFunction(func){
        this.base = func;
    },
    integral : function(){
        // potentially complex code
        return result;
    },
    derivative : function(){
        // potentially complex code
        return result;
    },
    Memoize : ['integral', 'derivative']
});

var calc = new Calculus('y = 3x^2 + 2x + 1');

calc.derivative() => (potentially complex code runs) => 'dy/dx = 6x + 2'
calc.derivative() => 'dy/dx = 6x + 2'

calc.setFunction('y = 9x + 2')

calc.derivative() => 'dy/dx = 6x + 2'
calc.unmemoize('derivative') => '6x + 2'
calc.derivative() => (potentially complex code runs) => 'dy/dx = 9'

calc.unmemoizeAll();

calc.derivative() => (potentially complex code runs) => 'dy/dx = 9'

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