Memoized Decorator

A fork of memoized-decorator that takes class properties into consideration by attaching the memoization cache at the object level rather than class level.

Serializes arguments by .toString() or JSON.strinigify for objects literals & arrays. null & undefined safe.

Installation

npm install --save memoized-class-decorator

Usage

import memoize = require('memoized-class-decorator');

class Foo {

  constructor(private readonly num: number) { }

  @memoize
  public myMethod(add: number) {
    return this.num + add;
  }
}

const f1 = new Foo(5);

f1.myMethod(5);  //= 10 (method is invoked)
f1.myMethod(10); //= 15 (method is invoked)
f1.myMethod(5);  //= 10 (method is not invoked)

const f2 = new Foo(0);

f2.myMethod(5);  //= 5 (method is invoked, each object has it's own cache)

Note that if an object is passed to the method with an id property, the value of that propery will be used as the cache key. This is to reduce the time needed to serialize complex objects.