Method addFact

src/engine.js:162–174

* Add a fact definition to the engine. Facts are called by rules as they are evaluated. * @param {object|Fact} id - fact identifier or instance of Fact * @param {function} definitionFunc - function to be called when computing the fact value for a given rule * @param {Object} options - opti

(id, valueOrMethod, options)

   * @param {Object} options - options to initialize the fact with. used when "id" is not a Fact instance
   */
  addFact (id, valueOrMethod, options) {
    let factId = id
    let fact
    if (id instanceof Fact) {
      factId = id.id
      fact = id
    } else {
      fact = new Fact(id, valueOrMethod, options)
    }
    debug(`engine::addFact id:${factId}`)
    this.facts.set(factId, fact)
    return this
  }

  /**
   * Remove a fact definition to the engine.  Facts are called by rules as they are evaluated.