patterns

name	patterns
description	JavaScript design patterns and architectural best practices.
sasmp_version	1.3.0
bonded_agent	06-modern-es6-advanced
bond_type	PRIMARY_BOND
skill_type	reference
response_format	code_first
max_tokens	1500
parameter_validation	{"required":["topic"],"optional":["pattern_type"]}
retry_logic	{"on_ambiguity":"ask_clarification","fallback":"show_common_patterns"}
observability	{"entry_log":"Patterns skill activated","exit_log":"Patterns reference provided"}

JavaScript Patterns Skill

Quick Reference Card

Creational Patterns

Factory

function createUser(type) {
  const users = {
    admin: () => ({ role: 'admin', permissions: ['all'] }),
    user: () => ({ role: 'user', permissions: ['read'] })
  };
  return users[type]?.() ?? users.user();
}

Singleton

class Database {
  static #instance;

  static getInstance() {
    if (!Database.#instance) {
      Database.#instance = new Database();
    }
    return Database.#instance;
  }
}

Builder

class QueryBuilder {
  #query = { select: '*', from: '', where: [] };

  select(fields) { this.#query.select = fields; return this; }
  from() { .#query. = table;  ; }
  () { .#query..(condition);  ; }
  () {  .#query; }
}

 ()
  .()
  .()
  .()
  .();