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Go Patterns
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Creational Patterns
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Abstract Factory
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Factory Method
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Object Pool
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Singleton
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Structural Patterns
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Bridge
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Composite
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Decorator
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Facade
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Flyweight
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Proxy
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<a href="../#behavioral-patterns">
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Behavioral Patterns
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<ul class="articles">
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<li class="chapter " data-level="1.1.3.1" data-path="../behavioral/chain_of_responsibility.md">
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Chain of Responsibility
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</a>
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<li class="chapter " data-level="1.1.3.2" data-path="../behavioral/command.md">
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Command
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<span>
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Mediator
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<span>
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Memento
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Observer
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<li class="chapter " data-level="1.1.3.6" data-path="../behavioral/registry.md">
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<span>
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Registry
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</a>
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<li class="chapter " data-level="1.1.3.7" data-path="../behavioral/state.md">
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<span>
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State
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</a>
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</li>
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<li class="chapter " data-level="1.1.3.8" data-path="../behavioral/strategy.html">
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<a href="../behavioral/strategy.html">
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Strategy
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</a>
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</li>
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<li class="chapter " data-level="1.1.3.9" data-path="../behavioral/template.md">
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<span>
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Template
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</a>
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</li>
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<li class="chapter " data-level="1.1.3.10" data-path="../behavioral/visitor.md">
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<span>
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Visitor
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.4" data-path="../">
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<a href="../#synchronization-patterns">
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Synchronization Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.4.1" data-path="../synchronization/condition_variable.md">
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<span>
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Condition Variable
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.2" data-path="../synchronization/mutex.md">
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<span>
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Lock/Mutex
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.3" data-path="../synchronization/monitor.md">
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<span>
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Monitor
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.4" data-path="../synchronization/read_write_lock.md">
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<span>
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Read-Write Lock
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.5" data-path="../synchronization/semaphore.html">
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<a href="../synchronization/semaphore.html">
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Semaphore
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.5" data-path="../">
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<a href="../#concurrency-patterns">
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Concurrency Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.5.1" data-path="../concurrency/barrier.md">
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<span>
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N-Barrier
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.2" data-path="../concurrency/bounded_parallelism.html">
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<a href="../concurrency/bounded_parallelism.html">
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Bounded Parallelism
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.3" data-path="../concurrency/broadcast.md">
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<span>
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Broadcast
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.4" data-path="../concurrency/coroutine.md">
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<span>
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Coroutines
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.5" data-path="../concurrency/generator.html">
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<a href="../concurrency/generator.html">
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Generators
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.6" data-path="../concurrency/reactor.md">
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<span>
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Reactor
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.7" data-path="../concurrency/parallelism.html">
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<a href="../concurrency/parallelism.html">
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Parallelism
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.8" data-path="../concurrency/producer_consumer.md">
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<span>
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Producer Consumer
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.6" data-path="../">
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<a href="../#messaging-patterns">
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Messaging Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.6.1" data-path="../messaging/fan_in.html">
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<a href="../messaging/fan_in.html">
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Fan-In
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.2" data-path="../messaging/fan_out.html">
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<a href="../messaging/fan_out.html">
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Fan-Out
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.3" data-path="../messaging/futures_promises.md">
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<span>
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Futures & Promises
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.4" data-path="../messaging/publish_subscribe.html">
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<a href="../messaging/publish_subscribe.html">
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Publish/Subscribe
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.5" data-path="../messaging/push_pull.md">
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<span>
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Push & Pull
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.7" data-path="../">
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<a href="../#stability-patterns">
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Stability Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.7.1" data-path="../stability/bulkhead.md">
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<span>
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Bulkheads
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.2" data-path="../stability/circuit-breaker.html">
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<a href="../stability/circuit-breaker.html">
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Circuit-Breaker
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.3" data-path="../stability/deadline.md">
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<span>
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Deadline
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.4" data-path="../stability/fail_fast.md">
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<span>
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Fail-Fast
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.5" data-path="../stability/handshaking.md">
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<span>
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Handshaking
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.6" data-path="../stability/steady_state.md">
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Steady-State
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Profiling Patterns
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Timing Functions
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Cascading Failures
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Singleton</a>
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<section class="normal markdown-section">
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<h1 id="singleton-pattern">Singleton Pattern</h1>
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<p>Singleton creational design pattern restricts the instantiation of a type to a single object.</p>
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<h2 id="implementation">Implementation</h2>
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<pre><code class="lang-go"><span class="hljs-keyword">package</span> singleton
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<span class="hljs-keyword">type</span> singleton <span class="hljs-keyword">map</span>[<span class="hljs-keyword">string</span>]<span class="hljs-keyword">string</span>
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<span class="hljs-keyword">var</span> (
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once sync.Once
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instance singleton
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)
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<span class="hljs-keyword">func</span> New() singleton {
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once.Do(<span class="hljs-keyword">func</span>() {
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instance = <span class="hljs-built_in">make</span>(singleton)
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})
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<span class="hljs-keyword">return</span> instance
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}
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</code></pre>
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<h2 id="usage">Usage</h2>
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<pre><code class="lang-go">s := singleton.New()
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s[<span class="hljs-string">"this"</span>] = <span class="hljs-string">"that"</span>
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s2 := singleton.New()
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fmt.Println(<span class="hljs-string">"This is "</span>, s2[<span class="hljs-string">"this"</span>])
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<span class="hljs-comment">// This is that</span>
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</code></pre>
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<h2 id="rules-of-thumb">Rules of Thumb</h2>
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<ul>
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<li>Singleton pattern represents a global state and most of the time reduces testability.</li>
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</ul>
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