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== Agent in Elixir == [[File:Elixir.png|thumb|right|200px|Elixir programming language logo]] The `Agent` module in Elixir is a part of the `Concurrent` module that allows the creation and management of concurrent state. It provides a simple and efficient way to manage state within a single process or across multiple processes. === Creating an Agent === To create an agent, the `Agent.start_link/2` function is used. This function takes two arguments: the agent's initial state and an optional keyword list of options. ```elixir {:ok, agent} = Agent.start_link(fn -> initial_state end, name: :my_agent) ``` === Accessing Agent State === The state of an agent can be accessed using the `Agent.get/2` function. It takes two arguments: the agent and a function that receives the current state and returns a new state. ```elixir {:ok, state} = Agent.get(agent, fn current_state -> current_state end) ``` === Updating Agent State === The state of an agent can be updated using the `Agent.update/3` function. It takes three arguments: the agent, a function that receives the current state and returns a new state, and an optional timeout. ```elixir {:ok, new_state} = Agent.update(agent, fn current_state -> new_state end) ``` === Sending Messages to Agents === Agents can also receive messages using the `Agent.send/3` function. The function takes three arguments: the agent, a message, and an optional timeout. ```elixir {:ok, _} = Agent.send(agent, message) ``` === Error Handling === If an error occurs while executing a function within an agent, the error can be handled using the `Agent.get_and_update/3` function. This function takes three arguments: the agent, a function that receives the current state and returns a new state, and an optional timeout. ```elixir {:ok, new_state} = Agent.get_and_update(agent, fn current_state -> new_state end) ``` === Conclusion === Agents in Elixir provide a simple yet efficient way to manage state in concurrent programming. With their easy-to-use API, agents are a powerful tool for handling mutable state in functional programs. == See Also == * [[Concurrency in Elixir]] * [[Task in Elixir]]
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