Usually, you'll see the FSM represented like this □: Let's represent the traffic light FSM on a graphic, so we can visualize the state transitions and understand how the machine works. The transition is a mapping that defines the path of our state. The state will change in response to an input, that in our case is a timer, through a transition. The initial state of the machine is □ green and whenever one of the lights is on the output of the other ones is off. Those scenarios are called states and because the set is limited to 3 states we can say that is finite. For the sake of this consider that our traffic light has 3 colors.Īt any point in time, the traffic light will be on one of the following scenarios: I'm sure that after reading the post you'll start pointing them in the real world, trust me I'm doing it right now □Ī traffic light □ is a simple example to understand FSM. The world is full of finite state machines, in fact, you are using them every day, but probably you didn't think of them as such. Now you're probably like wtf □, this sounds scary □ and academic, right? Let's try to illustrate this definition with a real world example to understand it better. s 0 : The initial state, an element of S.δ : The state-transition function ( δ: S x Σ -> S).The FSM can change from one state to another, this change is called a transition. Let's dive in! □ #What is a finite state machine?Ī finite state machine is an abstract machine that can be in exactly one of a finite number of states at any given time. In this article, I'm going to explain the benefits of composing user interfaces using finite state machines. Did you know that □□ SpaceX used JavaScript for the spaceship flight interface? □. Finite State Machines, often abbreviated as FSM is a mathematical computation model that could be useful for building user interfaces, especially nowadays that front-end apps are becoming much more complex due to the nature of the problems that they solve.
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