Introduction to State Machines Using XState
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Learn how state machines can simplify complex application management. Explore XState, JavaScript’s premier state machine library, and gain the skills to apply them effectively. Start your state machine education today!
The difficulty of managing state is one of the primary reasons our applications become so complex. We try and manage this complexity with a lot of booleans, somewhat semantic variables like
,
, and
, and over-engineered systems that are
full of bugs. Surely, there’s a better way.
That better way is
.
State machines formalize how we define and transition through the states of our application and give us ultimate control of the most complex parts of our apps.
In this course, we will explore the problems state machines purport to solve, like boolean explosion. We’ll try to solve it our own way first, get so far, and then demonstrate how state machines get us all the way. After that, we’ll dive into the XState library, JavaScript’s premiere state machine library, to learn its API and how to use it to solve our problems.
By the time you’re done taking this course, you should have a solid education about state machines and be able to start applying them.
Course Content
Course Intro and Overview
Eliminate Boolean Explosion by Enumerating States
Replace Enumerated States with a State Machine
Use an Interpreter to Instantiate a Machine
Use XState Viz to Visually Develop and Test Your Machine
Add Actions to Transitions to Fire Side Effects
Trigger Actions When Entering and Exiting a XState State
Replace Inline Functions with String Shorthands
Use Internal Transitions in XState to Avoid State Exit and Re-Entry
Send Events to the Machine with the XState Send Action Creator
Track Infinite States with with XState Context
How Action Order Affects Assigns to Context in a XState Machine
Use Activities in XState to Run Ongoing Side Effects
Conditionally Transition to States with Guards in XState
Simplify State Explosion in XState through Hierarchical States
Multiple Simultaneous States with Parallel States
Recall Previous States with XState History States Nodes
Use XState Null Events and Transient Transitions to Immediately Transition States
Delay XState Events and Transitions
Invoking a Promise for Asynchronous State Transitions in XState
Invoke Callbacks to Send and Receive Events from a Parent XState Machine
Invoke Child XState Machines from a Parent Machine
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