Why State machines with composables in Vue? - Purpose & Use Cases

The Big Idea

Discover how to tame complex app states with simple, clear rules using state machines and Vue composables!

The Scenario

Imagine building a form with multiple steps and conditions, where you manually track each step's state using separate variables and lots of if-else checks.

The Problem

Manually managing states quickly becomes confusing and error-prone as the app grows. You might forget to update some states or create conflicting conditions, leading to bugs and unpredictable behavior.

The Solution

State machines with composables let you define clear states and transitions in one place. This makes your app's behavior predictable and easier to manage, while Vue composables keep your code clean and reusable.

Before vs After

✗ Before

let step = 1;
if (step === 1) { /* show step 1 */ }
// many if-else checks scattered around

✓ After

const { state, send } = useStateMachine({ states: ['step1', 'step2'], transitions: { step1: { NEXT: 'step2' } } });
if (state.value === 'step1') { /* show step 1 */ }
send('NEXT');

What It Enables

You can build complex, reliable workflows that are easy to understand and maintain, even as your app grows.

Real Life Example

Think of a checkout process on an online store where each step (cart, address, payment, confirmation) is a state. State machines ensure users follow the right order without skipping or repeating steps.

Key Takeaways

Manual state tracking is confusing and error-prone.

State machines define clear states and transitions.

Composable state machines keep Vue code clean and reusable.