Vue.js setup() Hook

Organize reactive state, computed values, methods, and lifecycle hooks with Vue's setup function.

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Entry point for Composition API: Central hub in Vue 3 for defining component logic, replacing or complementing Options API.
Creates reactive state: Uses ref or reactive to define data that triggers UI updates on changes.
Sets up computed properties: Defines memoized, reactive values with computed for efficient dependency updates.
Defines methods: Declares functions for component logic or event handling within setup().
Handles lifecycle hooks: Supports hooks like onMounted or onUnmounted for lifecycle-specific code.
Runs before component creation: Executes before beforeCreate and created hooks to initialize logic.
Promotes modular code: Enables reusable, organized logic via composables for better maintainability.

Also see.