Reactivity and logic

4 lessons in the Vue course.

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• Reactive DataDeclare reactive state with ref and reactive so the UI updates when values change.
• MethodsGroup behavior in functions and call them from the template or other logic.
• Computed PropertiesDerive values that update automatically when their dependencies change.
• Conditionals and ListsShow UI with v-if / v-show and render collections with v-for and keys.