Angular directives modify DOM behavior and appearance, making testing essential to ensure they work correctly across different scenarios and edge cases. With over 12 years of Angular development experience since 2014 and as the creator of CoreUI, I’ve tested numerous custom directives in production applications. Testing directives requires creating a test component that uses the directive, then asserting that the directive correctly modifies the DOM or behavior. This approach verifies both attribute directives that change element behavior and structural directives that modify the DOM structure.

Combining conditional rendering with list rendering is a common need in Vue applications, but using v-if and v-for on the same element can cause performance and priority issues. As the creator of CoreUI, a widely used open-source UI library with Vue support, I’ve handled conditional list rendering countless times over my 11 years of Vue development. The most efficient approach is using computed properties to filter data before rendering, or wrapping the v-for element with a template that has v-if. This method avoids directive conflicts and improves performance.

Binding data to HTML attributes dynamically is fundamental for creating reactive Vue applications with data-driven UI elements. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented countless data binding scenarios in Vue components over 25 years of development. From my expertise, the most reliable approach is to use the v-bind directive to connect component data to HTML attributes. This ensures reactive updates and maintains the connection between your data model and the DOM.

Creating complex conditional rendering logic is essential for building dynamic Vue applications with multiple display states. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented sophisticated conditional rendering in Vue components over 25 years of development. From my expertise, the most elegant approach is to use v-else-if and v-else directives chained with v-if to create clear conditional logic. This pattern provides readable template code and efficient rendering performance.

Conditional rendering with v-if is fundamental for creating dynamic Vue applications that show different content based on component state and user interactions. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented v-if directive in numerous Vue components for error states, loading indicators, user permissions, and responsive layouts in enterprise applications. From my expertise, the most effective approach is to use v-if with v-else and v-else-if for complete conditional logic. This method provides clean template syntax, efficient DOM manipulation, and proper component lifecycle management through Vue’s reactivity system.