On any host where the test passes (returns a value of True), Ansible runs that task. When you run the task or playbook, Ansible evaluates the test for all hosts. The when clause is a raw Jinja2 expression without double curly braces (see group_by_module). Create the task, then add a when statement that applies a test. The simplest conditional statement applies to a single task. Selecting files and templates based on factsĪnsible_facts Selecting variables, files, or templates based on facts You can find more examples of supported conditionals at. There are many options to control execution flow in Ansible. Controlling how Ansible behaves: precedence rules.Virtualization and Containerization Guides.Protecting sensitive data with Ansible vault.Playbook Example: Continuous Delivery and Rolling Upgrades.Discovering variables: facts and magic variables.Working with language-specific version managers.Controlling where tasks run: delegation and local actions.for the v-on: click event) or colon-notation for bindings (:src). Knowing these options give you more tools, and you’ll be able to write better code because of it.įor all versions above Vue 2.6, a shorthand notation for slots has been introduced that can be used for events (e. Vue gives us a lot of options in choosing how to dynamically add and remove CSS classes based on what’s going on in our application. We do this to show a button is disabled, to animate elements like loading spinners and a ton of other things. CSS is the thing that really makes our apps shine, and is very powerful in its own right.Ī very common pattern in web apps is to add and remove classes from elements based on the state of our application. Vue incorporates HTML and Javascript together in a really beautiful way, but we can’t forget about CSS. Overall, JSX gives you the power to do whatever you want to as it gives access to the full programmatic powers of JavaScript.Ĭustomize what input event the v-model listens for, and what property is used as the value for the v-model JSX also gives access to the spread operator, it makes things, like passing an object as props, easier. It couples logic and markup together, you don’t have to write markup separately from the JavaScript - and JSX offers the ability to write several components in a single file as opposed to templates where you have to write every component in separate files. Why would you want to use JSX in your Vue project?įor starters, it makes absolutely no assumption about how your code should look or be processed - there is no defined way to write JSX JSX also helps prevent cross-site scripting attacks because you can never inject code that is not explicitly written in your application, everything is converted to a string before being rendered.Īdditionally, there is no registration of imported components, you can make use of them on the go. However, be careful when you wrap stateful components with functional components, as functional components are always re-rendered and will cause stateful components to be re-rendered as well. The benefit of functional components is they are much cheaper to re-render than stateful components. Two examples of functional component syntax in Vue
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