Components let you split the UI into independent, reusable pieces, and think about each piece in isolation.

The alternative is uncontrolled components, where form data is handled by the DOM itself.

For use$ since svelte is never going to support actions for components, i designed something that reminds React hooks that will in some ways replace this feature.

Another difference is that context in Svelte does not insert anything into the visual component tree. There is no <Context.Provider> element like in React

There is a killer feature of vDOM that Svelte has nothing to replace with. It is the ability to treat component hierarchy as an object.

Recoil defines a directed graph orthogonal to but also intrinsic and attached to your React tree.

In general it is recommended you handle forms in this "controlled" manner. In some cases it might make sense to manage the form state outside of Solid via refs. These "uncontrolled" forms can also work. Just be conscious of the difference as mixing approaches can lead to unexpected results.

MINIMALISTIC

React Native has also used this pattern in TouchableWithoutFeedback

However, in this case you would lose the possibility to render something in between. You are strictly coupled to the higher-order component's render method. If you need to add something in between of the currency components, you would have to do it in the higher-order component. It would be quite similar as you have done it previously by rendering the currency components straight away in the Amount component. If using a render prop component instead, you would be flexible in your composition.

For the sake of completeness, the following code demonstrates that the problem could be solved with a higher-order component (HOC) as well:

Since an uncontrolled component keeps the source of truth in the DOM, it is sometimes easier to integrate React and non-React code when using uncontrolled components.

The terms “controlled” and “uncontrolled” usually refer to form inputs, but they can also describe where any component’s data lives. Data passed in as props can be thought of as controlled (because the parent component controls that data). Data that exists only in internal state can be thought of as uncontrolled (because the parent can’t directly change it).

input.indeterminate = indeterminate

However, if more control is needed, you can pass any of these pieces of state as a prop (as indicated above) and that state becomes controlled. As soon as this.props[statePropKey] !== undefined, internally, downshift will determine its state based on your prop's value rather than its own internal state.

Popout

setState({isOpen: true}

You can control the following props by providing values for them. If you don't, react-select will manage them for you. value / onChange - specify the current value of the control menuIsOpen / onMenuOpen / onMenuClose - control whether the menu is open inputValue / onInputChange - control the value of the search input (changing this will update the available options) If you don't provide these props, you can set the initial value of the state they control: defaultValue - set the initial value of the control defaultMenuIsOpen - set the initial open value of the menu defaultInputValue - set the initial value of the search input

logProps