select row_to_json(t)
from (
select id, "email", "passwordHash", role from public."User"
) t
Select PosgreSQL as JSON
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ReactJS: Simple Contact App
Simple Contact App: ES6, Prop Validate, Data flow and Component Communication
ReactJS: Prop Validation
When creating components, remember that they can be composed into bigger components and reused (in the same project, in other projects, by other developers). Therefore, it is a good practice to make explicit in your components which props can be used, which ones are required, and which types of values they accept.
ReactJS: Working with form
In React, a component’s internal state is kept to minimum because every time the state changes, the component is rendered again. The purpose of this is to have an accurate representation of the component state in your JavaScript code and let React keep the interface in sync.
For this reason, form components such as <input>, <textarea>, and <option> differ from their HTML counterparts because they can be mutated via user interactions.