A very common pattern is passing a function down to a child component as a prop, which can update the parent component's state, and then calling it within that child component. There are some powerful patterns which have emerged, due to the ability to pass functions as props. Anything can be passed as a prop in React (especially functions)Īny normal JavaScript value can be passed as props as well, including functions. Also, children are useful when you want to place a context provider from React context around your component tree to easily provide what is placed on context provider to all of its child components so they can receive the same data.ĥ.Children props are very helpful when you want to make a generic layout component and give the same layout to all of the components that are passed as children.This is especially helpful when we need to wrap one component around another, such as for styling, or to pass more component data to the children components to give two examples: The children prop allows us to compose our components in powerful ways. We receive any children for a given component if any components or elements are passed between the opening and closing tags of that component. In fact, there is a special type of prop that is automatically provided on the props object called children. Not only can JSX elements be passed as props to components, but we can also pass other components as props. This flexibility is also extended to what we can pass as a prop. We've seen that props are very flexible, and if we don't pass them to a component, an error will not be thrown. React components can be passed as props (including children) ![]() This cuts down on our code and eliminates the need to say props.propName to get each props value. ![]() You can use ES6 object destructuring to include a set of curly braces within your function component's parameters, and immediately grab the properties off of the object, as well as declare them as separate variables. However, if you only have a few props that you're passing down to your component, you can immediately destructure them within the parameters of your function component. If you have a lot of props that you're passing down to your component, it may be best to include them on the entire props object and access them by saying props.propName. Or they can be destructured, since props will always be an object, into separate variables. Props can be accessed as an entire object which is usually called "props". There are a couple of patterns we can use for accessing prop values in our components. React props can be accessed as an object or destructured Instead, you can just include the prop value, and it will be given the boolean value true when you use it in a component to which you pass it. There is no need to write that a prop is equal to true. If you just provide the proper name on a component with nothing else, you pass a boolean value of true for that prop to the component. React props passed with just their name have a value of trueĮvery prop must be given an associated value that is provided after the equals operator.īut what happens when we don't provide that equals operator as well as a value? Also you might not pass a certain prop to a component, if you so choose. In plain React, be aware that passing props can be something you forget to do. With prop-types or TypeScript, we can tell React the props we are passing for a given component, what their values should be, and whether they are optional. If you would like to be alerted to when a value is not passed as a prop to a component, you can use a tool like prop-types or TypeScript using these tools. Instead, within the component that prop will have a value of undefined. If prop values are not passed a certain component, an error will not be thrown. Props that are passed to components can be thought of like arguments that are passed to a function. It includes all of the essential information here as a convenient PDF guide. Let’s get started! Want Your Own Copy? □Ĭlick here to download the cheatsheet in PDF format(it takes 5 seconds). We will not only touch on what these patterns are and how to use them, but you'll see how to use them on your own through practical, real-world examples. ![]() In this tutorial, we will be reviewing ten patterns you should use when working with props in React. Props are a powerful tool to use in React, but how do you use them effectively to write robust, reliable React components and applications?
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