Component names must start with a capital letter (that is, M圜omponent, instead of m圜omponent). We can organized groups of elements into React components.Ī basic function component is written similarly to a regular JavaScript function with a couple of differences. We can write fragments in a regular or shorthand syntax: or. If we don’t want to wrap our elements in a container element like a div, we can use a fragment: // valid syntax React requires that all returned elements be returned within a single “parent” component.įor example, we can’t return two sibling elements, like an h1 and a paragraph from a component: // this syntax is invalid React also gives us an element called a fragment. Inline styles are not written as plain strings, but as properties on objects: My header To apply inline styles, instead of using double quotes (“”), we use two sets of curly braces. The most common example is the class attribute, which we write as className. Since JSX is really JavaScript and JavaScript uses a camelcase naming convention (that is, “camelCase”), attributes are written differently than HTML. Note: Key is the only attributes that can be passed with the Fragments. 
If you need to provide keys, you have to declare the fragments with the explicit React.Fragment> syntax. You need a key for mapping a collection to an array of fragments such as to create a description list. They must end in a forward slash /: Īdditionally, JSX requires a different syntax for its attributes. The shorthand syntax does not accept key attributes. Unlike HTML, single-tag elements (like the img element), must be self-closing. However, because JSX is really just JavaScript functions (and not HTML), the syntax is a bit different. We write React elements using a feature called JSX. You can write any valid HTML element in React.
React elements are written just like regular HTML elements.
Add style to react fragment pdf#
It includes all of the essential information in this article as a convenient PDF guide. I’ve put together a super helpful cheatsheet to give you a complete overview of all of the React concepts you need to know in 2022.Ĭlick here to download the cheatsheet in PDF format. Do you want to get up to speed with React as quickly as possible?
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