When should I use curly braces { } and quotes "" in React?

In React, when passing properties to a component, you can pass them in two different ways: using curly brackets or using quotes. Let's explore the differences and when to use each method:

Quotes (String Literal)

When you pass a property using quotes, it is considered a string literal. The value of the property will be interpreted as a string. Here's an example:

<MyComponent prop="value" />

In this example, the value of prop is the string "value". It is not evaluated as JavaScript code but treated as a static value.

Use quotes when you want to pass a static value or a string literal to the component, such as a constant value, a string, or a predefined value that doesn't change.

Curly Brackets (JSX Expression)

When you pass a property using curly brackets, it is considered a JavaScript expression. This means that you can dynamically compute the value of the property based on JavaScript code. Here's an example:

const userName = "John Doe";
const image = "/avatars/john_doe.jpg";

return (
   <User name={userName} avatar={image} />
)

In this example, value is a JavaScript variable that can be computed or changed dynamically. The value of name and avatar properties will be determined by the current value of userName and image when the component renders.

You can also pass an object to property:

<MyComponent style={{color: 'green'}} />

Since the value in curly braces considered a JavaScript expression, you can pass a string literal using curly braces also:

<User name={'John Doe'} />

I recommend using curly braces anyway, whether you want to pass a string literal or a JavaScript expression.