Why Must ReactJS Component Names Start with a Capital Letter?

ReactJS Component Names: Capitalization Requirements

ReactJS, a popular front-end framework, enforces a specific naming convention for components: they must begin with capital letters. As the provided example demonstrates, lower-case component names result in rendering errors.

This requirement stems from the fact that in JSX, the syntax for creating React components resembles HTML tags. However, lower-case tag names are reserved for HTML elements, while those beginning with capital letters are treated as React components.

The reason for this distinction lies in the createElement API used by JSX. Different conventions are applied depending on the casing of the tag:

• Lower-case tag names without a dot (e.g., "") are interpreted as HTML elements and compiled as React.createElement('component').
• Lower-case tag names with a dot (e.g., "") are considered dynamic property accessors and compiled as React.createElement(obj.component).
• Capitalized tag names (e.g., "") are recognized as React components and compiled as React.createElement(Component).

By adhering to this capitalization rule, you ensure that your ReactJS components are properly identified and rendered as expected.

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