Bibliography Formatter Format multiple bibliography entries in APA, MLA, Chicago, or Harvard.

The tool works by first parsing input strings into individual entries using the `split` method with a regular expression that matches one or more newline characters followed by zero or more whitespace characters and then another newline character. This effectively splits the input into blocks separated by blank lines. Each entry is then further split into key-value pairs using another regular expression that matches a word followed by a colon or equals sign and then one or more characters, with the match groups used to populate an object representing the entry fields.

The `filter` method is used to remove any empty entries from the parsed list, ensuring only valid data is processed. The tool uses the React library's `useState` hook to store the current style and sort order in state variables, which are updated when the user interacts with the radio button controls. The `useCallback` hook is used to memoize the `onProcess` function, which is called whenever the input changes or the user updates the style or sort order.

The sorting algorithm uses the `sort` method and a compare function that depends on the current sort order, either comparing author names alphabetically, years in reverse chronological order, or titles alphabetically. The formatted output is generated using template strings and includes the style-specific formatting rules for APA, MLA, Chicago, and Harvard styles, with the `formatEntry` function applying these rules based on the entry type and fields present.

The tool's user interface is built using React components, including a custom `TextToolLayout` component that wraps the input and output areas, along with radio button controls for selecting the style and sort order. The browser's DOM API is used to render the formatted output in the page, with CSS styles applied to control the layout and appearance of the bibliography list. The use of specific technologies like React and JavaScript enables the tool to provide an interactive and dynamic user experience.