Unicode Code Point Lookup Unicode Code Point Lookup tool for network operations.

The tool works by using the `TextEncoder` API to convert input characters into UTF-8 bytes, which are then processed and displayed as a series of hexadecimal values. When handling Unicode codepoints, it employs the `String.fromCodePoint` method to generate the corresponding character representation. The `parseInt` function is used with base 16 to parse the input codepoint strings, such as those prefixed with "U+" or "0x". Error handling is implemented using try-catch blocks to catch and display any invalid input errors.

The tool's UI is built using React, which manages the state of the input field, results, and error messages through hooks like `useState` and `useCallback`. The `copyToClipboard` function utilizes browser APIs to copy specific values to the clipboard when the user clicks the corresponding button. The UTF-16 units are calculated based on the codepoint value, following the rules defined in the Unicode Standard for surrogate pairs. For instance, if a codepoint is greater than 0xFFFF, it calculates the high and low surrogates using bitwise operations and then formats them as hexadecimal strings.

The tool's data structures include arrays to store the input characters or codepoints, as well as objects to represent each character's information, such as its Unicode codepoint, UTF-8 bytes, and escape sequences. The `getUtf8Bytes` function returns a string of space-separated hexadecimal values representing the UTF-8 encoding of a given codepoint. Similarly, the `getUtf16Units` function generates a string representing the UTF-16 encoding, either as a single hexadecimal value for codepoints up to 0xFFFF or as a pair of surrogate values for higher codepoints.

The React components, including `InputWithHelp`, handle user input and display the results in a responsive layout that adapts to different screen sizes and devices. The tool's algorithms ensure accurate conversions between characters, Unicode codepoints, and their various representations, providing detailed information for each input character or codepoint. This includes HTML entities, CSS escape sequences, and JavaScript escape sequences, which can be directly copied to the clipboard using the provided buttons.

The use of React hooks like `useCallback` helps optimize performance by memoizing functions that do not change between renders, reducing unnecessary recalculations and improving overall efficiency. The tool's reliance on browser APIs and client-side JavaScript ensures privacy and security by avoiding any server-side data transmission. By following web standards and using modern JavaScript features, the tool maintains a high level of compatibility across different browsers and devices.