Turn Your Text into Squared Unicode Letters Convert text to squared Unicode characters.

The tool works by utilizing React's useState and useCallback hooks to manage the filled state of the squares and process the input text. It uses JavaScript's Array.from method to generate arrays of Unicode characters for both outlined and filled square styles, with code points ranging from 0x1F130 to 0x1F149 for outlined uppercase letters and 0x1F170 to 0x1F189 for filled uppercase letters. The onProcess function iterates over each character in the input string, using the charCodeAt method to determine its Unicode code point and then mapping it to its corresponding squared equivalent based on the filled state.

When processing the input text, the tool checks if a character is an uppercase or lowercase letter by comparing its code point to the ranges 65-90 for uppercase letters and 97-122 for lowercase letters. If it's a letter, the tool returns the corresponding squared character from either the SQUARED_UPPER or FILLED_UPPER array, depending on the filled state. Non-letter characters are left unchanged and passed through to the output string. The resulting string of squared characters is then joined together using the join method and returned as the output.

The use of React's useCallback hook ensures that the onProcess function is only recreated when the filled state changes, which helps optimize performance by reducing unnecessary re-renders. The tool also relies on TypeScript for type checking and code safety, allowing developers to catch errors early in the development process. Additionally, the TextToolLayout component provides a standardized layout for the input field, output label, and checkbox, making it easier to integrate the tool into larger applications.