Automated Readability Index Calculator Calculate the Automated Readability Index using character counts.

The Automated Readability Index calculation is performed using a formula that takes into account the number of characters, words, and sentences in the input text. This formula, 4.71×(chars/words) + 0.5×(words/sentences) − 21.43, is implemented in the code using JavaScript and React. The `onProcess` function uses regular expressions to split the input text into words and sentences, and then calculates the character count by removing non-alphanumeric characters from the text. The word count is calculated by splitting the text into words using one or more whitespace characters as the delimiter, and then filtering out any empty strings.

The sentence count is calculated by splitting the text into sentences using one or more punctuation characters as the delimiter, and then filtering out any empty strings. The character count is then used to calculate the average number of characters per word, which is a key factor in determining the readability score. The `useCallback` hook from React is used to memoize the `onProcess` function, so that it is not recreated on every render. The result is then formatted into a string using template literals, and includes the ARI score, grade level, age range, and statistical breakdown.

The code uses a Record data structure to map the calculated grade level to a specific age range, with 14 possible grade levels mapped to corresponding age ranges. The `Math.min` function is used to clamp the calculated grade level to a maximum of 14, which corresponds to a college level. The `TextToolLayout` component from the `@/components/shared` module is used to render the input text area and output label, and the `onProcess` function is passed as a prop to this component. The result is a fast and deterministic calculation that produces an accurate readability score.