Word Count

How computers calculate word counts from raw text strings: Naive Tokenization (Vulnerable to Errors): Splitting simply by a single space (`text.split(' ')`) fails whenever text contains multiple consecutive spaces, tab characters, or trailing newlines, creating dozens of empty false-word tokens. Production Regex Tokenization: Modern algorithms normalize whitespace and split on contiguous non-whitespace sequences: ```javascript const words = text.trim().split(/\s+/).filter(Boolean).length; ``` Unicode-Aware International Tokenization: For multi-language applications including languages without explicit space delimiters (such as Chinese, Japanese, and Thai), modern applications employ the ECMAScript Internationalization API (`Intl.Segmenter`): ```javascript const segmenter = new Intl.Segmenter('en', { granularity: 'word' }); const segments = [...segmenter.segment(text)]; const words = segments.filter(s => s.isWordLike).length; ```

Standard word count expectations across professional writing domains:

A production-grade text analysis function returning words, characters, sentences, paragraphs, and reading time:

export interface TextMetrics {
  words: number;
  charactersWithSpaces: number;
  charactersNoSpaces: number;
  sentences: number;
  paragraphs: number;
  readingTimeMinutes: number;
}

export function analyzeTextMetrics(text: string): TextMetrics {
  const clean = text.trim();
  if (!clean) {
    return { words: 0, charactersWithSpaces: 0, charactersNoSpaces: 0, sentences: 0, paragraphs: 0, readingTimeMinutes: 0 };
  }

  const words = clean.split(/\s+/).filter(Boolean).length;
  const charactersWithSpaces = text.length;
  const charactersNoSpaces = text.replace(/\s/g, '').length;
  const sentences = clean.split(/[.!?]+/).filter(s => s.trim().length > 0).length;
  const paragraphs = clean.split(/\n+/).filter(p => p.trim().length > 0).length;
  const readingTimeMinutes = Math.ceil(words / 200);

  return {
    words,
    charactersWithSpaces,
    charactersNoSpaces,
    sentences,
    paragraphs,
    readingTimeMinutes
  };
}