Word Frequency in a Sentence

📌 Definition:

📖 Detailed Explanation:

Normalize (lowercase), strip punctuation, split on whitespace, then reduce into a counts object. Filter out empty tokens produced by multiple spaces.

💻 Solutions:

• JavaScript

function wordCount(sentence) {
  return sentence
    .toLowerCase()
    .replace(/[^a-z0-9\s]/g, '')
    .split(/\s+/)
    .filter(Boolean)
    .reduce((acc, w) => {
      acc[w] = (acc[w] || 0) + 1;
      return acc;
    }, {});
}

🔑 Key Points:

• Normalize case and strip punctuation before splitting
• split(/\s+/) + filter(Boolean) handles multiple/leading spaces
• reduce accumulates counts in one pass
• Consider a Map for very large vocabularies

🌍 Real-World Example: