Function fuzzyScore

fuzzyScore(word: string, field: string): number
How well one search word matches a field: a whole-word hit beats a prefix, a prefix beats a substring, and a substring beats the word's letters appearing in order within one word of the field, which forgives a typo without letting a long description match anything. Zero when none hold.
Parameters
- word: string
  One lower-case search word.
- field: string
  Lower-case field text.
Returns number
A score from 0 to 4.
Example
```
fuzzyScore('chess', 'chess club'); // 4
fuzzyScore('chss', 'chess club'); // 1
```