PorterStemFilter

Applies Porter stemming algorithm for English.

Import

import PorterStemFilter from 'dynamosearch/filters/PorterStemFilter';

Constructor

new PorterStemFilter()

No parameters required.

Example

const filter = new PorterStemFilter();
const tokens = filter.apply([
  { token: 'running', startOffset: 0, endOffset: 7, position: 0 },
  { token: 'runs', startOffset: 8, endOffset: 12, position: 1 },
  { token: 'ran', startOffset: 13, endOffset: 16, position: 2 },
  { token: 'runner', startOffset: 17, endOffset: 23, position: 3 },
]);
// [
//   { token: 'run', startOffset: 0, endOffset: 7, position: 0 },
//   { token: 'run', startOffset: 8, endOffset: 12, position: 1 },
//   { token: 'ran', startOffset: 13, endOffset: 16, position: 2 },
//   { token: 'runner', startOffset: 17, endOffset: 23, position: 3 }
// ]

Best For

• English text search
• Finding word variants
• Improving recall
• Reducing index size

See Also

• SnowballFilter - For multi-language stemming
• EnglishAnalyzer - Uses this filter