@squeep/translated-keyed-collections

Provide augmented Set and Map classes which translate keys before they are stored or referenced, allowing for such things as a Set of Buffer contents rather than a Set of Buffer object references.

The included BufferKeyTranslator provides an implementation which serializes Buffers (or hex-strings) to hex-strings for the internal representation, and returns the de-hexed Buffers.

API

• TranslatedSetFactory({ toKey, fromKey, toStringPrefix })
  Returns a class which extends Set to wrap all incoming and outgoing values with toKey() and fromKey(), respectively. The optional toStringPrefix string affects the toString() rendering of the class.

  const { BufferKeyTranslator, TranslatedSetFactory } = require('@squeep/translated-keyed-collections');
  const BufferSet = TranslatedSetFactory(BufferKeyTranslator);
  
  const bs = new BufferSet();
  
  const b1 = Buffer.from('squeep');
  const b2 = Buffer.from('squeep');
  
  bs.add(b1);
  bs.add(b2);
  
  console.log(bs.size); // 1

• TranslatedMapFactory({ toKey, fromKey, toStringPrefix }) Returns a class which extends Map to wrap all incoming and outgoing keys with toKey() and fromKey(), respectively. The optional toStringPrefix string affects the toString() rendering of the class.

  const { BufferKeyTranslator, TranslatedMapFactory } = require('@squeep/translated-keyed-collections');
  const BufferMap = TranslatedMapFactory(BufferKeyTranslator);
  
  const bm = new BufferMap();
  
  const b1 = Buffer.from('squeep');
  const b2 = Buffer.from('squeep');
  
  bm.set(b1, 'first');
  bm.set(b2, 'second');
  
  console.log(bm.get(b1)); // 'second'