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Immutable.js provides several conversion methods to migrate one structure to another. Each Immutable.js class contains a prefixed "to" method like Map.toList(), Map.toSet(), etc. Converting these types sometimes results in a loss of data, as we will see when converting from Map to List.
Map to List:
it(‘should convert Map() to List()‘, () => { const map = Immutable.Map({ key1: ‘First Item‘, key2: ‘Second Item‘ }); const convertedList = map.toList(); expect(Immutable.List.isList(convertedList)).to.be.true; // Keys are discarded expect(convertedList.first()).to.equal(‘First Item‘); expect(convertedList.last()).to.equal(‘Second Item‘); });
List to Map:
it(‘should convert List() to Map()‘, () => { const list = Immutable.List.of(‘First Item‘, ‘Second Item‘); const convertedMap = list.toMap(); // Converted keys ascend numerically keys = convertedMap.keys(); expect(keys.next().value).to.equal(0); expect(keys.next().value).to.equal(1); expect(Immutable.Map.isMap(convertedMap)).to.be.true; expect(convertedMap.first()).to.equal(‘First Item‘); expect(convertedMap.last()).to.equal(‘Second Item‘); });
Map to Javascript Array:
it(‘should convert Map() to Javascript Array‘, () => { const map = Immutable.Map({ key1: ‘First Item‘, key2: ‘Second Item‘, key3: {key4: ‘Nested Item‘} }); const arr = map.toArray(); // Keys are discarded expect(arr[0]).to.equal(‘First Item‘); expect(arr[1]).to.equal(‘Second Item‘); expect(arr[2].key4).to.equal(‘Nested Item‘); });
Map to JSON:
it(‘should convert Map() to JSON‘, () => { const map = Immutable.Map({ key1: ‘First Item‘, key2: ‘Second Item‘, key3: {key4: ‘Nested Item‘} }); const json = map.toJSON(); expect(json.key1).to.equal(‘First Item‘); expect(json.key2).to.equal(‘Second Item‘); expect(json.key3.key4).to.equal(‘Nested Item‘); });
[Immutable.js] Converting Immutable.js Structures to Javascript and other Immutable Types
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原文地址：http://www.cnblogs.com/Answer1215/p/5206016.html
