前端代码

node_modules/immutable/contrib/cursor/README.md

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+Cursors
+-------
+
+Cursors allow you to hold a reference to a path in a nested immutable data
+structure, allowing you to pass smaller sections of a larger nested
+collection to portions of your application while maintaining a central point
+aware of changes to the entire data structure: an `onChange` function which is
+called whenever a cursor or sub-cursor calls `update`.
+
+This is particularly useful when used in conjuction with component-based UI
+libraries like [React](http://facebook.github.io/react/) or to simulate
+"state" throughout an application while maintaining a single flow of logic.
+
+
+```javascript
+var Immutable = require('immutable');
+var Cursor = require('immutable/contrib/cursor');
+
+var data = Immutable.fromJS({ a: { b: { c: 1 } } });
+var cursor = Cursor.from(data, ['a', 'b'], newData => {
+  data = newData;
+});
+
+// ... elsewhere ...
+
+cursor.get('c'); // 1
+cursor = cursor.update('c', x => x + 1);
+cursor.get('c'); // 2
+
+// ... back to data ...
+
+data.getIn(['a', 'b', 'c']); // 2
+```