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third_party/polymer/v0_8/components-chromium/observe-js/README.md

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-[![Build status](http://www.polymer-project.org/build/observe-js/status.png "Build status")](http://build.chromium.org/p/client.polymer/waterfall) [![Analytics](https://ga-beacon.appspot.com/UA-39334307-2/Polymer/observe-js/README)](https://github.com/igrigorik/ga-beacon)
-
-## Learn the tech
-
-### Why observe-js?
-
-observe-js is a library for observing changes in JavaScript data. It exposes a high-level API and uses [Object.observe](https://github.com/arv/ecmascript-object-observe) if available, and otherwise performs dirty-checking. observe-js requires ECMAScript 5.
-
-### Observable
-
-observe-js implements a set of observers (PathObserver, ArrayObserver, ObjectObserver, CompoundObserver, ObserverTransform) which all implement the Observable interface:
-
-```JavaScript
-{
-  // Begins observation. Value changes will be reported by invoking |changeFn| with |opt_receiver| as
-  // the target, if provided. Returns the initial value of the observation.
-  open: function(changeFn, opt_receiver) {},
-
-  // Report any changes now (does nothing if there are no changes to report).
-  deliver: function() {},
-
-  // If there are changes to report, ignore them. Returns the current value of the observation.
-  discardChanges: function() {},
-
-  // Ends observation. Frees resources and drops references to observed objects.
-  close: function() {}
-}
-```
-
-### PathObserver
-
-PathObserver observes a "value-at-a-path" from a given object:
-
-```JavaScript
-var obj = { foo: { bar: 'baz' } };
-var observer = new PathObserver(obj, 'foo.bar');
-observer.open(function(newValue, oldValue) {
-  // respond to obj.foo.bar having changed value.
-});
-```
-
-PathObserver will report a change whenever the value obtained by the corresponding path expression (e.g. `obj.foo.bar`) would return a different value.
-
-PathObserver also exposes a `setValue` method which attempts to update the underlying value. Setting the value does not affect notification state (in other words, a caller sets the value but does not `discardChanges`, the `changeFn` will be notified of the change).
-
-```JavaScript
-observer.setValue('boo');
-assert(obj.foo.bar == 'boo');
-```
-
-Notes:
- * If the path is ever unreachable, the value is considered to be `undefined`.
- * If the path is empty (e.g. `''`), it is said to be the empty path and its value is its root object.
- * PathObservation respects values on the prototype chain
-
-### ArrayObserver
-
-ArrayObserver observes the index-positions of an Array and reports changes as the minimal set of "splices" which would have had the same effect.
-
-```JavaScript
-var arr = [0, 1, 2, 4];
-var observer = new ArrayObserver(arr);
-observer.open(function(splices) {
-  // respond to changes to the elements of arr.
-  splices.forEach(function(splice) {
-    splice.index; // index position that the change occurred.
-    splice.removed; // an array of values representing the sequence of elements which were removed
-    splice.addedCount; // the number of elements which were inserted.
-  });
-});
-```
-
-ArrayObserver also exposes a utility function: `applySplices`. The purpose of `applySplices` is to transform a copy of an old state of an array into a copy of its current state, given the current state and the splices reported from the ArrayObserver.
-
-```JavaScript
-AraryObserver.applySplices = function(previous, current, splices) { }
-```
-
-### ObjectObserver
-
-ObjectObserver observes the set of own-properties of an object and their values.
-
-```JavaScript
-var myObj = { id: 1, foo: 'bar' };
-var observer = new ObjectObserver(myObj);
-observer.open(function(added, removed, changed, getOldValueFn) {
-  // respond to changes to the obj.
-  Object.keys(added).forEach(function(property) {
-    property; // a property which has been been added to obj
-    added[property]; // its value
-  });
-  Object.keys(removed).forEach(function(property) {
-    property; // a property which has been been removed from obj
-    getOldValueFn(property); // its old value
-  });
-  Object.keys(changed).forEach(function(property) {
-    property; // a property on obj which has changed value.
-    changed[property]; // its value
-    getOldValueFn(property); // its old value
-  });
-});
-```
-
-### CompoundObserver
-
-CompoundObserver allows simultaneous observation of multiple paths and/or Observables. It reports any and all changes in to the provided `changeFn` callback.
-
-```JavaScript
-var obj = {
-  a: 1,
-  b: 2,
-};
-
-var otherObj = { c: 3 };
-
-var observer = new CompoundObserver();
-observer.addPath(obj, 'a');
-observer.addObserver(new PathObserver(obj, 'b'));
-observer.addPath(otherObj, 'c');
-observer.open(function(newValues, oldValues) {
-  // Use for-in to iterte which values have changed.
-  for (var i in oldValues) {
-    console.log('The ' + i + 'th value changed from: ' + newValues[i] + ' to: ' + oldValues[i]);
-  }
-});
-```
-
-
-### ObserverTransform
-
-ObserverTransform is used to dynamically transform observed value(s).
-
-```JavaScript
-var obj = { value: 10 };
-var observer = new PathObserver(obj, 'value');
-function getValue(value) { return value * 2 };
-function setValue(value) { return value / 2 };
-
-var transform = new ObserverTransform(observer, getValue, setValue);
-
-// returns 20.
-transform.open(function(newValue, oldValue) {
-  console.log('new: ' + newValue + ', old: ' + oldValue);
-});
-
-obj.value = 20;
-transform.deliver(); // 'new: 40, old: 20'
-transform.setValue(4); // obj.value === 2;
-```
-
-ObserverTransform can also be used to reduce a set of observed values to a single value:
-
-```JavaScript
-var obj = { a: 1, b: 2, c: 3 };
-var observer = new CompoundObserver();
-observer.addPath(obj, 'a');
-observer.addPath(obj, 'b');
-observer.addPath(obj, 'c');
-var transform = new ObserverTransform(observer, function(values) {
-  var value = 0;
-  for (var i = 0; i < values.length; i++)
-    value += values[i]
-  return value;
-});
-
-// returns 6.
-transform.open(function(newValue, oldValue) {
-  console.log('new: ' + newValue + ', old: ' + oldValue);
-});
-
-obj.a = 2;
-obj.c = 10;
-transform.deliver(); // 'new: 14, old: 6'
-```
-
-### Path objects
-
-A path is an ECMAScript expression consisting only of identifiers (`myVal`), member accesses (`foo.bar`) and key lookup with literal values (`arr[0]` `obj['str-value'].bar.baz`).
-
-`Path.get('foo.bar.baz')` returns a Path object which represents the path. Path objects have the following API:
-
-```JavaScript
-{
-  // Returns the current value of the path from the provided object. If eval() is available, a compiled getter will be
-  // used for better performance.
-  getValueFrom: function(obj) { }
-
-
-  // Attempts to set the value of the path from the provided object. Returns true IFF the path was reachable and
-  // set.
-  setValueFrom: function(obj, newValue) { }
-}
-```
-
-Path objects are interned (e.g. `assert(Path.get('foo.bar.baz') === Path.get('foo.bar.baz'));`) and are used internally to avoid excessive parsing of path strings. Observers which take path strings as arguments will also accept Path objects.
-
-## About delivery of changes
-
-observe-js is intended for use in environments which implement Object.observe, but it supports use in environments which do not.
-
-If `Object.observe` is present, and observers have changes to report, their callbacks will be invoked at the end of the current turn (microtask). In a browser environment, this is generally at the end of an event.
-
-If `Object.observe` is absent, `Platform.performMicrotaskCheckpoint()` must be called to trigger delivery of changes. If `Object.observe` is implemented, `Platform.performMicrotaskCheckpoint()` has no effect.