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Updated Immutable Data Stuctures Docs #9845

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Jul 6, 2017
Merged

Updated Immutable Data Stuctures Docs #9845

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951523a
updated immutable data structures section
kastentx Jun 4, 2017
c07b342
Merge pull request #1 from kastentx/immutable-edit
kastentx Jun 4, 2017
06290a3
improved immutable clarifications
kastentx Jun 7, 2017
fb0ddf8
changes to example immutable code
kastentx Jun 7, 2017
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4 changes: 3 additions & 1 deletion docs/docs/optimizing-performance.md
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Original file line number Diff line number Diff line change
Expand Up @@ -380,10 +380,12 @@ Although `y` was edited, since it's a reference to the same object as `x`, this
const SomeRecord = Immutable.Record({ foo: null });
const x = new SomeRecord({ foo: 'bar' });
const y = x.set('foo', 'baz');
const z = x.set('foo', 'bar');
x === y; // false
x === z; // true
```

In this case, since a new reference is returned when mutating `x`, we can safely assume that `x` has changed.
In this case, since a new reference is returned when mutating `x`, we can use a reference equality check `(x === y)` to verify that the new value stored in `y` is different than the original value stored in `x`.

Two other libraries that can help use immutable data are [seamless-immutable](https://github.com/rtfeldman/seamless-immutable) and [immutability-helper](https://github.com/kolodny/immutability-helper).

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