Updated Immutable Data Stuctures Docs (#9845)
* updated immutable data structures section * improved immutable clarifications * changes to example immutable code
Nick Kasten committed
Jul 5, 2017 at 19:08 UTC
8f4d30737def9fa3456149826414643b5cbbe4bf
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docs/docs/optimizing-performance.md
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@@ -380,10 +380,12 @@ Although `y` was edited, since it's a reference to the same object as `x`, this
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const SomeRecord = Immutable.Record({ foo: null });
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const x = new SomeRecord({ foo: 'bar' });
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const y = x.set('foo', 'baz');
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+const z = x.set('foo', 'bar');
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x === y; // false
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+x === z; // true
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```
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-In this case, since a new reference is returned when mutating `x`, we can safely assume that `x` has changed.
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+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`.
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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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