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Coding Patterns and Best Practices

Efficiency Considerations

It is the goal of NowJS to make the shared namespaces as carefree and easy to use as possible. However, if your application is running slowly or you are coding with performance in mind, here are a few considerations.

  1. Avoid deeply nested structures inside the now namespace Setting or modifying variables that lie inside multiple levels of nested objects and arrays is inefficient. NowJS must traverse these deep structures to watch for changes, serialize the structure when a value is changed, deserialize it on the receiving end, and traverse it again to merge the changes on the receiving end. Keep your structures at most 2-3 levels deep.

  2. Sync values using remote function calls rather than using synced variables. As described above, some amount of traversal is required to synchronize variables in the now namespace. If you need to rapidly set a value on one client and then immediately use that value on the other clients, consider broadcasting this using function calls. Function calls are much faster than using variable syncing.

  3. The Internet will always be slower than the local machine We try to make remote functions and variables as natural to use as local ones. But the reality is that the latency for any remote action is 6 orders of magnitude longer than the same action done locally. Try to execute things locally when possible.

Further Reading

Now that you've read the Best Practices guide, try the NowJS User Manual and Quick Start

Have more questions? You can reach us in #nowjs on freenode