2020-03-30 04:10:13 +08:00
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# 0.3
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## Highlights
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2020-03-31 04:41:23 +08:00
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- **Multi-Document Parsing:** Read a bundle of JSON documents (ndjson) 2-4x faster than doing it
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2020-03-31 00:00:59 +08:00
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individually. [API docs](https://github.com/simdjson/simdjson/blob/master/doc/basics.md#newline-delimited-json-ndjson-and-json-lines) / [Design Details](https://github.com/simdjson/simdjson/blob/master/doc/parse_many.md)
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2020-03-31 04:41:23 +08:00
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- **Simplified API:** The API has been completely revamped for ease of use, including a new JSON
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navigation API and fluent support for error code *and* exception styles of error handling with a
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single API. [Docs](https://github.com/simdjson/simdjson/blob/master/doc/basics.md#the-basics-loading-and-parsing-json-documents)
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- **Exact Float Parsing:** Now simdjson parses floats flawlessly *without* any performance loss,
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2020-03-30 04:10:13 +08:00
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thanks to [great work by @michaeleisel and @lemire](https://github.com/simdjson/simdjson/pull/558).
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[Blog Post](https://lemire.me/blog/2020/03/10/fast-float-parsing-in-practice/)
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- **Even Faster:** The fastest parser got faster! With a [shiny new UTF-8 validator](https://github.com/simdjson/simdjson/pull/387)
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and meticulously refactored SIMD core, simdjson 0.3 is 15% faster than before, running at 2.5 GB/s
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(where 0.2 ran at 2.2 GB/s).
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## Minor Highlights
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- Fallback implementation: simdjson now has a non-SIMD fallback implementation, and can run even on
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very old 64-bit machines.
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- Automatic allocation: as part of API simplification, the parser no longer has to be preallocated--
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it will adjust automatically when it encounters larger files.
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- Runtime selection API: We've exposed simdjson's runtime CPU detection and implementation selection
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as an API, so you can tell what implementation we detected and test with other implementations.
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2020-03-31 04:41:23 +08:00
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- Error handling your way: Whether you use exceptions or check error codes, simdjson lets you handle
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errors in your style. APIs that can fail return simdjson_result<T>, letting you check the error
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code before using the result. But if you are more comfortable with exceptions, skip the error code
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and cast straight to T, and exceptions will be thrown automatically if an error happens. Use the
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same API either way!
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- Error chaining: We also worked to keep non-exception error-handling short and sweet. Instead of
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having to check the error code after every single operation, now you can *chain* JSON navigation
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calls like looking up an object field or array element, or casting to a string, so that you only
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have to check the error code once at the very end.
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