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55 lines
1.3 KiB
Markdown
55 lines
1.3 KiB
Markdown
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# SwissMap
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SwissMap is a hash table adapated from the "SwissTable" family of hash tables from [Abseil](https://abseil.io/blog/20180927-swisstables). It uses [AES](https://github.com/dolthub/maphash) instructions for fast-hashing and performs key lookups in parallel using [SSE](https://en.wikipedia.org/wiki/Streaming_SIMD_Extensions) instructions. Because of these optimizations, SwissMap is faster and more memory efficient than Golang's built-in `map`. If you'd like to learn more about its design and implementation, check out this [blog post](https://www.dolthub.com/blog/2023-03-28-swiss-map/) announcing its release.
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## Example
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SwissMap exposes the same interface as the built-in `map`. Give it a try using this [Go playground](https://go.dev/play/p/JPDC5WhYN7g).
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```go
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package main
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import "github.com/dolthub/swiss"
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func main() {
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m := swiss.NewMap[string, int](42)
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m.Put("foo", 1)
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m.Put("bar", 2)
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m.Iter(func(k string, v int) (stop bool) {
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println("iter", k, v)
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return false // continue
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})
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if x, ok := m.Get("foo"); ok {
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println(x)
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}
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if m.Has("bar") {
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x, _ := m.Get("bar")
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println(x)
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}
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m.Put("foo", -1)
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m.Delete("bar")
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if x, ok := m.Get("foo"); ok {
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println(x)
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}
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if m.Has("bar") {
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x, _ := m.Get("bar")
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println(x)
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}
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m.Clear()
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// Output:
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// iter foo 1
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// iter bar 2
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// 1
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// 2
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// -1
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}
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```
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