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# The Tengo Language
[](https://godoc.org/github.com/d5/tengo/script)
[](https://goreportcard.com/report/github.com/d5/tengo)
[](https://travis-ci.org/d5/tengo)
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[](https://sourcegraph.com/github.com/d5/tengo?badge)
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**Tengo is a small, dynamic, fast, secure script language for Go.**
Tengo is ** [fast ](#benchmark )** and secure because it's compiled/executed as bytecode on stack-based VM that's written in native Go.
```golang
/* The Tengo Language */
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fmt := import("fmt")
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each := func(seq, fn) {
for x in seq { fn(x) }
}
sum := func(init, seq) {
each(seq, func(x) { init += x })
return init
}
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fmt.println(sum(0, [1, 2, 3])) // "6"
fmt.println(sum("", [1, 2, 3])) // "123"
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```
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> Run this code in the [Playground](https://tengolang.com/?s=0c8d5d0d88f2795a7093d7f35ae12c3afa17bea3)
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## Features
- Simple and highly readable [Syntax ](https://github.com/d5/tengo/blob/master/docs/tutorial.md )
- Dynamic typing with type coercion
- Higher-order functions and closures
- Immutable values
- Garbage collection
- [Securely Embeddable ](https://github.com/d5/tengo/blob/master/docs/interoperability.md ) and [Extensible ](https://github.com/d5/tengo/blob/master/docs/objects.md )
- Compiler/runtime written in native Go _(no external deps or cgo)_
- Executable as a [standalone ](https://github.com/d5/tengo/blob/master/docs/tengo-cli.md ) language / REPL
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- Use cases: rules engine, [state machine ](https://github.com/d5/go-fsm ), [gaming ](https://github.com/d5/pbr ), data pipeline, [transpiler ](https://github.com/d5/tengo2lua )
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## Benchmark
| | fib(35) | fibt(35) | Type |
| :--- | ---: | ---: | :---: |
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| Go | `48ms` | `3ms` | Go (native) |
| [**Tengo** ](https://github.com/d5/tengo ) | `2,349ms` | `5ms` | VM on Go |
| Lua | `1,416ms` | `3ms` | Lua (native) |
| [go-lua ](https://github.com/Shopify/go-lua ) | `4,402ms` | `5ms` | Lua VM on Go |
| [GopherLua ](https://github.com/yuin/gopher-lua ) | `4,023ms` | `5ms` | Lua VM on Go |
| Python | `2,588ms` | `26ms` | Python (native) |
| [starlark-go ](https://github.com/google/starlark-go ) | `11,126ms` | `6ms` | Python-like Interpreter on Go |
| [gpython ](https://github.com/go-python/gpython ) | `15,035ms` | `4ms` | Python Interpreter on Go |
| [goja ](https://github.com/dop251/goja ) | `5,089ms` | `5ms` | JS VM on Go |
| [otto ](https://github.com/robertkrimen/otto ) | `68,377ms` | `11ms` | JS Interpreter on Go |
| [Anko ](https://github.com/mattn/anko ) | `92,579ms` | `18ms` | Interpreter on Go |
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_* [fib(35) ](https://github.com/d5/tengobench/blob/master/code/fib.tengo ): Fibonacci(35)_
_* [fibt(35) ](https://github.com/d5/tengobench/blob/master/code/fibtc.tengo ): [tail-call ](https://en.wikipedia.org/wiki/Tail_call ) version of Fibonacci(35)_
_* **Go** does not read the source code from file, while all other cases do_
_* See [here ](https://github.com/d5/tengobench ) for commands/codes used_
## References
- [Language Syntax ](https://github.com/d5/tengo/blob/master/docs/tutorial.md )
- [Object Types ](https://github.com/d5/tengo/blob/master/docs/objects.md )
- [Runtime Types ](https://github.com/d5/tengo/blob/master/docs/runtime-types.md ) and [Operators ](https://github.com/d5/tengo/blob/master/docs/operators.md )
- [Builtin Functions ](https://github.com/d5/tengo/blob/master/docs/builtins.md )
- [Interoperability ](https://github.com/d5/tengo/blob/master/docs/interoperability.md )
- [Tengo CLI ](https://github.com/d5/tengo/blob/master/docs/tengo-cli.md )
- [Standard Library ](https://github.com/d5/tengo/blob/master/docs/stdlib.md )
