Deno

A new way to JavaScript

	Linux & Mac	Windows
deno
deno_std
deno_install
registry

#Install

With Shell

curl -fL https://deno.land/x/install/install.sh | sh

With PowerShell

iex (iwr https://deno.land/x/install/install.ps1)

#Mini-tutorial

Try a Deno program. This one serves a local directory in HTTP.

alias file_server="deno \
  https://deno.land/x/http/file_server.ts --allow-net"
      

Run it:

% file_server .
Downloading https://deno.land/x/http/file_server.ts...
[...]
HTTP server listening on http://0.0.0.0:4500/
      

And if you ever want to upgrade to the latest published version:

file_server --reload

#Dig in...

API Reference

Links to other Deno resources.

#Continuous Benchmarks

These plots are updated on every commit to

master branch

#Execution time

This shows how much time total it takes to run a few simple deno programs:

and

tests/003_relative_import.ts

For deno to execute typescript, it must first compile it to JS. A warm startup is when deno has a cached JS output already, so it should be fast because it bypasses the TS compiler. A cold startup is when deno must compile from scratch.

#Throughput

Time it takes to pipe a certain amount of data through Deno.

and

Smaller is better.

#Req/Sec

Tests HTTP server performance. 10 keep-alive connections do as many hello-world requests as possible. Bigger is better.

• deno is a fake http server that doesn't parse HTTP. It is comparable to node_tcp .
• deno_net_http is a web server written in TypeScript. It is comparable to node_http .
• hyper is a Rust HTTP server and represents an upper bound.

#Executable size

deno ships only a single binary. We track its size here.

#Thread count

How many threads various programs use.

#Syscall count

How many total syscalls are performed when executing a given script.

Historical benchmark data