https://github.com/wingkwong/deno-playground
My Deno Playground
https://github.com/wingkwong/deno-playground
deno playground
Last synced: 10 days ago
JSON representation
My Deno Playground
- Host: GitHub
- URL: https://github.com/wingkwong/deno-playground
- Owner: wingkwong
- License: mit
- Created: 2020-05-19T02:57:50.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-05-19T03:43:17.000Z (over 5 years ago)
- Last Synced: 2025-02-16T03:43:21.528Z (8 months ago)
- Topics: deno, playground
- Language: TypeScript
- Size: 5.86 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# deno-playground
My Deno Playground
## Install Deno
```
brew install deno
```
Deno Help
```
deno 1.0.0
A secure JavaScript and TypeScript runtime
Docs: https://deno.land/std/manual.md
Modules: https://deno.land/std/ https://deno.land/x/
Bugs: https://github.com/denoland/deno/issues
To start the REPL:
deno
To execute a script:
deno run https://deno.land/std/examples/welcome.ts
To evaluate code in the shell:
deno eval "console.log(30933 + 404)"
USAGE:
deno [OPTIONS] [SUBCOMMAND]
OPTIONS:
-h, --help Prints help information
-L, --log-level Set log level [possible values: debug, info]
-q, --quiet Suppress diagnostic output
-V, --version Prints version information
SUBCOMMANDS:
bundle Bundle module and dependencies into single file
cache Cache the dependencies
completions Generate shell completions
doc Show documentation for a module
eval Eval script
fmt Format source files
help Prints this message or the help of the given subcommand(s)
info Show info about cache or info related to source file
install Install script as an executable
repl Read Eval Print Loop
run Run a program given a filename or url to the module
test Run tests
types Print runtime TypeScript declarations
upgrade Upgrade deno executable to given version
ENVIRONMENT VARIABLES:
DENO_DIR Set deno's base directory (defaults to $HOME/.deno)
DENO_INSTALL_ROOT Set deno install's output directory
(defaults to $HOME/.deno/bin)
NO_COLOR Set to disable color
HTTP_PROXY Proxy address for HTTP requests
(module downloads, fetch)
HTTPS_PROXY Same but for HTTPS
```
You can run both TypeScript (.ts) files, or JavaScript (.js) files.
```
➜ ~ deno run https://deno.land/std/examples/welcome.ts
Download https://deno.land/std/examples/welcome.ts
Warning Implicitly using master branch https://deno.land/std/examples/welcome.ts
Compile https://deno.land/std/examples/welcome.ts
Welcome to Deno 🦕
```
## Deno Code Examples
Check out via https://deno.land/std/examples/.
- cat.ts prints the content a list of files provided as arguments
- catj.ts prints the content a list of files provided as arguments
- chat/ an implementation of a chat
- colors.ts an example of
- curl.ts a simple implementation of curl that prints the content of the URL specified as argument
- echo_server.ts a TCP echo server
- gist.ts a program to post files to gist.github.com
- test.ts a sample test suite
- welcome.ts a simple console.log statement (the first program we ran above)
- xeval.ts allows you to run any TypeScript code for any line of standard input received. Once known as deno xeval but since removed from the official command.
## Hello World
```
import { serve } from 'https://deno.land/std/http/server.ts'
const s = serve({ port: 8000 })
console.log('http://localhost:8000/')
for await (const req of s) {
req.respond({ body: 'Hello World\n' })
}
```
Run it using ``deno run app.ts``. Deno downloads all the required dependencies.
```
Compile file:///Users/wingkwong/Documents/GitHub/deno-playground/hello-world/app.ts
Download https://deno.land/std/http/server.ts
Warning Implicitly using master branch https://deno.land/std/http/server.ts
Download https://deno.land/std/encoding/utf8.ts
Download https://deno.land/std/io/bufio.ts
Download https://deno.land/std/testing/asserts.ts
Download https://deno.land/std/async/mod.ts
Download https://deno.land/std/http/_io.ts
Warning Implicitly using master branch https://deno.land/std/encoding/utf8.ts
Warning Implicitly using master branch https://deno.land/std/http/_io.ts
Warning Implicitly using master branch https://deno.land/std/async/mod.ts
Warning Implicitly using master branch https://deno.land/std/io/bufio.ts
Warning Implicitly using master branch https://deno.land/std/testing/asserts.ts
Download https://deno.land/std/io/util.ts
Warning Implicitly using master branch https://deno.land/std/io/util.ts
Download https://deno.land/std/path/mod.ts
Warning Implicitly using master branch https://deno.land/std/path/mod.ts
Download https://deno.land/std/path/win32.ts
Download https://deno.land/std/path/posix.ts
Download https://deno.land/std/path/common.ts
Download https://deno.land/std/path/separator.ts
Download https://deno.land/std/path/interface.ts
Download https://deno.land/std/path/glob.ts
Warning Implicitly using master branch https://deno.land/std/path/win32.ts
Warning Implicitly using master branch https://deno.land/std/path/posix.ts
Warning Implicitly using master branch https://deno.land/std/path/common.ts
Warning Implicitly using master branch https://deno.land/std/path/separator.ts
Warning Implicitly using master branch https://deno.land/std/path/interface.ts
Warning Implicitly using master branch https://deno.land/std/path/glob.ts
Download https://deno.land/std/path/_constants.ts
Download https://deno.land/std/path/_util.ts
Warning Implicitly using master branch https://deno.land/std/path/_constants.ts
Warning Implicitly using master branch https://deno.land/std/path/_util.ts
Download https://deno.land/std/fmt/colors.ts
Download https://deno.land/std/testing/diff.ts
Warning Implicitly using master branch https://deno.land/std/fmt/colors.ts
Warning Implicitly using master branch https://deno.land/std/testing/diff.ts
Download https://deno.land/std/path/_globrex.ts
Warning Implicitly using master branch https://deno.land/std/path/_globrex.ts
Download https://deno.land/std/async/deferred.ts
Download https://deno.land/std/async/delay.ts
Download https://deno.land/std/async/mux_async_iterator.ts
Warning Implicitly using master branch https://deno.land/std/async/deferred.ts
Warning Implicitly using master branch https://deno.land/std/async/mux_async_iterator.ts
Warning Implicitly using master branch https://deno.land/std/async/delay.ts
Download https://deno.land/std/textproto/mod.ts
Download https://deno.land/std/http/http_status.ts
Warning Implicitly using master branch https://deno.land/std/textproto/mod.ts
Warning Implicitly using master branch https://deno.land/std/http/http_status.ts
Download https://deno.land/std/bytes/mod.ts
Warning Implicitly using master branch https://deno.land/std/bytes/mod.ts
error: Uncaught PermissionDenied: network access to "0.0.0.0:8000", run again with the --allow-net flag
at unwrapResponse ($deno$/ops/dispatch_json.ts:43:11)
at Object.sendSync ($deno$/ops/dispatch_json.ts:72:10)
at Object.listen ($deno$/ops/net.ts:51:10)
at listen ($deno$/net.ts:152:22)
at serve (https://deno.land/std/http/server.ts:261:20)
at file:///Users/wingkwong/Documents/GitHub/deno-playground/hello-world/app.ts:2:11
```
Hitting a permission denied problem is expected. It won't allow you to run in the browser on your system unless you explicitly allow it. To do that, we need to add an extra flag ``--allow-net``.
```
deno run --allow-net app.ts
```
Other flags allow Deno to unlock other functionality:
- ``--allow-env`` allow environment access
- ``--allow-hrtime`` allow high resolution time measurement
- ``--allow-net=`` allow network access
- ``--allow-plugin`` allow loading plugins
- ``--allow-read=`` allow file system read access
- ``--allow-run`` allow running subprocesses
- ``--allow-write=`` allow file system write access
- ``--allow-all`` allow all permissions (same as ``-A``)
## Formatting Code
Deno provides ``deno fmt`` like Go to format your code.
## For More
- [Deno Official Website](https://deno.land)
- [API Documentation](https://deno.land/typedoc/index.html)
- [Awesome Deno](https://github.com/denolib/awesome-deno)