https://github.com/mberlanda/learn_some_erlang_for_great_good
Misc learning resources from https://learnyousomeerlang.com/ et al.
https://github.com/mberlanda/learn_some_erlang_for_great_good
Last synced: 3 months ago
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Misc learning resources from https://learnyousomeerlang.com/ et al.
- Host: GitHub
- URL: https://github.com/mberlanda/learn_some_erlang_for_great_good
- Owner: mberlanda
- Created: 2025-01-06T11:19:30.000Z (5 months ago)
- Default Branch: main
- Last Pushed: 2025-01-12T17:53:52.000Z (5 months ago)
- Last Synced: 2025-01-14T23:54:13.706Z (5 months ago)
- Language: Erlang
- Size: 13.7 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Learn Some Erlang For Great Good!
This repository collects my first steps in Erlang world.
References to materials will be added to this README over the time:
* **Learn you Some Erlang For Great Good** book online: https://learnyousomeerlang.com/
* **asdf version manager**: https://asdf-vm.com/guide/getting-started.html
* ohmyzsh plugin configuration: https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/asdf
* asdf plugins: https://github.com/asdf-vm/asdf-erlang
```
asdf plugin add erlang https://github.com/asdf-vm/asdf-erlang.git
export KERL_CONFIGURE_OPTIONS="--disable-debug --without-javac"
asdf install erlang 27.2
```
Installation failed with error
```
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/unistd.h:639:10: fatal error: cannot open file '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/select.h': Too many open files
```
```
➜ ~ ulimit -a
-t: cpu time (seconds) unlimited
-f: file size (blocks) unlimited
-d: data seg size (kbytes) unlimited
-s: stack size (kbytes) 8176
-c: core file size (blocks) 0
-v: address space (kbytes) unlimited
-l: locked-in-memory size (kbytes) unlimited
-u: processes 1333
-n: file descriptors 256
```
Increasing file descriptors limit fixed the installation issues: `ulimit -S -n 1024`
```
asdf list all erlang
asdf global erlang 27.2
```
* **vs code plugin**: https://marketplace.visualstudio.com/items?itemName=pgourlain.erlang
### Data Types
```
➜ learn_some_erlang_for_great_good git:(main) ✗ mkdir ebin
➜ learn_some_erlang_for_great_good git:(main) ✗ erlc -o ebin src/data_types.erl
➜ learn_some_erlang_for_great_good git:(main) ✗ erlc -o ebin test/data_types_test.erl
➜ learn_some_erlang_for_great_good git:(main) ✗ erl -pa ebin
Erlang/OTP 27 [erts-15.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]
Eshell V15.2 (press Ctrl+G to abort, type help(). for help)
1> eunit:test(data_types_test).
All 8 tests passed.
ok
```
These commands have been moved to Makefile and being executed by github actions.
### Modules
Compile
```
➜ learn_some_erlang_for_great_good git:(main) ✗ erl
Erlang/OTP 27 [erts-15.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit]
Eshell V15.2 (press Ctrl+G to abort, type help(). for help)
1> cd("./src").
.../learn_some_erlang_for_great_good/src
ok
2> c(useless).
{ok,useless}
3> useless:add(5,3).
8
4> useless:hello().
Hello, world!
ok
5> useless:greet_and_add_two(4).
Hello, world!
6
```
Add compiler debug_info
```
6> compile:file(useless, [debug_info, export_all]).
{ok,useless}
7> c(useless, [debug_info, export_all]).
{ok,useless}
```
Module info
```
13> c(useless).
{ok,useless}
14> useless:module_info(attributes).
[{vsn,[196039944454595751978011564439718590907]},
{author,"An Erlang Champ"}]
```
### Syntax in Functions
* https://www.erlang.org/doc/system/typespec.html
* https://learnyousomeerlang.com/syntax-in-functions
### Types
```
is_atom/1 is_binary/1
is_bitstring/1 is_boolean/1 is_builtin/3
is_float/1 is_function/1 is_function/2
is_integer/1 is_list/1 is_number/1
is_pid/1 is_port/1 is_record/2
is_record/3 is_reference/1 is_tuple/1
```