diff options
author | Louis Pilfold <louis@lpil.uk> | 2024-02-20 12:20:16 +0000 |
---|---|---|
committer | Louis Pilfold <louis@lpil.uk> | 2024-02-20 12:20:16 +0000 |
commit | 938f49fc7835501192ccc7db7c1ab3174f050b34 (patch) | |
tree | 3e515fa15b6812df9947df80b8c16afd20faa436 /src/content/chapter5_advanced_features/lesson05_multi_target_externals | |
parent | e7d45ec089262e8b6731ddf87e65a06f4de07841 (diff) | |
download | tour-938f49fc7835501192ccc7db7c1ab3174f050b34.tar.gz tour-938f49fc7835501192ccc7db7c1ab3174f050b34.zip |
Let assert
Diffstat (limited to 'src/content/chapter5_advanced_features/lesson05_multi_target_externals')
-rw-r--r-- | src/content/chapter5_advanced_features/lesson05_multi_target_externals/code.gleam | 11 | ||||
-rw-r--r-- | src/content/chapter5_advanced_features/lesson05_multi_target_externals/en.html | 22 |
2 files changed, 0 insertions, 33 deletions
diff --git a/src/content/chapter5_advanced_features/lesson05_multi_target_externals/code.gleam b/src/content/chapter5_advanced_features/lesson05_multi_target_externals/code.gleam deleted file mode 100644 index b62a735..0000000 --- a/src/content/chapter5_advanced_features/lesson05_multi_target_externals/code.gleam +++ /dev/null @@ -1,11 +0,0 @@ -import gleam/io - -pub type DateTime - -@external(erlang, "calendar", "local_time") -@external(javascript, "./my_package_ffi.mjs", "now") -pub fn now() -> DateTime - -pub fn main() { - io.debug(now()) -} diff --git a/src/content/chapter5_advanced_features/lesson05_multi_target_externals/en.html b/src/content/chapter5_advanced_features/lesson05_multi_target_externals/en.html deleted file mode 100644 index 6e02d36..0000000 --- a/src/content/chapter5_advanced_features/lesson05_multi_target_externals/en.html +++ /dev/null @@ -1,22 +0,0 @@ -<p> - Multiple external implementations can be specified for the same function, - enabling the function to work on both Erlang and JavaScript. -</p> -<p> - If a function doesn't have an implementation for the currently compiled-for - target then the compiler will return an error. -</p> -<p> - You should try to implement functions for all targets, but this isn't always - possible due to incompatibilities in how IO and concurreny works in Erlang and - JavaScript. With Erlang concurrent IO is handled transparently by the runtime, - while in JavaScript concurrent IO requires the use of promises or callbacks. - If your code uses the Erlang style it is typically not possible to implement - in JavaScript, while if callbacks are used then it won't be compatible with - most Gleam and Erlang code as it forces any code that calls the function to - also use callbacks. -</p> -<p> - Libraries that make use of concurrent IO will typically have to decide whether - they support Erlang or JavaScript, and document this in their README. -</p> |