This macro defines a function so we can use the ~> operator to easily set values in a nested structure (map, struct, list) in Elixir.
It makes use of Elixir's put_in/2 function, which I personally dislike using directly because it is ugly and it obfuscates the parameters being passed in. Let's use a new operator to make it clear we're doing magic, and also make things pretty.
Make sure to import the macro
import UpdateOperator
If we have a map, such as
mymap = %{foo: %{bar: %{baz: "original value"}}}
We can now update the map using
mymap = "new value" ~> mymap.foo.bar.baz
This is free and unencumbered software released
into the public domain.
Anyone is free to copy, modify, publish, use, compile,
sell, or distribute this software, either in source
code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the
author or authors of this software dedicate any and
all copyright interest in the software to the public
domain. We make this dedication for the benefit of
the public at large and to the detriment of our heirs
and successors. We intend this dedication to be an overt
act of relinquishment in perpetuity of all present and
future rights to this software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
OR OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org/>