mirror of
https://github.com/jbranchaud/til
synced 2026-01-03 15:18:01 +00:00
26 lines
742 B
Markdown
26 lines
742 B
Markdown
# Pattern Matching In Anonymous Functions
|
|
|
|
Pattern matching shows up everywhere in Elixir, even where you may not be
|
|
expecting it. When declaring an anonymous function, you can use pattern
|
|
matching against different sets and shapes of input parameters to invoke
|
|
different behaviors.
|
|
|
|
Here is an example of how you might use this:
|
|
|
|
```elixir
|
|
> handle_result = fn
|
|
{:ok, result} -> IO.puts "The result is #{result}"
|
|
:error -> IO.puts "Error: couldn't find anything"
|
|
end
|
|
#Function<6.50752066/1 in :erl_eval.expr/5>
|
|
|
|
> Map.fetch(%{a: 1}, :a) |> handle_result.()
|
|
The result is 1
|
|
:ok
|
|
> Map.fetch(%{a: 1}, :b) |> handle_result.()
|
|
Error: couldn't find anything
|
|
:ok
|
|
```
|
|
|
|
[source](https://elixirschool.com/lessons/basics/functions#pattern-matching)
|