elixir에서 튜플 접근

elixir tuple indexing

```
a = {1,2,3, 6}
a[1] # 이러면 에러남.

elem(a, 0) # 이함수로 접근 해야 함.
```

[1] [https://inquisitivedeveloper.com/lwm-elixir-13/#:~:text=Elixir%20tuples%20are%20stored%20contiguously,pair%20of%20curly%20braces%20%7B%7D%20.&text=The%20elem%2F2%20function%20is,data%20item%20in%20a%20tuple.&text=The%20length%20of%20a%20tuple,with%20the%20tuple_size%2F1%20function.](https://inquisitivedeveloper.com/lwm-elixir-13/#:~:text=Elixir%20tuples%20are%20stored%20contiguously,pair%20of%20curly%20braces%20%7B%7D%20.&text=The%20elem%2F2%20function%20is,data%20item%20in%20a%20tuple.&text=The%20length%20of%20a%20tuple,with%20the%20tuple_size%2F1%20function.)