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Diffstat (limited to 'learn-you-some-erlang/discrep4.erl')
| -rw-r--r-- | learn-you-some-erlang/discrep4.erl | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/learn-you-some-erlang/discrep4.erl b/learn-you-some-erlang/discrep4.erl new file mode 100644 index 0000000..949a843 --- /dev/null +++ b/learn-you-some-erlang/discrep4.erl @@ -0,0 +1,21 @@ +-module(discrep4). +-export([run/0]). +-type cents() :: integer(). +-type account() :: atom(). +-type transaction() :: {'give', cents(), account()}. + +run() -> + Tup = money(5, you), + some_op(item(count,Tup), item(account,Tup)). + +-spec money(cents(), account()) -> transaction(). +money(Num, Name) -> {give, Num, Name}. + +-spec item('count', transaction()) -> cents(); + ('account', transaction()) -> account(). +item(count, {give, X, _}) -> X; +item(account, {give, _, X}) -> X. + +some_op(A,B) -> A + B. + + |