什么是“$”运算符？

Question

我在 Daml 文档中看到了一些示例，其中使用了运算符“$”，但无法完全理解其用途。

示例：

submit alice $ create User with username = alice, following = []

是否与do相同，如：

submit alice do
  create User with username = alice, following = []

?

Answer 1

$ 运算符可替代括号。范例

submit alice $ create User with username = alice, following = []

与

相同

submit alice (create User with username = alice, following = [])

---

完成，do用于声明一个代码块（多行代码）：

test = scenario do
  alice <- getParty "Alice"
  bob <- getParty "Bob"
  ...

不过也可以单行代码使用：

submit alice do create User with username = alice, following = []