Question: Can multiplication be done with parentheses?

[antingle]

I am currently working on creating a calculator and have been using this framework for expression parsing, which has been going wonderfully so far. I am wondering if there is a way to implement multiplication with parentheses (for example "4(2)" = 8). If this is not possible with the current state of the framework, is it something worth adding in?

[nicklockwood]

@ingleanthony yes, this is possible. You need to provide a custom implementation for the () operator, like this:

let expression = Expression("4(2)", symbols: [
      .infix("()"): { args in args[0] * args[1] },
])
print(try expression.evaluate()) // prints 8