Example Calculator struct for the Neovim plugin blog post

calculator.rs

struct Calculator;

impl Calculator {
  fn new() -> Calculator {
    Calculator {}
  }
  
  // Add a vector of numbers.
  fn add(&self, nums: Vec<i64>) -> i64 {
    nums.iter().sum::<i64>()
  }
  
  // Multiply two numbers
  fn multiply(&self, p: i64, q: i64) -> i64 {
     p * q
  }
}