Enum Pattern Matching

thing.js

export function Thing { 
  constructor(one, two) {
    this.one = one;
    this.two = two;
  }
}

let t1 = new Thing(1, 2);
let t2 = new Thing('one', 'two');
let t3 = addThings(t1, t2); // {one: '1 & one', two: '2 & two'}

function addThings(lhs, rhs) {
  let one, two;
  if (lhs.one && typeof lhs.one === 'number' && rhs.one && typeof rhs.one ==v 'number') {
    one = lhs.one + rhs.one;
  } else {
    one = `${lhs.one} & ${rhs.one}`
  }
  if (lhs.two && typeof lhs.two === 'number' && rhs.two && typeof rhs.two === 'number') {
    two = lhs.two + rhs.two;
  } else {
    two = `${lhs.two} & ${rhs.two}`;
  }
  return new Thing(one, two);
}

thing.rs

struct Thing {
  pub one: NumberOrString,
  pub two: NumberOrString,
}

enum {
  Number(f32),
  String(String),
}

fn add_things(lhs: &Thing, rhs: &Thing) -> Thing {
  let one = match (&lhs.one, &rhs.one) {
    (NumberOrString::String(s1), NumberOrString::String(s2)) => NumberOrString::String(format!("{} & {}", s1, s2)),
    (NumberOrString::String(s1), NumberOrString::Number(f2)) => NumberOrString::String(format!("{} & {}", s1, f2)),
    (NumberOrString::Nmber(f1), NumberOrString::Number(s2)) => NumberOrString::String(format!("{} & {}", f1, s2)),
    (NumberOrString::Number(f1), NumberOrString::Number(f2)) => NumberOrString::Number(f1 + f2),
  };
  let two = match (&lhs.two, &rhs.two) {
    (NumberOrString::String(s1), NumberOrString::String(s2)) => NumberOrString::String(format!("{} & {}", s1, s2)),
    (NumberOrString::String(s1), NumberOrString::Number(f2)) => NumberOrString::String(format!("{} & {}", s1, f2)),
    (NumberOrString::Nmber(f1), NumberOrString::Number(s2)) => NumberOrString::String(format!("{} & {}", f1, s2)),
    (NumberOrString::Number(f1), NumberOrString::Number(f2)) => NumberOrString::Number(f1 + f2),
  };
  Thing { 
    one, 
    two, 
  }
}

fn main() {
  let t1 = Thing {
    one: NumberOrString::Number(1),
    two: NumberOrString::Number(2),
  };
  let t2 = Thing {
    one: NumberOrString::String("one".to_string()),
    two: NumberOrString::String("two".to_string()),
  };
  let t3 = add_things(t1, t2);
}