Function applyOperator

src/math.test.ts:19–30

(a: number, b: number, operator: Operator)

  }

  function applyOperator(a: number, b: number, operator: Operator): number {
    switch (operator) {
      case '+':
        return a + b;
      case '-':
        return a - b;
      case '*':
        return a * b;
      case '/':
        return a / b;
    }
  }

  function* MathExpression(): ParseGenerator {
    yield whitespaceMay;