javascript - 将变量操作数应用于运算符

Question

我有一个表格:

data:[
   { operator: '*', operand1: 45, operand2: 80 },
   { operator: '*', operand1: 14, operand2: 47 },
   { operator: '+', operand1: 80, operand2: 6  }
];

我需要解析 JSON 数据并返回一组答案。我对如何将变量运算符“应用”到操作数感到困惑。谢谢!

Answer 1

将运算符映射到调用时执行运算符的函数，例如:

const operatorFns = {
  '*': (a, b) => a * b,
  '+': (a, b) => a + b
  // etc
};

const data = [
   { operator: '*', operand1: 45, operand2: 80 },
   { operator: '*', operand1: 14, operand2: 47 },
   { operator: '+', operand1: 80, operand2: 6  }
];

const results = data.map(item => operatorFns[item.operator](item.operand1, item.operand2));
console.log(results);