如何改进switch语句或替换它？

Question

我有开关，它看起来很长：

switch (+f.level) {
  case 10:
    this.region = f
    break

  case 20:
    this.aregion = f
    break

  case 30:
    this.district = f
    break

  case 40:
    this.city = f
    break

  case 50:
    this.intraCityTerritoryn = f
    break
}

我试图修改它：

public directory = {
  {10: this.region}, 
  {20: this.aregion}, 
  {30: this.district}, 
  {40: this.city}
};

然后我尝试通过 key 获取 varaible 并分配f。

Answer 1

您可以使用具有f.level（数字值）和预期对象属性的键值对的查找对象

const lookup = {
  10: "region",
  20: "aregion",
  30: "district",
  40: "city",
  50: "intraCityTerritoryn",
}

this[lookup[+f.level]] = f

对于default等价情况（因为this[undefined] = f仍然是有效的赋值表达式）

if (lookup[+f.level] !== undefined) {
  this[lookup[+f.level]] = f
} else {
  // ...
}

参考：

• 对象属性访问器

  object.property
  object['property']