Question

我有一个对象

const currentData: CreateProjectData = {
  title: '',
  description: '',
  projectType: '',
  projectStart: undefined,
  projectTime: 0,
};

有没有一种方法可以检查对象中的所有值是否都是伪造的（例如0，undefined，''等），而无需将对象转换为数组然后循环遍历？

Answer 1

用于for ... in循环迭代对象并检查真实值

const currentData = {
  title: '',
  description: '',
  projectType: '',
  projectStart: undefined,
  projectTime: 0,
};

var checkFalsyObject = (data) => {
  for (var prop in data) {
    if (data[prop]) return false;
  }
  return true;
}

console.log(checkFalsyObject(currentData));

但是更简单的方法是使用Object.values获取所有值，然后使用Array.prototype.every检查所传递的回调是否满足所有元素的要求。

const currentData = {
  title: '',
  description: '',
  projectType: '',
  projectStart: undefined,
  projectTime: 0,
};

const areAllFalsy = Object.values(currentData).every(el=>!el);

console.log(areAllFalsy)

Answer 2

如果您不想为此创建额外的数组：

function isDubiousData(data) {
  for (let p in data)
    if (data[p]) return false;
  return true;
}

const currentData = {
  title: '',
  description: '',
  projectType: '',
  projectStart: undefined,
  projectTime: 0,
  budget: null,
  onTime: false,
  bankAccountBalance: 0n,
  teamCoherency: NaN,
  qualityIndex: -0
};

console.log(isDubiousData(currentData));

currentData.title = "0";
console.log(isDubiousData(currentData));

Answer 3

由于您需要检查所有对象值，因此除非您要对每个可能的属性进行硬编码，否则任何解决方案都将涉及某种循环。如果要在不构造任何数组的情况下执行此操作，则唯一的方法是使用for..in：

let allFalsey = true;

const currentData = {
  title: '',
  description: '',
  projectType: '',
  projectStart: undefined,
  projectTime: 0,
};

for (const prop in currentData) {
  if (currentData[prop]) {
    allFalsey = false;
    break;
  }
}
console.log(allFalsey);

但是使用数组确实要容易得多，使用for..in确实很愚蠢：

const currentData = {
  title: '',
  description: '',
  projectType: '',
  projectStart: undefined,
  projectTime: 0,
};

const allFalsey = !Object.values(currentData).some(Boolean);
console.log(allFalsey);

Answer 4

检查一下

const CreateProjectData = {
  title: '',
  description: null,
  projectType: 1,
  projectStart: undefined,
  projectTime: 0,
};

for(var key in CreateProjectData){
  if(!CreateProjectData[key])
    console.log(`${key} is false`);
  else
    console.log(`${key} is true`);
}

检查所有对象键值是否都是虚假的

4 个答案: