假设我有当前数据对象:
const human = {
name: '',
age: 0,
head: {
rightEye: '',
leftEye: '',
}
limbs: {
arms: '',
legs: '',
}
somethingElse: '',
}
我想删除每个空键/值对。而这部分我可以使用以下代码进行操作:
const removeFalsy = (obj) => {
const newObj = {};
Object.keys(obj).forEach((prop) => {
if (obj[prop]) {
if (typeof obj[prop] === 'object') {
newObj[prop] = removeFalsy(obj[prop]);
} else {
newObj[prop] = obj[prop];
}
}
});
return newObj;
};
事情是空的对象仍然停留在主对象中。我想从主对象中删除所有空对象,以获得以下结果:
const human = {};
代替我当前的结果:
const human = {
head: {},
limbs: {},
}
我最好的选择是什么?
答案 0 :(得分:2)
在递归调用removeFalsy
时,仅当递归调用的结果具有一个至少带有一个键的对象时,才分配给newObj
:
const removeFalsy = (obj) => {
const newObj = {};
Object.keys(obj).forEach((prop) => {
if (obj[prop]) {
if (typeof obj[prop] === 'object') {
// change below:
const nonFalseyVal = removeFalsy(obj[prop]);
if (Object.keys(nonFalseyVal).length !== 0) {
newObj[prop] = nonFalseyVal;
}
// change above
} else {
newObj[prop] = obj[prop];
}
}
});
return newObj;
};
const human = {
name: '',
age: 0,
head: {
rightEye: '',
leftEye: '',
},
limbs: {
arms: '',
legs: '',
},
somethingElse: '',
}
const nonFalsyHuman = removeFalsy(human);
console.log(nonFalsyHuman);
请注意,使用.reduce
可能更合适,您可以使用Object.entries
立即获取键和:
const removeFalsy = (obj) => {
return Object.entries(obj).reduce((a, [key, val]) => {
if (!val) return a;
if (typeof val === 'object') {
const nonFalseyVal = removeFalsy(val);
if (Object.keys(nonFalseyVal).length !== 0) {
a[key] = nonFalseyVal;
}
} else {
a[key] = obj[key];
}
return a;
}, {});
};
const human = {
name: '',
age: 0,
head: {
rightEye: '',
leftEye: '',
},
limbs: {
arms: '',
legs: '',
},
somethingElse: '',
}
const nonFalsyHuman = removeFalsy(human);
console.log(nonFalsyHuman);
答案 1 :(得分:2)
您需要进行以下更改
if (typeof obj[prop] === 'object') {
条件,仅在对象具有一些有效键的情况下设置值。if (obj[prop]) {
条件以允许其他非伪造的值进入循环,例如0等
const human = {name: '',age: 0,head: {rightEye: '',leftEye: ''},limbs: {arms: '',legs: ''},somethingElse: ''};
const removeFalsy = (obj) => {
const newObj = {};
Object.keys(obj).forEach((prop) => {
if (obj[prop] !== "") {
if (typeof obj[prop] === 'object') {
const temp = removeFalsy(obj[prop]);
if(Object.keys(temp).length) newObj[prop] = temp;
} else {
newObj[prop] = obj[prop];
}
}
});
return newObj;
};
console.log(removeFalsy(human));