如何将菊花链/点符号中的JavaScript对象展开为具有嵌套对象和数组的对象? [英] How to unflatten a JavaScript object in a daisy-chain/dot notation into an object with nested objects and arrays?
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问题描述
我想要取消这样的对象......
I want to unflatten an object like this...
var obj2 = {
"firstName": "John",
"lastName": "Green",
"car.make": "Honda",
"car.model": "Civic",
"car.revisions.0.miles": 10150,
"car.revisions.0.code": "REV01",
"car.revisions.0.changes": "",
"car.revisions.1.miles": 20021,
"car.revisions.1.code": "REV02",
"car.revisions.1.changes.0.type": "asthetic",
"car.revisions.1.changes.0.desc": "Left tire cap",
"car.revisions.1.changes.1.type": "mechanic",
"car.revisions.1.changes.1.desc": "Engine pressure regulator",
"visits.0.date": "2015-01-01",
"visits.0.dealer": "DEAL-001",
"visits.1.date": "2015-03-01",
"visits.1.dealer": "DEAL-002"
};
...进入具有嵌套对象和数组的对象,如下所示:
... into an object with nested objects and arrays like the following:
{
firstName: 'John',
lastName: 'Green',
car: {
make: 'Honda',
model: 'Civic',
revisions: [
{ miles: 10150, code: 'REV01', changes: ''},
{ miles: 20021, code: 'REV02', changes: [
{ type: 'asthetic', desc: 'Left tire cap' },
{ type: 'mechanic', desc: 'Engine pressure regulator' }
] }
]
},
visits: [
{ date: '2015-01-01', dealer: 'DEAL-001' },
{ date: '2015-03-01', dealer: 'DEAL-002' }
]
}
这是我的(失败)尝试:
Here's my (failed) attempt:
function unflatten(obj) {
var result = {};
for (var property in obj) {
if (property.indexOf('.') > -1) {
var substrings = property.split('.');
console.log(substrings[0], substrings[1]);
} else {
result[property] = obj[property];
}
}
return result;
};
为了对对象和数组进行嵌套,我很快就开始不必要地重复代码。这绝对是需要递归的东西。有什么想法吗?
I quickly started repeating code unnecessarily in order to do the nesting of objects and arrays. This is definitely something that needs recursion. Any ideas?
编辑:我也在另一个问题。
推荐答案
您可以先在循环中使用循环来循环对象属性,然后在
处拆分每个键。
然后使用reduce来构建嵌套属性。
You can first use for...in
loop to loop object properties, then split each key at .
then use reduce to build nested properties.
var obj2 = {"firstName":"John","lastName":"Green","car.make":"Honda","car.model":"Civic","car.revisions.0.miles":10150,"car.revisions.0.code":"REV01","car.revisions.0.changes":"","car.revisions.1.miles":20021,"car.revisions.1.code":"REV02","car.revisions.1.changes.0.type":"asthetic","car.revisions.1.changes.0.desc":"Left tire cap","car.revisions.1.changes.1.type":"mechanic","car.revisions.1.changes.1.desc":"Engine pressure regulator","visits.0.date":"2015-01-01","visits.0.dealer":"DEAL-001","visits.1.date":"2015-03-01","visits.1.dealer":"DEAL-002"}
function unflatten(data) {
var result = {}
for (var i in data) {
var keys = i.split('.')
keys.reduce(function(r, e, j) {
return r[e] || (r[e] = isNaN(Number(keys[j + 1])) ? (keys.length - 1 == j ? data[i] : {}) : [])
}, result)
}
return result
}
console.log(unflatten(obj2))
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