我是一个表的结果,它给了我动态的字段层次结构,我需要用它来创建一个JSON对象。
EX:
[ [ 'request', 'cycleRange' ],
[ 'request', 'cycleRange', 'from' ],
[ 'request', 'cycleRange', 'to' ],
[ 'request', 'cycleRange', 'to', 'month' ],
[ 'request', 'cycleRange', 'to', 'year' ],
[ 'request', 'datestmt' ],
[ 'request', 'singleTran' ],
[ 'request', 'singleTran', 'datePost' ],
[ 'request', 'singleTran', 'dateTo' ] ]
我期望使用此示例创建的JSON对象应该是:
let expected = {
request: {
cycleRange: {
from: null,
to: {
month: null,
year: null
}
},
datestmt: null,
singleTran: {
datePost: null,
dateTo: null
}
}
};
我正在使用此函数来尝试构建对象,但我只是将最终数组作为对象:
let final = {};
for (let i of heirarchy) {
assign(final, i, null);
}
function assign(obj, keyPath, value) {
let lastKeyIndex = keyPath.length - 1;
let key;
let i;
for (i=0; i<lastKeyIndex; i++) {
key = keyPath[i];
if (!(key in obj)) {
obj[key] = {};
} else {
if (i !== lastKeyIndex) {
obj[key] = {};
}
}
obj = obj[key];
}
obj[keyPath[lastKeyIndex]] = value;
}
目前我的结果我只得到:(我的源层次结构的最后一个索引)
{"request":{"singleTran":{"dateTo":null}}}
任何帮助,将不胜感激。
因为obj
引用final
,这条线可能会让你恶作剧:
obj = obj[key];
这将在hte循环的每次迭代中覆盖obj
(在本例中为final
)。我建议跟踪一个单独的变量,以便final
保持不变异
我有这个解决方案,但我认为有很多简化和改进的空间,我也用{}替换了null。
您可以使用lodash:https://lodash.com/docs/4.17.11#set中的_.set来替换我的示例中的set。
const array = [ [ 'request', 'cycleRange' ],
[ 'request', 'cycleRange', 'from' ],
[ 'request', 'cycleRange', 'to' ],
[ 'request', 'cycleRange', 'to', 'month' ],
[ 'request', 'cycleRange', 'to', 'year' ],
[ 'request', 'datestmt' ],
[ 'request', 'singleTran' ],
[ 'request', 'singleTran', 'datePost' ],
[ 'request', 'singleTran', 'dateTo' ] ];
const set = (path, obj) => path.split('.').reduce((o,i)=> {
return o[i] ? o[i] : o[i] = {};
}, obj)
let myNewObject = {};
let path = '';
array.forEach(element => {
path = '';
element.forEach(key => {
path = path ? path + '.' + key : key;
set(path, myNewObject);
});
});
console.log(myNewObject);
我使用package deepmerge将各个结果合并到我的最终对象中
const deepmerge = require('deepmerge');
let final = {};
for (let i of heirarchy) {
let temp = {};
assign(temp, i, null);
final = deepmerge(final, temp);
}