[英]How can I extract specific property as an array from nested array object in JavaScript
Basically I wanted to iterate over each object to get all "Id" property value as an array.基本上我想遍历每个对象以获取所有“Id”属性值作为数组。 My object structure is like-
我的对象结构就像-
{
Id:'1',
children:[
{
Id:'2',
children:[{...},{...},...]
},
{
Id:'5',
children:[
{
Id:'6',
children:[{ Id:'7',...},{Id:'8',...}]
},
{
Id:'9',
children:[{...},{...}]
},
{...},
{...},
.
.
.
]
},
{...}
]
}
Output should be like- ['1','2','3',...'9',...]
输出应该像 -
['1','2','3',...'9',...]
I am trying with recursion.我正在尝试递归。
idArr = [];
getIds(arr) {
(arr || []).forEach(obj => {
this.idArr.push(obj.Id);
this.getIds(obj.children)
})
}
Is there any better approach?有没有更好的办法? If anyone can help it would be nice.
如果有人可以提供帮助,那就太好了。
You could return an array with id and a flat array of the children.你可以返回一个带有 id 的数组和一个孩子的平面数组。
function getIds(object) { return [object.Id, ...(object.children || []).flatMap(getIds)]; } var data = { Id:'1', children: [{ Id:'2', children: [] }, { Id:'5', children:[{ Id:'6', children:[{ Id: '7' }, { Id:'8' }] }, { Id:'9', children: [] }] }] }; console.log(getIds(data));
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