从对象的平面数组构建对象的树数组 [英] Building tree array of objects from flat array of objects
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问题描述
我想从平面数组构建树形数组:
I want to build a tree array from flat array:
这是平面数组:
nodes = [
{id: 1, pid: 0, name: "kpittu"},
{id: 2, pid: 0, name: "news"},
{id: 3, pid: 0, name: "menu"},
{id: 4, pid: 3, name: "node"},
{id: 5, pid: 4, name: "subnode"},
{id: 6, pid: 1, name: "cace"}
];
NB:id =节点id; pid =父节点ID.
NB: id = node id; pid = parent node id.
我想将其转换为该数组:
I want to transform it into this array:
nodes = [{
id: 1,
name: 'kpittu',
childs: [{
id: 6,
name: 'cace'
}]
}, {
id: 2,
name: 'news'
}, {
id: 3,
name: 'menu',
childs: [{
id: 4,
name: 'node',
childs: [{
id: 5,
name: 'subnode'
}]
}]
}];
我试图使用递归函数来达到预期的结果,但是我正在寻找一种更好的方法.感谢您的回复.
I tried to use a recursive function to achieve the expected result, but I'm looking for a better approach. Thanks for your response.
推荐答案
您可以使用哈希表,并在每个循环中将id
和pid
用作连接的节点.
You could use a hash table and take id
and pid
in every loop as connected nodes.
此建议也适用于未排序的数据.
This proposal works with unsorted data as well.
var nodes = [{ id: 6, pid: 1, name: "cace" }, { id: 1, pid: 0, name: "kpittu" }, { id: 2, pid: 0, name: "news" }, { id: 3, pid: 0, name: "menu" }, { id: 4, pid: 3, name: "node" }, { id: 5, pid: 4, name: "subnode" }],
tree = function (data, root) {
var r = [], o = {};
data.forEach(function (a) {
if (o[a.id] && o[a.id].children) {
a.children = o[a.id] && o[a.id].children;
}
o[a.id] = a;
if (a.pid === root) {
r.push(a);
} else {
o[a.pid] = o[a.pid] || {};
o[a.pid].children = o[a.pid].children || [];
o[a.pid].children.push(a);
}
});
return r;
}(nodes, 0);
console.log(tree);
.as-console-wrapper { max-height: 100% !important; top: 0; }
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