[英]Create a nested array recursively in Node.js
以下是我的數組
[
{id: 1, title: 'hello', parent: {number:0}},
{id: 2, title: 'hello', parent: {number:0}},
{id: 3, title: 'hello', parent: {number:1}},
{id: 4, title: 'hello', parent: {number:3}},
{id: 5, title: 'hello', parent: {number:4}},
{id: 6, title: 'hello', parent: {number:4}},
{id: 7, title: 'hello', parent: {number:3}},
{id: 8, title: 'hello', parent: {number:2}}
]
我希望將這樣嵌套的對象作為輸出:
[
{id: 1, title: 'hello', parent: 0, children: [
{id: 3, title: 'hello', parent: 1, children: [
{id: 4, title: 'hello', parent: 3, children: [
{id: 5, title: 'hello', parent: 4},
{id: 6, title: 'hello', parent: 4}
]},
{id: 7, title: 'hello', parent: 3}
]}
]},
{id: 2, title: 'hello', parent: 0, children: [
{id: 8, title: 'hello', parent: 2}
]}
]
請幫助我使用遞歸函數在 node.js 中執行此操作。
以下是我嘗試過的遞歸函數:
function getNestedChildren(arr, parent) {
var out = []
for(var i in arr) {
if(arr[i].parent.number == parent.number) {
var children = getNestedChildren(arr, arr[i].id)
if(children.length) {
arr[i].children = children
}
out.push(arr[i])
}
}
return out
}
請幫我解決這個問題。 我是這方面的新手。
重命名一些變量幫助我解決了這個問題。
getNestedChildren
返回兒童的數組,所以重命名out
以children
。grandchildren
。導致代碼不工作的問題:
id
屬性。 因此,要么確保對getNestedChidren
每次調用getNestedChidren
提供具有此類屬性的對象(如下所示),要么將第二個參數更改為parentNumber
並僅提供number
屬性的數值。 你的選擇。 最后,避免for ... in
循環中使用for ... in
來迭代數組 - 請進行網絡搜索以獲取更多信息和討論。
var array = [ {id: 1, title: 'hello', parent: {number:0}}, {id: 2, title: 'hello', parent: {number:0}}, {id: 3, title: 'hello', parent: {number:1}}, {id: 4, title: 'hello', parent: {number:3}}, {id: 5, title: 'hello', parent: {number:4}}, {id: 6, title: 'hello', parent: {number:4}}, {id: 7, title: 'hello', parent: {number:3}}, {id: 8, title: 'hello', parent: {number:2}} ] function getNestedChildren(arr, parent) { var children = []; for(var i =0; i < arr.length; ++i) { if(arr[i].parent.number == parent.number) { var grandChildren = getNestedChildren(arr, {number: arr[i].id}) if(grandChildren.length) { arr[i].children = grandChildren; } children.push( arr[i]); } } return children; } var nest = getNestedChildren(array,{number: 0}); console.log( nest);
如果有人想知道帶有扁平初始數組的解決方案,請按照 user992731 的請求:
var array = [ {id: 1, title: 'hello', parent: 0}, {id: 2, title: 'hello', parent: 0}, {id: 3, title: 'hello', parent: 1}, {id: 4, title: 'hello', parent: 3}, {id: 5, title: 'hello', parent: 4}, {id: 6, title: 'hello', parent: 4} ]; function getNestedChildren(arr, parent) { var children = []; for(var i =0; i < arr.length; ++i) { if(arr[i].parent == parent) { var grandChildren = getNestedChildren(arr, arr[i].id); if(grandChildren.length) { arr[i].children = grandChildren; } children.push(arr[i]); } } return children; } var nest = getNestedChildren(array,0); console.log(nest);
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