如何使用JS中的递归在嵌套数组中查找对象 [英] How to find a object in a nested array using recursion in JS
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问题描述
考虑以下深层嵌套数组:
Consider the following deeply nested array:
const array = [
{
id: 1,
name: "bla",
children: [
{
id: 23,
name: "bla",
children: [{ id: 88, name: "bla" }, { id: 99, name: "bla" }]
},
{ id: 43, name: "bla" },
{
id: 45,
name: "bla",
children: [{ id: 43, name: "bla" }, { id: 46, name: "bla" }]
}
]
},
{
id: 12,
name: "bla",
children: [
{
id: 232,
name: "bla",
children: [{ id: 848, name: "bla" }, { id: 959, name: "bla" }]
},
{ id: 433, name: "bla" },
{
id: 445,
name: "bla",
children: [
{ id: 443, name: "bla" },
{
id: 456,
name: "bla",
children: [
{
id: 97,
name: "bla"
},
{
id: 56,
name: "bla"
}
]
}
]
}
]
},
{
id: 15,
name: "bla",
children: [
{
id: 263,
name: "bla",
children: [{ id: 868, name: "bla" }, { id: 979, name: "bla" }]
},
{ id: 483, name: "bla" },
{
id: 445,
name: "bla",
children: [{ id: 423, name: "bla" }, { id: 436, name: "bla" }]
}
]
}
];
我如何通过使用递归可能深度嵌套的键来获取某个对象?
我试过这个,但这不适用于嵌套深度超过2级,它只返回 undefined
:
How would I grab a certain object by key that might be deeply nested, using recursion?
I have tried this, but this won't work for nesting deeper than 2 levels, it then just returns undefined
:
const findItemNested = (arr, itemId, nestingKey) => {
for (const i of arr) {
console.log(i.id);
if (i.id === itemId) {
return i;
}
if (i[nestingKey]) {
findItemNested(i[nestingKey], itemId, nestingKey);
}
}
};
结果应为:
const res = findItemNested(array,959,children); >> {id:959,名称:bla}
这也许可以使用 .find
,或者只是为了展平数组(通过子键),但使用递归对我来说似乎是最合理的解决方案。有人有解决方案吗?
This can perhaps also be achieved using .find
, or just to flatten the array (by the children key), but using recursion seems like the most logical solution to me. Does anybody have a solution to this?
提前致谢:)。
推荐答案
您可以使用递归 reduce
:
const array=[{id:1,name:"bla",children:[{id:23,name:"bla",children:[{id:88,name:"bla"},{id:99,name:"bla"}]},{id:43,name:"bla"},{id:45,name:"bla",children:[{id:43,name:"bla"},{id:46,name:"bla"}]}]},{id:12,name:"bla",children:[{id:232,name:"bla",children:[{id:848,name:"bla"},{id:959,name:"bla"}]},{id:433,name:"bla"},{id:445,name:"bla",children:[{id:443,name:"bla"},{id:456,name:"bla",children:[{id:97,name:"bla"},{id:56,name:"bla"}]}]}]},{id:15,name:"bla",children:[{id:263,name:"bla",children:[{id:868,name:"bla"},{id:979,name:"bla"}]},{id:483,name:"bla"},{id:445,name:"bla",children:[{id:423,name:"bla"},{id:436,name:"bla"}]}]}];
const findItemNested = (arr, itemId, nestingKey) => (
arr.reduce((a, item) => {
if (a) return a;
if (item.id === itemId) return item;
if (item[nestingKey]) return findItemNested(item[nestingKey], itemId, nestingKey)
}, null)
);
const res = findItemNested(array, 959, "children");
console.log(res);
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