[英]Recursive javascript function to return array
我有一个对象数组。 这些对象可能具有称为子代的属性,而该子代又将包含对象的数组。 它实际上是一棵对象树。
var my_array_of_objects=[
{
"object_info": "blah blah",
"children": [
{
"object_info": "blah blah",
"children": [
{
"object_info": "blah blah"
}
]
}
]
},
{
"object_info": "blah blah"
},
{
"object_info": "blah blah"
}
]
我正在尝试递归遍历my_array_of_objects以返回一个数组,该数组将删除树结构,并为每个对象提供一个Relationship_id和parent_relationship_id,但是我在递归发生之前设置了Relationship_id时遇到了问题,我看不到为什么...我认为这是一个范围界定问题?
function sort_relationships(objects, return_objects, parent_relationship_id, relationship_id){
$.each( objects, function( field_key, object ){
relationship_id++;
var new_object={};
new_object.relationship_id=relationship_id;
new_object.parent_relationship_id=parent_relationship_id;
new_object.object_info=object.object_info;
// PUSH OBJECT TO THE ARRAY TO BE RETURNED
return_objects.push(new_object);
// IF THE OBJECT HAS CHILDREN THEN RUN THE FUNCTION AGAIN WITH IT'S OBJECTS
if(object.children instanceof Array){
sort_relationships(object.children,return_objects,new_object.relationship_id,relationship_id);
}
});
return return_objects;
}
var my_new_array = sort_relationships(my_array_of_objects,[],0,0);
基于上面的代码,我希望每个新对象都有一个唯一的Relationship_id,但是它将返回以下内容。
[
{
"relationship_id": 1,
"parent_relationship_id": 0,
"object_info": "blah blah"
},
{
"relationship_id": 2,
"parent_relationship_id": 1,
"object_info": "blah blah"
},
{
"relationship_id": 3,
"parent_relationship_id": 2,
"object_info": "blah blah"
},
{
"relationship_id": 2,
"parent_relationship_id": 0,
"object_info": "blah blah"
},
{
"relationship_id": 3,
"parent_relationship_id": 0,
"object_info": "blah blah"
}
]
我希望有以下几点:
[
{
"relationship_id": 1,
"parent_relationship_id": 0,
"object_info": "blah blah"
},
{
"relationship_id": 2,
"parent_relationship_id": 1,
"object_info": "blah blah"
},
{
"relationship_id": 3,
"parent_relationship_id": 2,
"object_info": "blah blah"
},
{
"relationship_id": 4,
"parent_relationship_id": 0,
"object_info": "blah blah"
},
{
"relationship_id": 5,
"parent_relationship_id": 0,
"object_info": "blah blah"
}
]
您正在对每个递归调用本地的变量执行“ relationship_id++
”,并且未在调用方处反映出来。 您要么需要return
更新后的值,要么仅使用一个自由变量:
function sort_relationships(objects) {
var return_objects = [];
var relationship_id = 0;
function recurse(objects, parent_relationship_id) {
$.each(objects, function(field_key, object) {
relationship_id++;
var new_object = {
relationship_id: relationship_id,
parent_relationship_id: parent_relationship_id,
object_info: object.object_info
};
// PUSH OBJECT TO THE ARRAY TO BE RETURNED
return_objects.push(new_object);
// IF THE OBJECT HAS CHILDREN THEN RUN THE FUNCTION AGAIN WITH IT'S OBJECTS
if (Array.isArray(object.children)) {
recurse(object.children, new_object.relationship_id);
}
});
}
recurse(objects, 0);
return return_objects;
}
var my_new_array=sort_relationships(my_array_of_objects);
您可以为此使用reduce
,对于id(出问题的地方),可以将已累积对象的数量添加到父id中:
function flatten(arr, parentId = 0) { if (!arr) return []; return arr.reduce ( function (acc, obj) { var rel = { object_info: obj.object_info, relationship_id: parentId + acc.length + 1, parent_relationship_id: parentId }; return acc.concat([rel], flatten(obj.children, rel.relationship_id)); }, []); } // sample data var my_array_of_objects=[{ "object_info": "blah blah", "children": [{ "object_info": "blah blah", "children": [{ "object_info": "blah blah" } ] } ] }, { "object_info": "blah blah" }, { "object_info": "blah blah" } ]; // convert var result = flatten(my_array_of_objects); // output console.log(result);
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