javascript - 使用包含数字段的路径设置嵌套值时如何创建数组

Question

我正在努力弄清楚如何修改此 setValue() 函数，以便在遇到数字路径段时创建一个数组(如果它不存在)。当路径段是数字时，我尝试分配 [] 而不是 {} 但它没有按预期工作。

var obj = {};

setValue(obj, "Application.0.Employment.0.Id", 1); 

//Not working because objects are not created as arrays   
obj.Application[0].Employment.push({ Id: 2 });


function setValue(object, path, value) {

   var a = path.split('.');
   var o = object;
   for (var i = 0; i < a.length - 1; i++) {
          var n = a[i];
          if (n in o) {
              o = o[n];
           } else {
              //o[n] = isNaN(n) ? {} : [];
                o[n] = {};
                o = o[n];
           }
   }
   o[a[a.length - 1]] = value;

}

Answer 1

你需要向前看一个索引。您在评论中的尝试应更改为:

o[n] = isNaN(a[i+1]) ? {} : [];

function setValue(object, path, value) {
    var a = path.split('.');
    var o = object;
    for (var i = 0; i < a.length - 1; i++) {
        var n = a[i];
        if (n in o) {
            o = o[n];
        } else {
            o[n] = isNaN(a[i+1]) ? {} : [];
            o = o[n];
        }
    }
    o[a[a.length - 1]] = value;
}

var obj = {};
setValue(obj, "Application.0.Employment.0.Id", 1); 
console.log(JSON.stringify(obj));

obj.Application[0].Employment.push({ Id: 2 });
console.log(JSON.stringify(obj));