如何在对象/数组内链接？

Question

I want to link users with their parents/children/spouses in same .js file

So, how do I 'link' within an object. Let say:

const users = {
  bradpitt: {
    name: "Brad",
    lastname: "Pitt",
    spouses: [{
      angelinajolie
    }]
  },
  angelinajolie: {
    name: "Angelina",
    lastname: "Jolie",
    parents: [{
      jonvoight
    }]
  }
  jonvoight: {
    name: "Jon"
  }
}

So I can use it like this:

getParents() {
  for (const u of users) {
    return u.parents.name
  }
}

Result: Jon

Answer 1

You are on the right way, but missing some key features:

Take a look at the comments within this snippet!

The main problem is the fact that you assign the object angelinajolie to bradpitt before the object angelinejolie is defined. An easier and more secure way to do this is with id's because names are not unique. I've used this in my example:

Also with properties you use a for...in loop and you need to check if the property is available. If u.parents is undefined it will throw an error.

I've changed the unique names to id numbers build with the string id and six digits. id00000 . In the users object I simply refer to the user without the leading zeros and id. To rebuild this in the getParents function I've used String.prototype.padStart . It pads zeros to the left of the string until 6 characters are reached.

"id"+(p.toString().padStart(6, '0'));

 const users = { id000001 : { name: "Brad", lastname: "Pitt", spouses: [ 1 ] }, id000002 : { name: "Angelina", lastname: "Jolie", parents: [ 3 ] }, //fixed a missing comma here id000003: { name: "Jon" } } function getParents() { //define a return object //return parents per set of users const parents = {}; //iterate over every user for (key in users) { const u = users[key]; //if the user has parents go on if (u.parents) { //save the parents to parent object with the user as key: //use map to iterate over every parent and return the name of the parent parents[key] = u.parents.map((p) => users["id"+(p.toString().padStart(6, '0'))].name); } }; //return the parents object return parents; } //log to console to show results: console.log(getParents());