Javascript parse object key value from string keys [duplicate]

Question

I have custom object

var user = {
  name: "John",
  lastname: "Doe",
  details: {
    age: 33,
    gender: "male",
    education: {
      university: "Oxford"
    }
  }
}

Now I need to function which can parse object key from string. E.g function args:

getObjectKeyValue("details.age") // 33
getObjectKeyValue("details.education.university") // Oxford

How can be realised like this function to get object key value from string dots based key?

Why not directly accessing the object (e.g., user.details.age)? — Arik
– Arik, Commented Jun 14, 2020 at 7:57
This objects passed on translation file and translation strings has dynamic params which must be defined on function arguments. E.g translation string Welcome ${username} to our website @Arik — Andreas Hunter
– Andreas Hunter, Commented Jun 14, 2020 at 8:04
You can use "optional chaining" like so: eval("user?." + "details.education.university".replace(/\./g, '?.')) — Arik
– Arik, Commented Jun 14, 2020 at 8:14

Cagri Tacyildiz · Accepted Answer · 2020-06-14 08:10:25Z

5

There will be better solution but you can try this

var user = {
  name: "John",
  lastname: "Doe",
  details: {
    age: 33,
    gender: "male",
    education: {
      university: "Oxford"
    }
  }
}

console.log(getObjectKeyValue("details.age"))
console.log(getObjectKeyValue("details.education.university"))

function getObjectKeyValue(param){
 var params=param.split(".");
 var obj=user
 params.forEach(el=>{
    obj=obj[el]
 })
 return obj;
}

answered Jun 14, 2020 at 8:10

Cagri Tacyildiz

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