How to create self-executing anonymous function in Object?

Question

in my object

let obj = {
  name:["Harry","Scren","Docis","Altab"],
  age:[32,44,22,55]
}

I need to write down a self executing anonymous function in object that, when i call any member of the object it will execute that self executing anonymous function and it will check whether the length of both array (name and age) are equal or not, If not equal then throw an error .....I need to have something like

let obj = {
  name:["Harry","Scren","Docis","Altab"],
  age:[32,44,22,55],

  (function(){
    if(name.length != age.length){
      throw new Error('both name and age 's length are not equal')
     }
    }()) // But this is not possible to create in object I have just showed down what I wanted to create
}

How to create something like that in javascript object ??

Answer 1

I'm not sure, but I think that's not possible... But let me ask a question: why you have an obj containing two arrays? Hasn't more sense having an array of the obj which each element of the array contains one name and one age? I'll show you

const people = [
    { name: "Pearson 1", age: 20 },
    { name: "Pearson 2", age: 20 },
    { name: "Pearson 3", age: 20 },
    { name: "Pearson 4", age: 20 },
]

So you do not have to check the length since every obj has its own name and age field.