Object

JavaScript: Basic Object Variable
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Object size

var size = Object.keys(myObj).length;

Assign the object variable key from another variable

Assisn key-value after object init

const key = "someKey";
const value = "someValue";
const obj = {};

// set the object key using the variable
obj[key] = value;

console.log(obj); // { someKey: "someValue" }

Assisn key-value when object init

The key of the object is set using the computed property names syntax ([key]). This allows you to use the value of the key variable as the key of the object.

const key = "someKey";
const value = "someValue";

const obj = {
  [key]: value
};

console.log(obj); // { someKey: "someValue" }

Import javascript object key and assign it to the new variable

let person = {
  name: 'KJ',
  age: 17,
  jobTitle: 'No Job',
};

// KJ, 17
const { name, age } = person;

Import javascript object key and rename it to the different variable name

let person = {
  name: 'KJ',
  age: 17,
  jobTitle: 'No Job',
};

// KJ, 17
const { 
    name: kj_name, 
    age: kj_age 
} = person;

Reference