🔗 JavaScript Object Properties

🔗 Description

To think like a JavaScript hacker, we need to practice making unusual objects. Engine developers have historically made mistakes when it comes to the intricacies of object interactions.

🔗 Exercise

Using what we have learned about objects and properties, construct an object which will cause the quiz function to call the win function.

JavaScript
function quiz(obj) {
  for (let name of Object.keys(obj)) {
    delete obj[name];
  }
  if (obj.win) {
    win('You win!');
  } else {
    console.log('You lose...');
  }
}

quiz(... your object here ...)

JavaScript
let obj = {};
Object.defineProperty(obj, 'win', {value:true, configurable:false})
quiz(obj); // You win!

JavaScript
let obj = {};
obj.__proto__ = {win:1};
quiz(obj); // You win!

JavaScript
let obj = {win: 1};
let objp = new Proxy(obj, {
    deleteProperty: function(obj, prop) {
        return false;
    }
});
quiz(objp);

• Docs for Object.keys
• Docs for delete