const a = document.createElement("a");
a.id = "test1";
a.href = "test2";
document.body.appendChild(a);
console.log(window.test1);
Ответ:
JavaScript test | #JavaScript
Please open Telegram to view this post
VIEW IN TELEGRAM
function Person(name) {
this.name = name;
this.sayName = () => console.log(this.name);
}
const person1 = new Person('David');
const person2 = { name: 'Not David', sayName: person1.sayName };
person2.sayName();
Ответ:
Please open Telegram to view this post
VIEW IN TELEGRAM
const target = { name: 'Sarah', age: 25 };
const handler = {
get(obj, prop) {
if (prop in obj) {
return obj[prop];
}
return `Property '${prop}' not found`;
},
set(obj, prop, value) {
obj[prop] = value.toString().toUpperCase();
return true;
}
};
const proxy = new Proxy(target, handler);
proxy.city = 'boston';
console.log(proxy.name);
console.log(proxy.city);
console.log(proxy.country);
Ответ:
JavaScript test | #JavaScript
Please open Telegram to view this post
VIEW IN TELEGRAM
function Person(name) {
this.name = name;
this.sayName = () => console.log(this.name);
}
const person1 = new Person('David');
const person2 = { name: 'Not David', sayName: person1.sayName };
person2.sayName();
Ответ:
Please open Telegram to view this post
VIEW IN TELEGRAM
❗️Что будет на выходе:
Ответ:1 2 3 false
JavaScript test | #JavaScript
const sym1 = Symbol('test');
const sym2 = Symbol('test');
const obj = {
[sym1]: 'first',
[sym2]: 'second',
regular: 'third'
};
const keys = Object.keys(obj);
const symbols = Object.getOwnPropertySymbols(obj);
const allProps = Reflect.ownKeys(obj);
console.log(keys.length);
console.log(symbols.length);
console.log(allProps.length);
console.log(sym1 === sym2);
Ответ: