В этой небольшой статье мы разберем девять приемов, с помощью которых Ваш JavaScript-код станет короче.

Итак, приступим.

1. Объявляние переменных

//Longhand
let x;
let y;
let z = "post";
//Shorthand
let x, y, z = "post";

2. Операторы присваивания

//Longhand
x = x + y;
x = x - y;
//Shorthand
x += y;
x -= y;

3. Тернарный оператор

let answer, num = 15;
//Longhand
if (num > 10) {
  answer = "greater than 10";
}
else {
  answer = "less than 10";
}
//Shorthand
const answer = num > 10 ? "greater than 10" : "less than 10";

4. Цикл for

const languages = ["html", "css", "js"];
//Longhand
for (let i = 0; i < languages.length; i++) {
  const language = languages[i];
  console.log(language);
}
//Shorthand
for (let language of languages) console.log(language);

5. Шаблонные литералы

const name = "Dev";
const timeOfDay = "afternoon";
//Longhand
const greeting = "Hello " + name + ", I wish you a good " + timeOfDay + "!";
//Shorthand
const greeting = `Hello ${name}, I wish you a good ${timeOfDay}!`;

6. Функции массивов

//Longhand
function sayHello(name) {
  console.log("Hello", name);
}
list.forEach(function (item) {
  console.log(item);
});
//Shorthand
sayHello = name => console.log("Hello", name);
list.forEach(item => console.log(item));

7. Объявление массивов

//Longhand
let arr = new Array();
arr[0] = "html";
arr[1] = "css";
arr[2] = "js";
//Shorthand
let arr = ["html", "css", "js"];

8. Деструктурирование объектов

const post = {
  data: {
    id: 1,
    title: "9 trick to write less Javascript",
    text: "Hello World!",
    author: "Shoaib Sayyed",
  },
};
//Longhand
const id = post.data.id;
const title = post.data.title;
const text = post.data.text;
const author = post.data.author;
//Shorthand
const { id, title, text, author } = post.data;

9. Ключ и значение объекта идентичны

//Longhand
const userDetails = {
  name: name, // 'name' key = 'name' variable
  email: email,
  age: age,
  location: location,
};
//Shorthand
const userDetails = { name, email, age, location };

Спасибо за внимание.

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