Elegant writing JS code

1. Airbnb
2. Elegance ES5
3. Elegance React
4. Elegance css-in-javascript

Array

// 复制
var len = items.length;
var itemsCopy = [];
var i;

// bad
for (i = 0; i < len; i++) {
  itemsCopy[i] = items[i];
}

// good
itemsCopy = items.slice();
// good
itemsCopy = [...items]

// 类数组对象转数组
const arrLike = { 0: 'foo', 1: 'bar', 2: 'baz', length: 3 };

// bad
const arr = Array.prototype.slice.call(arrLike);

// good
const arr = Array.from(arrLike);

String

// 单引号
// bad
var name = "Bob Parr";

// good
var name = 'Bob Parr';