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<!DOCTYPE html>
<html>
<head>
<title>ES6とは</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
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class: center, middle
# ES6とは
2018/02/06
Kobayashi Kazuhiro (kzhrk)
---
## 本日のテーマ
- 課題チェック
- ESって？
- ESのサポートブラウザの話
- なぜES2015(ES6)なのか
- 実案件でどう使っているのか
---
class: center, middle
# 課題チェック
---
## 前回の課題
CommonChunkPluginでjquery + slickを使う
webpack.config.jsにCommonChunkPluginを設定して、slickを実行する
https://github.com/kzhrk-sandbox/training-webpack/tree/master/step4
https://kzhrk-sandbox.github.io/training-webpack/step4/public/
---
class: center, middle
# ES6とは何か
---
class: center, middle
# そもそもESとは
---
class: center, middle
# ECMAScript
---
class: center, middle
# 🤔🤔🤔
---
## ECMAとは
European Computer Manufacturers Association
欧州電子計算機工業会（現在はEcma International）
ECMAとは国際的な標準化団体の名称。HTMLでいうところのW3C。
---
## ECMAScriptとは
標準化団体のECMA Internationalが定義するJavaScriptの言語仕様。
---
## URLs
- [ECMAScriptの公式サイト](https://tc39.github.io/ecma262/)
- [GitHubリポジトリ](https://github.com/tc39/ecma262)
- [TC39のGitHubアカウント](https://github.com/tc39)
ECMA-262(規格番号) = ECMAScript
TC39 = Ecma International内でECMAScriptの策定を行っているグループ
---
## ES6の6とは
6th editionのこと。つまりversion。
6th editionから「ECMAScript 2015」仕様の名称に発行年が付加されるようになっている。
http://www.wirfs-brock.com/allen/posts/778
> why the year-based designation? The 6th edition of ECMA-262 took a long time to develop, arguably 15 years.<br>
[...]<br>
After a few years we would be talking about ES6, ES7, ES8, ES9, ES10, ES11, etc. Those numbers quickly loose any context for people who aren’t deeply involved in the standards development process.<br>
[...]<br>
We decide that TC39 would incorporate the year of release into the documents title and to encourage people to use the year when referring to a specific edition.
---
class: center, middle
# 🆖ES6 => 🆗ES2015
---
class: center, middle
# ES2015のサポートブラウザ
---
## 参考URL
- [Can I use](https://caniuse.com/#search=es6)
- [ECMAScript 6 compatibility table](http://kangax.github.io/compat-table/es6/)
- [Google Chrome Platform Status](https://www.chromestatus.com/features#ES6)
- [ECMAScript 6 support in Mozilla](https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_2015_support_in_Mozilla)
- [Microsoft platform status](https://developer.microsoft.com/en-us/microsoft-edge/platform/status/arrayprototypeincludeses2016/?search=es6&q=category%3Ajavascript)
- [WebKit Feature Status](https://webkit.org/status/#specification-ES6)
---
class: center, middle
# なぜES2015なのか
---
## 開発が楽になる
- コード量が減る
- よりプログラマブルにコードを書ける
- バグが減る
---
class: center, middle
# 実案件でどう使っているのか
---
## Babel.js
https://babeljs.io/
ターゲットブラウザを指定して、未対応のES2015~の記述をES5の記述に変更してくれるJavaScriptコンパイラ。
---
## Babel with webpack
.babelrc
```:js
{
"presets": ["es2015"]
}
```
webpack.config.js
```:js
[...]
module: {
rules: [
{
test: /\.js$/,
use: [{
loader: "babel-loader"
}]
}
]
},
[...]
```
---
## ES2015 features
- Arrorws
- Classes
- Enhanced Object Literals
- Template Strings
- Arguments: Default
- Arguments: Rest
- Arguments: Spread
- let, const
- Modules
- Promises
---
## Arrorws
- 関数の定義が短縮される
- thisの束縛がおきない
```:js
function sample(){
var _this = this;
_this.count = 0;
setInterval(function(){
console.log(_this.count++);
}, 1000);
}
sample();
```
```:js
function sample(){
this.count = 0;
setInterval(()=>{
console.log(this.count++);
}, 1000);
}
sample();
```
---
## Classes
```:js
class Cat {
constructor() {
this.name = 'cat';
this.voice = 'nyaa';
}
}
class MyCat extends Cat {
constructor() {
super();
this.name = 'tama';
}
}
const myCat = new MyCat();
console.log(myCat.name);
console.log(myCat.voice);
```
---
## Enhanced Object Literals
- Objectのkeyの省略
- keyの変数化
```:js
var hoge = 1;
var obj = {
hoge,
fuga() {
return 'fuga';
},
['piyo' + hoge]: 'piyo1'
};
console.log(obj);
console.log(obj.fuga());
```
---
## Template Strings
- 文字列内に変数を含めることができる
```:js
var year = 2018;
var month = 1;
var day = 6;
// es5
console.log(year + '-' + (month+1) + '-' + day);
// es2015
console.log(`${year}-${month + 1}-${day}`);
```
---
## Arguments: Default
- 関数の引数にデフォルト値の設定
```:js
function add(x, y = 1) {
console.log(x+y);
}
add(1);
```
---
## Arguments: Rest
- 関数の未定義の引数を配列として受け取る
```:js
function add(x, ...arr) {
console.log(x, arr);
}
add(1,2,3);
```
---
## Arguments: Spread
- 関数の引数として配列を受け渡す
```:js
function add(x, y, z) {
console.log(x + y + z);
}
add(...[1, 2, 3]);
add(1,...[2, 3]);
add(1, 2,...[3]);
```
---
## let, const
- let: ブロックスコープ
- const: シングルアサイン
```:js
const x = 1;
x = 2; // error
```
```:js
let x = 0;
(function() {
let x = 1;
let x = 2; // error
})();
```
---
## Modules
- モジュール定義
```:js
// math.js
export const sum = (x, y)=>{
return (x+y);
}
export const pi = '3.14';
```
```:js
// app.js
import * as math from './math';
console.log(
math.sum(1,2),
math.pi
);
```
---
## Modules
### export
```:js
export { name1, name2 };
export { variable1 as name1, variable2 as name2 };
export let name1 = 1;
export default expression;
export default function (…) { … }
export default function name1(…) { … }
export * from name1;
```
---
## Modules
### import
```:js
import defaultMember from "module-name";
import * as name from "module-name";
import { member } from "module-name";
import { member as alias } from "module-name";
import { member1, member2 } from "module-name";
import { member1, member2 as alias2 } from "module-name";
import defaultMember, { member } from "module-name";
import defaultMember, * as name from "module-name";
import "module-name";
```
---
## Promises
- 非同期処理を行う
```:js
function timeout(duration = 0, name) {
return new Promise((resolve, reject) => {
setTimeout(()=>{
console.log(`タイマー名:${name}`, `セットされた時間:${duration}`);
resolve();
}, duration);
});
}
timeout(1000, '最初').then(() => {
return timeout(2000, '2番目');
}).then(() => {
throw new Error("hmm");
}).catch(err => {
return Promise.all([timeout(2000, '3番目'), timeout(1000, '4番目')]);
});
```
---
## 他にもいろいろ
https://github.com/lukehoban/es6features
- generator
- unicode
- proxie
- map, weakmap
- symbols
- etc...
---
class: center, middle
# END
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