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変数 var, let, const #15

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azu opened this issue May 8, 2016 · 10 comments
Closed
4 of 6 tasks

変数 var, let, const #15

azu opened this issue May 8, 2016 · 10 comments
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Type: 基礎文法

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@azu
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azu commented May 8, 2016 •
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基本文法 #14

変数とプロパティは一緒に説明すべきかは微妙そう。
オブジェクトの説明のあとになりそう。

この書籍のユースケースでは prefer-const ではいいと思ってるけど、REPLで確かめて見て！ みたいなケースだとletの方が繰り返し定義できて便利である。

ここではなぜ複数あるのかとその意味の違いについてだけ簡潔にやる
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azu commented May 8, 2016 •
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  • let and const は何の略か?

constはconstant.

  • 由来(書かない気もするけど調べる)

@azu azu mentioned this issue May 8, 2016
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azu commented May 16, 2016

由来とかってやっぱり見つからないなー。ES3とかそれ以前までいかないと見つからなさそう

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azu commented May 16, 2016

歴史 The history about VariableStatement

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azu commented May 24, 2016

var の話の中でhoistingについて説明するのは時期尚早感がある。
そうした場合に、関数 #20 でその話をするのかという感じになる。
でも、 var と let の違いを説明をするにはその違いを知らないと意味ないしやりにくい感じ

@azu azu mentioned this issue May 24, 2016
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azu commented May 24, 2016

https://leanpub.com/understandinges6/read#leanpub-auto-var-declarations-and-hoisting
Understanding ECMAScript 6 はいきなり これの話なのか

This was referenced May 24, 2016
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azu commented May 26, 2016

"データ"と"値"をどこまで区別して書くのかが曖昧。。
#28 (comment)

これはどっかでかき分けをしっかりしたい

@azu azu mentioned this issue May 26, 2016
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azu added a commit that referenced this issue May 27, 2016
@azu
feat: 変数と変数宣言 (#28)
f1143e1 
var、let、const というキーワードを使っての変数宣言と代入について。

    var、let、const
    変数名に利用できる文字種
    prefer const

Refs:  #15
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azu commented Jun 11, 2016

hoistingについて

@azu azu mentioned this issue Jun 20, 2016
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azu commented Jun 26, 2016

http://wirfs-brock.com/allen/talks/viewsource-es2015.pdf

letの良いところの話

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azu commented Jul 14, 2016

JavaScriptにおけるvar/let/constの使い分け

@yumetodo yumetodo mentioned this issue Jul 18, 2017
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@azu azu mentioned this issue Aug 20, 2017
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azu commented Sep 28, 2017

これは閉じてもいいのかな

@azu azu closed this as completed Sep 28, 2017
@azu azu mentioned this issue Feb 7, 2022
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