August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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30
2 章 Python と JavaScript 間の言語学習の橋渡し
_.each(obj, function(value, key){
//
データに何らかの処理を行う…
これはライブラリ依存関係が生じますが、このような反復処理はデータ可視化作業では一般的で
す。
Underscore
には他にも多くの長所があります。
jQuery
と同様、
Underscore
も
JavaScript
標
準ライブラリとしての地位を獲得しています。
2.3.16
条件分岐：
if
、
else
、
elif
、
switch
例
2-3
と例
2-4
のセクション
C
は、
Python
と
JavaScript
の条件分岐の動作を表しています。
JavaScript
では括弧を使うことを除き、文はよく似ています。実質的な唯一の違いは
Python
の
elif
キーワードです。これは
else if
を結合した便利なキーワードです。
要望が多いにもかかわらず、
Python
にはほとんどの高水準言語にある
switch
文がありませ
ん
†
。しかし、
JavaScript
には
switch
文があります。次のように使います。
switch(expression){
case value1:
// expression === value1
の場合に実行する
break; //
オプションの終了式
case value2:
//...
default:
//
他の照合が失敗した場合
2.3.17
ファイル入出力
JavaScript
にはファイル入出力（
I/O
）に相当するものがありません ...
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