January 2014
Intermediate to advanced
352 pages
6h 34m
Japanese
Content preview from JavaScriptで学ぶ関数型プログラミング
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149
5.4 部分適用
var createCommand = partial(validateCommand, _.identity);
JavaScript
のコードに安全性をもたらすのは、規律の徹底と、慎重な考え方です。
createCommand
関数の場合は、次の例のように、コマンドオブジェクトの生成と検証
に利用する共通のゲートウェイ関数を提供する意図があります。
createCommand({});
// Error:
マップデータである必要があります
createCommand(21);
// Error:
マップデータである必要があります
,
設定オブジェクトは正しいキーを持っている
必要があります
createCommand({msg: "", type: ""});
//=> {msg: "", type: ""}
関数合成を使うことによって、後に実行ロジックや検証プロセスをカスタマイズす
るために、追加の合成を行うことができます。もし設定オブジェクトに他のキーの存
在が必要な派生コマンドタイプを組み立てたい場合は、次のように追加合成すること
によって実現できます。
var createLaunchCommand = partial1(
condition1(
validator("
設定オブジェクトには
countDown
プロパティが必要です
",
hasKeys('countDown'))),
createCommand);
そして
createLaunchCommand
関数は以下のように動作します。 ...
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