February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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325
レシピ 9.4 モジュール API を拡張する
_buildStats
には、
if
文で
cb
の存在判定を追加しました。本スクリプトの
_buildStats
はコー
ルバックかイベントリスナのどちらを使うかを選択できるようになるため、
cb
が存在しない場合
があるからです。
次に、開発者が
Mp3dat
インスタンスを動的に生成する場合、インスタンス生成時に
spawn
イベ
ントを発生させて、インスタンス生成時にフックできるようにします。
lib/index.js
Mp3dat.prototype.spawnInstance = function() {
var m = Mp3dat();
this.emit('spawn', m);
return m;
}
最後に、
stat
メソッドからチェーンで別のメソッドをつなげられるようにします。
stat
メソッ
ド内でファイル名入力の場合とストリーム入力の場合のそれぞれでメソッドを終了するときに（
2
か所）、
Mp3dat
オブジェクト（
self
）を返すように変更します。
lib/index.js
Mp3dat.prototype.stat = function(f, cb) {
//
中略
if (isOptsObj) {
//
中略
self._compile(null, opts, cb);
return self; //
}
//
中略
self._compile.call(self, err, fstats, cb);
});
return self; // ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.