JavaScript で 空白 を トリム（trim、削除） する方法は、何種類か考えられると思いますが… 結局、どの書き方が良いのかわかりませんでした。 そこで、この記事では、"処理速度" という観点で、その方法がよさそうか調査してみました。
まぁ、結論から言うと「ブラウザ毎に違った」という結果でした。。 メインとなるユーザー層が良く使うブラウザで最も速いコードを選ぶ必要があるかもしれません。
JavaScript で 空白 を トリム する コード (測定対象)
var trim1 = function (source) {
return source.replace(/^\s+|\s+$/g, "");
};
var trim2 = function (source) {
return source.replace(/(^\s+)|(\s+$)/g, "");
};
var trim3 = function (source) {
return source.replace(/^[\s]+|[\s]+$/g, "");
};
var trim4 = function (source) {
return source.replace(/^\s+/, '').replace/\s+$/, '');
};
処理速度 測定方法
テストデータは、アルファベットをランダムに並べ替え、0～26の文字数をランダムに先頭から選択し、前後に0～5文字の空白を付加して生成させる文字列を1000種類、準備、利用しました。 測定は、前述1000種類の文字列のトリム処理を、1000回実行する時間を測定しました。
測定環境は、手元にあったブラウザが Chrome と IE だけだったので、その2種類で計測しています。。
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処理速度 測定結果
Chrome 40.0.2214.111 m 単位：[msec]| 平均 | 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|---|
| trim1 | 982.8 | 529 | 334 | 1338 | 1337 | 1376 |
| trim2 | 1181.2 | 429 | 1326 | 1401 | 1370 | 1380 |
| trim3 | 1068.0 | 420 | 1378 | 1064 | 1194 | 1284 |
| trim4 | 484.4 | 335 | 1118 | 305 | 318 | 346 |
Internet Explorer 11 単位：[msec]
| 平均 | 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|---|
| trim1 | 1633.0 | 1578 | 1333 | 1961 | 2223 | 1070 |
| trim2 | 1112.4 | 1080 | 1040 | 1091 | 1291 | 1060 |
| trim3 | 755.4 | 585 | 560 | 612 | 1415 | 605 |
| trim4 | 917.4 | 453 | 446 | 450 | 1658 | 1580 |
まとめ と 考察
冒頭にも書きましたが、結局、ブラウザによって結果は異なりました。
ただ…使うなら trim3 か trim4 が良さそうな気がします。
本当は Firefox、Safari あたりも調査したいところですが…
また、時間ができたらということにしておきます ( ^ ^ ;
参考記事
- ににしふぁくとりー - 入力された文字列に含まれる空白文字を削除する
- Enjoy Blog - Javascript で trim するには
- MIURAN Buisiness System - JavaScriptでtrimする
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