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charCodeAtとfromCharCodeを試してみよう

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はじめに

String.prototype.charCodeAtとString.fromCharCodeを試してみました。

String.prototype.charCodeAtはUnicodeを10進数に変換するStringのメソッドです。

String.fromCharCodeはUnicodeの値の数のシーケンスを文字列に変換するStringの静的メソッドです。

How

Node.jsでもブラウザでも確認できます。

% node
> "ABC".charCodeAt(0)
65
> "ABC".charCodeAt(1)
66
> "ABC".charCodeAt(2)
67
> "未来".charCodeAt(0)
26410
> "未来".charCodeAt(1)
26469
> "未来".charCodeAt(2)
NaN
> "未来".charCodeAt(-1)
NaN
> String.fromCharCode(65,66,67)
'ABC'
> String.fromCharCode(26410)
''
> String.fromCharCode(26411)
''
> String.fromCharCode(26412)
''
> String.fromCharCode(26413)
''
> String.fromCharCode(26414)
''
> String.fromCharCode(26415)
''
> String.fromCharCode(26416)
''
> String.fromCharCode(26417)
''
> String.fromCharCode(26418)
''
> String.fromCharCode(26419)
''
> String.fromCharCode(26420)
''

参照URL

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