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Javascript 比較仕様 備忘録。

Last updated at Posted at 2023-01-20

両者が文字列の場合は、Unicode値による比較。

文字列 文字列  =>  Unicode値 Unnicode値

両者が文字列でない場合は、非数値型を数値に変換し比較。

< 変換仕様 >

true -> 1

false -> 0

null -> 0

"数値" -> 数値  ( "5" -> 5 )

"数値でない文字列" -> NaN  ( "p5" -> NaN )

undefined -> NaN

いずれかの値が NaN の場合、演算子は false を返す。

片方がBigInt型の場合も比較可能。

"5" < 7n  =>  true
 5n < 3   =>  false
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