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ES6でisNaN関数を作るととてもアレになる。 ref: http://qiita.com/ygkn/items/83cd41c9ee7f0c487b52
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isNaN("x") // -> true | |
Number.isNaN("x") // -> false |
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myIsNaN =_=>_!==_ ; | |
myIsNaN(NaN) // -> true |
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myIsNaN = _ => _ !== _ ; |
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myIsNaN = value => value !== value ; |
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function myIsNaN(value){ | |
return (value !== value); | |
} |
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myIsNaN =_=>({}).toString.call(_)!=="[object Number]"||_!==_ |
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myIsNaN =_=>!(({}).toString.call(_)==="[object Number]"&&_===_) |
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