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NaN - Wikipedia NaNには quiet NaN と signaling NaN の2種類がある。 quiet NaN は不正な操作や不正な値で生じる誤りを伝播させるのに使用され、signaling NaN は数値計算と 記号計算 （英語版） の混合や基本的な浮動小数点演算への他の拡張といった高度な機能のサポートに使える。
NaN - JavaScript | MDN - MDN Web Docs To tell if a value is NaN, use Number isNaN() or isNaN() to most clearly determine whether a value is NaN — or, since NaN is the only value that compares unequal to itself, you can perform a self-comparison like x !== x
Home | National Academy of Neuropsychology "I joined NAN to stay abreast of research and industry news, and the organization has been an invaluable resource over my professional career I utilize NAN resources in my leadership role and I enjoy having a community of professionals that I trust as a 'go to' for mentorship and guidance
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