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console.log(isNaN("hoge")); // true
console.log(isNaN({"a": "hoge"})); // true
console.log(isNaN(function a() { return })); // true
console.log(isNaN(5)); // false
console.log(isNaN("12345")); // false
console.log(isNaN(parseInt("12345"))); // false
console.log(isNaN(null)); // false
console.log(isNaN(false)); // false
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