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If you want to check NaN equal to NaN:

isNaN(+NaN) === isNaN(+NaN)

For eg.:

const a = 'asdf234'
const b = 123
const c = '234asf'
console.log(isNaN(+a) === isNaN(+b)) // false
console.log(isNaN(+a) === isNaN(+c)) // true