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djD-REK/checkSelfEqualityToCheckForNaN.js

Created September 15, 2019 15:45
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checkSelfEqualityToCheckForNaN.js
let variable = NaN; // or let variable = Number.NaN
// Check for NaN by checking for self-equality
console.log(variable != variable); // true
console.log(variable !== variable); // true
// NaN is the only value that is not equal to itself
let isNaN = (maybeNaN) => maybeNaN!=maybeNaN;
console.log(isNaN(variable)); // true
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