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feat(curriculum): added a short explanation on ES6 for isNan lesson (#62592)

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Co-authored-by: Huyen Nguyen <25715018+huyenltnguyen@users.noreply.github.com>
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Clarence Bakosi 2025-10-25 05:08:51 +01:00 committed by GitHub
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curriculum/challenges/english/blocks/lecture-working-with-numbers-and-common-number-methods/672d26809d388621ad1ecd43.md
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@ -43,7 +43,7 @@ console.log(isNaN("blabla")); // true: "blabla" is not a number
As you can see, `isNaN()` first attempts to convert the parameter to a number. If it can't be converted, it returns `true`. This behavior can lead to some surprising results, especially when dealing with strings that can be coerced into numbers.
Due to these potential inconsistencies, ES6 introduced `Number.isNaN()`. This method does not attempt to convert the parameter to a number before testing. It only returns `true` if the value is exactly `NaN`:
Due to these potential inconsistencies, ES6 (the sixth edition of JavaScript, released in 2015) introduced `Number.isNaN()`. This method does not attempt to convert the parameter to a number before testing. It only returns `true` if the value is exactly `NaN`:
```js
console.log(Number.isNaN(NaN)); // true