feat: added info about typeof null (#26899)

* feat: added info about typeof null * Further clarify change
2019-02-25 05:43:49 +01:00 · 2019-02-25 05:43:49 +01:00 · 0f905531df
parent ef625c80c6
commit 0f905531df
1 changed files with 6 additions and 2 deletions
--- a/guide/english/javascript/typeof/index.md
+++ b/guide/english/javascript/typeof/index.md
@ -83,11 +83,15 @@ Even thought this is a useful validation method, we have to be careful because j
 ```javascript
 var x = [1,2,3,4]; 
 console.log(typeof x)  // object
-
 console.log(typeof null)  // object
-
 ```

+The last example above is a well-known JavaScript 'mistake' and a fix was proposed in ECMAScript, which would have resulted in: 
+```javascript
+typeof null === 'null' // true
+```
+But due to major legacy issues it had to be rejected.
+

 ### More Information:
 <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof' target='_blank' rel='nofollow'>MDN Documentation for typeof</a>