Coding question about sorting non-ASCII

README.md

@@ -11640,6 +11640,45 @@ Even though there is a timer of 5 seconds supplied to `setTimeout` callback, it
 
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+#### 84. What is the output of below code?
+
+```javascript
+let arr = ['wöchentlich','Woche', 'wäre', 'Wann'];
+console.log(arr.sort());
+```
+
+- 1: ['wöchentlich','Woche', 'wäre', 'Wann']
+- 2: ['Wann', 'wäre', 'Woche', 'wöchentlich']
+- 3: ['Wann', 'Woche', 'wäre', 'wöchentlich']
+- 4: ['wäre', 'Wann', 'wöchentlich','Woche']
+
+<details><summary><b>Answer</b></summary>
+<p>
+
+##### Answer: 3
+
+Javascript has a native method sort that allows sorting an array of elements in-place. It will treat each element as a string and sort it alphabetically. But if you try to sort an array of strings which has non-ASCII characters, you will receive a strange result. This is because characters with an accent have higher character codes. 
+
+In this case, the sort order of an array is ['Wann', 'Woche', 'wäre', 'wöchentlich'].
+
+If you want to sort an array of string values which has non-ASCII characters in an ascending order,  there are two possible options like **localeCompare** and **Intl.Collator** provided by ECMAScript Internationalization API.
+
+**localeCompare:**
+```javascript
+let arr = ['wöchentlich','Woche', 'wäre', 'Wann'];
+console.log(arr.sort((a, b) => a.localeCompare(b))); //['Wann', 'wäre', 'Woche', 'wöchentlich']
+```
+**Intl.Collator:**
+```javascript
+let arr = ['wöchentlich','Woche', 'wäre', 'Wann'];
+console.log(arr.sort(Intl.Collator().compare)); //['Wann', 'wäre', 'Woche', 'wöchentlich']
+```
+
+</p>
+</details>
+
+**[⬆ Back to Top](#table-of-contents)**
+ 
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