freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/understand-string-immutability/index.md

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title: Understand String Immutability
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# Understand String Immutability


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## Hints

### Hint 1
Instead of  ```Jello World ```, ```myStr``` should be assigned ```Hello World```.


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
// Setup
var myStr = "Jello World";
// Only change code below this line
myStr = "Hello World";
```
#### Code Explanation
String literals such as ```"Jello World"``` cannot be changed by the individual letter (hence being *immutable*), so the variable containing the incorrect string must be replaced with the desired string using the assignment operator ```=```
</details>