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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
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lang-js
arrName[3] = 'newName1';will append if the array has only 3 elements. If there is an element in index 3, this will be replaced. If you want to append at end, it is better to usearrName.push('newName1');