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create code fences with backticks ` or tildes ~
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like so
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add language identifier to highlight code
```python
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print(foo)
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lang-js
const mergeUnique = (a, b) => a.concat(b.filter(v => a.indexOf(v) === -1))findIndexfor finding index of objects by their property values within thefilter()function like so:const index = arr1.findIndex(i => i.id === item.id);