Add firstN and lastN

snippets/firstN.md

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+---
+title: First n elements
+tags: array
+expertise: beginner
+author: chalarangelo
+cover: blog_images/digital-nomad-16.jpg
+firstSeen: 2022-07-22T05:00:00-04:00
+---
+
+Gets the first `n` elements of an array.
+
+- Use `Array.prototype.slice()` with a start value of `0` and an end value of `n` to get the first `n` elements of `arr`.
+
+```js
+const firstN = (arr, n) => arr.slice(0, n);
+```
+
+```js
+firstN(['a', 'b', 'c', 'd'], 2); // ['a', 'b']
+```

snippets/lastN.md

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+---
+title: Last n elements
+tags: array
+expertise: beginner
+author: chalarangelo
+cover: blog_images/interior-5.jpg
+firstSeen: 2022-07-23T05:00:00-04:00
+---
+
+Gets the last `n` elements of an array.
+
+- Use `Array.prototype.slice()` with a start value of `-n` to get the last `n` elements of `arr`.
+
+```js
+const lastN = (arr, n) => arr.slice(-n);
+```
+
+```js
+lastN(['a', 'b', 'c', 'd'], 2); // ['c', 'd']
+```