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snippets/js/s/fibonacci.md

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+---
+title: Fibonacci
+type: snippet
+language: javascript
+tags: [math,algorithm]
+cover: highlands
+dateModified: 2020-12-28T13:49:24+02:00
+---
+
+Generates an array, containing the Fibonacci sequence, up until the nth term.
+
+- Use `Array.from()` to create an empty array of the specific length, initializing the first two values (`0` and `1`).
+- Use `Array.prototype.reduce()` and `Array.prototype.concat()` to add values into the array, using the sum of the last two values, except for the first two.
+
+```js
+const fibonacci = n =>
+  Array.from({ length: n }).reduce(
+    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
+    []
+  );
+```
+
+```js
+fibonacci(6); // [0, 1, 1, 2, 3, 5]
+```