Fibonacci and random

snippets/fibonacci-array-generator.md

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+### Fibonacci array generator
+
+Create an empty array of the specific length, initializing the first two values (`0` and `1`).
+Use `reduce()` to add values into the array, using the sum of the last two values, except for the first two.
+
+```js
+var fibonacci = n =>
+  Array.apply(null, [0,1].concat(Array(n-2))).reduce(
+    (acc, val, i) => {
+      acc.push( i>1 ? acc[i-1]+acc[i-2] : val);
+      return acc;
+    },[]);
+```

snippets/random-number-in-range.md

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+### Random number in range
+
+Use `Math.random()` to generate a random value, map it to the desired range using multiplication.
+
+```js
+var randomInRange = (min, max) => Math.random() * (max - min) + min;
+```

snippets/randomize-order-of-array.md

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+### Randomize order of array
+
+Use `sort()` to reorder elements, utilizing `Math.random()` to randomize the sorting.
+
+```js
+var randomizeOrder = arr => arr.sort( (a,b) => Math.random() >= 0.5 ? -1 : 1)
+```