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+### inRange
+
+Checks if the given number falls in the given range. 
+
+`end` is an optional parameter. If `end` is not given, the range is considered from 0 to start.  
+
+```js
+const inRange = (n, start, end=null) => (end == null) ? (n>=0 && n<=start) : (n>=start && n<=end);
+
+// inRange(3, 2, 5) -> true
+// inRange(3, 4) -> true
+// inRange(2, 3, 5) -> false
+// inrange(3, 2) -> false
+```
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