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+### inRange
+
+Checks if the given number falls in the given range. 
+
+Use arithmetic comparison to check if the given number is in the specified range.
+If the second parameter, `end`, is not specified, the reange is considered to be from `0` to `start`.
+
+```js
+const inRange = (n, start, end=null) => {
+  if(end && start > end) end = [start, start=end][0];
+  return (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
+```