Naming tweak

Skills/Numerics/BasicMath.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Basic math functions.
+ * 
+ * @author     Jeff Moser <jeff@moserware.com>
+ * @copyright  2010 Jeff Moser 
+ */
+
+/**
+ * Squares the input (x^2 = x * x)
+ * @param number $x Value to square (x)
+ * @return number The squared value (x^2)
+ */
+function square($x)
+{
+    return $x * $x;
+}
+
+/**
+ * Sums the items in $itemsToSum
+ * @param array $itemsToSum The items to sum,
+ * @param callback $callback The function to apply to each array element before summing.
+ * @return number The sum.
+ */
+function sum(array $itemsToSum, $callback )
+{
+    $mappedItems = array_map($callback, $itemsToSum);
+    return array_sum($mappedItems);
+}
+
+?>