Dot product: Difference between revisions

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 ===ES6===
-Composing functional primitives into a '''dotProduct()''' which returns '''undefined''' (rather than an error) when the array lengths are unmatched.
+Composing functional primitives into a '''dotProduct()''' which returns a '''null''' value (rather than an error) when the array lengths are unmatched.
 <syntaxhighlight lang="javascript">(() => {
@@ Line 1,597: / Line 1,597: @@
     // ------------------- DOT PRODUCT -------------------
-    // dotProduct :: [Num] -> [Num] -> Num
+    // dotProduct :: [Num] -> [Num] -> Either Null Num
     const dotProduct = xs =>
         ys => xs.length === ys.length
             ? sum(zipWith(mul)(xs)(ys))
-            : undefined;
+            : null;