Sum and product of an array: Difference between revisions

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 =={{header|JavaScript}}==
+===ES5===
 <lang javascript>var array = [1, 2, 3, 4, 5],
     sum = 0,
@@ Line 1,132: / Line 1,133: @@
     }, 1);
 alert(sum + ' ' + prod);</lang>
+===ES6===
+<lang JavaScript>(() => {
+    'use strict';
+    // sum :: (Num a) => [a] -> a
+    const sum = xs => xs.reduce((a, x) => a + x, 0);
+    // product :: (Num a) => [a] -> a
+    const product = xs => xs.reduce((a, x) => a * x, 1);
+    // TEST
+    // show :: a -> String
+    const show = x => JSON.stringify(x, null, 2);
+    return show(
+        [sum, product]
+        .map(f => f([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]))
+    );
+})();</lang>
+{{Out}}
+<pre>[
+,
+  3628800
+]</pre>
 =={{header|jq}}==