Initial data commit

Task/Reverse-a-string/JavaScript/reverse-a-string-4.js

@@ -0,0 +1,18 @@
+(() => {
+
+    // .reduceRight() can be useful when reversals
+    // are composed with some other process
+
+    let reverse1 = s => Array.from(s)
+        .reduceRight((a, x) => a + (x !== ' ' ? x : ' <- '), ''),
+
+        // but ( join . reverse . split ) is faster for
+        // simple string reversals in isolation
+
+        reverse2 = s => s.split('').reverse().join('');
+
+
+    return [reverse1, reverse2]
+        .map(f => f("Some string to be reversed"));
+
+})();