Initial data commit

Task/Even-or-odd/JavaScript/even-or-odd-1.js

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+function isEven( i ) {
+  return (i & 1) === 0;
+}

Task/Even-or-odd/JavaScript/even-or-odd-2.js

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+function isEven( i ) {
+  return i % 2 === 0;
+}
+
+// Alternative
+function isEven( i ) {
+  return !(i % 2);
+}

Task/Even-or-odd/JavaScript/even-or-odd-3.js

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+// EMCAScript 6
+const isEven = x => !(x % 2)

Task/Even-or-odd/JavaScript/even-or-odd-4.js

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+(() => {
+    'use strict';
+
+    // even : Integral a => a -> Bool
+    const even = x => (x % 2) === 0;
+
+    // odd : Integral a => a -> Bool
+    const odd = x => !even(x);
+
+
+    // TEST ----------------------------------------
+    // range :: Int -> Int -> [Int]
+    const range = (m, n) =>
+        Array.from({
+            length: Math.floor(n - m) + 1
+        }, (_, i) => m + i);
+
+    // show :: a -> String
+    const show = JSON.stringify;
+
+    // xs :: [Int]
+    const xs = range(-6, 6);
+
+    return show([xs.filter(even), xs.filter(odd)]);
+})();