Another update from ingydotnet^djgoku

Task/Greatest-element-of-a-list/JavaScript/greatest-element-of-a-list-2.js

@@ -1 +1,99 @@
-Math.max(...[ 0, 1, 2, 5, 4 ]); // 5
+(function () {
+
+    // Generalised max() function
+    // [a] -> (a -> n) -> a
+    function max(list, fnCompare) {
+        return list.reduce(function (acc, b) {
+            var a = acc || b,
+                lngDiff = fnCompare(a, b);
+
+            return lngDiff ? (lngDiff > 0 ? b : a) : a;
+        }, null)
+    }
+
+    // Comparison functions for specific data types
+
+    function wordSortFirst(a, b) {
+        return a === null ? b : a === b ? 0 : a < b ? -1 : 1;
+    }
+
+    function wordSortLast(a, b) {
+        return a === null ? b : a === b ? 0 : a < b ? 1 : -1;
+    }
+
+    function wordLongest(a, b) {
+        var lngA = a ? a.length : b.length,
+            lngB = b.length;
+
+        return lngA === lngB ? 0 : lngA > lngB ? -1 : 1;
+    }
+
+    function cityPopulationMost(a, b) {
+        var nA = a ? a.population : b.population,
+            nB = b.population;
+
+        return nA === nB ? 0 : nA > nB ? -1 : 1;
+    }
+
+    function cityPopulationLeast(a, b) {
+        var nA = a ? a.population : b.population,
+            nB = b.population;
+
+        return nA === nB ? 0 : nA < nB ? -1 : 1;
+    }
+
+    function cityNameSortFirst(a, b) {
+        var sA = a ? a.name : b.name,
+            sB = b.name;
+
+        return sA === sB ? 0 : sA < sB ? -1 : 1;
+    }
+
+    function cityNameSortLast(a, b) {
+        var sA = a ? a.name : b.name,
+            sB = b.name;
+
+        return sA === sB ? 0 : sA > sB ? -1 : 1;
+    }
+
+    var lstWords = [
+            'alpha', 'beta', 'gamma', 'delta', 'epsilon', 'zeta', 'eta',
+            'theta', 'iota', 'kappa', 'lambda'
+        ];
+
+    var lstCities = [
+            {
+                name: 'Shanghai',
+                population: 24.15
+            }, {
+                name: 'Karachi',
+                population: 23.5
+            }, {
+                name: 'Beijing',
+                population: 21.5
+            }, {
+                name: 'Tianjin',
+                population: 14.7
+            }, {
+                name: 'Istanbul',
+                population: 14.4
+            }, , {
+                name: 'Lagos',
+                population: 13.4
+            }, , {
+                name: 'Tokyo',
+                population: 13.3
+            }
+        ];
+
+    return [
+        max(lstWords, wordSortFirst),
+        max(lstWords, wordSortLast),
+        max(lstWords, wordLongest),
+        max(lstCities, cityPopulationMost),
+        max(lstCities, cityPopulationLeast),
+        max(lstCities, cityNameSortFirst),
+        max(lstCities, cityNameSortLast)
+    ]
+
+})();

Task/Greatest-element-of-a-list/JavaScript/greatest-element-of-a-list-3.js

@@ -0,0 +1,21 @@
+[
+  "alpha",
+  "zeta",
+  "epsilon",
+  {
+    "name": "Shanghai",
+    "population": 24.15
+  },
+  {
+    "name": "Tokyo",
+    "population": 13.3
+  },
+  {
+    "name": "Beijing",
+    "population": 21.5
+  },
+  {
+    "name": "Tokyo",
+    "population": 13.3
+  }
+]

Task/Greatest-element-of-a-list/JavaScript/greatest-element-of-a-list-4.js

@@ -0,0 +1 @@
+Math.max(...[ 0, 1, 2, 5, 4 ]); // 5