Initial commit

.gitignore

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+node_modules

package.json

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+{
+  "name": "fantasy-validations",
+  "version": "0.0.0",
+  "description": "Validation data structure.",
+  "main": "validation.js",
+  "scripts": {},
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/puffnfresh/fantasy-validations.git"
+  },
+  "keywords": [
+    "fantasyland",
+    "validation",
+    "applicative"
+  ],
+  "author": "Brian McKenna",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/puffnfresh/fantasy-validations/issues"
+  },
+  "dependencies": {
+    "daggy": "0.0.1"
+  }
+}

validation.js

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+var daggy = require('daggy'),
+    Validation = daggy.taggedSum({
+        Success: ['s'],
+        Failure: ['f']
+    });
+
+function identity(a) {
+    return a;
+}
+
+// Methods
+Validation.prototype.fold = function(f, g) {
+    return this.cata({
+        Failure: f,
+        Success: g
+    });
+};
+Validation.of = Validation.Success;
+Validation.prototype.bimap = function(f, g) {
+    return this.fold(
+        function(a) {
+            return Validation.Failure(f(a));
+        },
+        function(b) {
+            return Validation.Success(g(b));
+        }
+    );
+};
+Validation.prototype.map = function(f) {
+    return this.bimap(identity, f);
+};
+Validation.prototype.ap = function(b) {
+    return this.fold(
+        function(f) {
+            return Validation.Failure(f);
+        },
+        function(s) {
+            return b.map(s);
+        }
+    );
+};
+Validation.prototype.concat = function(b) {
+    return this.fold(
+        function(f) {
+            return b.bimap(
+                function(g) {
+                    return f.concat(g);
+                },
+                identity
+            );
+        },
+        function(s) {
+            return b.map(function(d) {
+                return s.concat(d);
+            });
+        }
+    );
+};
+
+// Export
+if(typeof module != 'undefined')
+    module.exports = Validation;