reworked patterns + some docs...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

README.md

@@ -6,6 +6,7 @@ XXX Intro
 	- [Motivation](#motivation)
 		- [Goals / Features](#goals--features)
 	- [General](#general)
+	- [Installation and loading](#installation-and-loading)
 		- [Diff](#diff)
 			- [Diff class API](#diff-class-api)
 			- [Diff object API](#diff-object-api)
@@ -41,6 +42,45 @@ XXX alternatives
 
 ## General
 
+```javascript
+var {Diff, cmp} = require('object-diff')
+
+
+var Bill = {
+	name: 'Bill',
+	age: 20,
+	hair: 'black',
+	skills: [
+	],
+}
+
+var Ted = {
+	name: 'Ted',
+	age: 20,
+	hair: 'blond',
+	skills: [
+	],
+}
+
+var diff = Diff(Bill, Ted)
+
+// XXX examine the diff...
+
+var PERSON = {
+	name: STRING,
+	age: NUMBER,
+	hair: STRING,
+	skills: ARRAY(STRING),
+}
+
+// we can "type-check" things...
+cmp(Bill, PERSON)
+
+```
+
+
+## Installation and loading
+
 Install the package:
 ```shell
 $ npm install --save object-diff

diff.js

@@ -286,13 +286,38 @@ object.makeConstructor('LogicType',
 
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
-// Singleton, will compare to anything as true...
+// Singletons...
+var makeSingletonPattern = function(name, check){
+	return new (object.makeConstructor(
+		name, 
+		Object.assign(new LogicType(), { __cmp__: check })))() }
+
 var ANY = 
 module.ANY = 
-new (object.makeConstructor('ANY', Object.assign(new LogicType(), {
-	__cmp__: function(obj, cmp){ 
-		return true },
-})))()
+	makeSingletonPattern('ANY', 
+		function(obj, cmp){ return true }) 
+
+// XXX should support regexp as arg...
+var STRING = 
+module.STRING = 
+	makeSingletonPattern('STRING', 
+		function(obj, cmp){ 
+			return obj === STRING || typeof(obj) == typeof('str') }) 
+
+// XXX support range checking, ...
+var NUMBER = 
+module.NUMBER = 
+	makeSingletonPattern('NUMBER', 
+		function(obj, cmp){ 
+			return obj === NUMBER || typeof(obj) == typeof(123) }) 
+
+// XXX support length, types, ...
+var ARRAY = 
+module.ARRAY = 
+	makeSingletonPattern('ARRAY', 
+		function(obj, cmp){ 
+			return obj === ARRAY || obj instanceof Array }) 
+
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 // Will compare as true to anything but .value...
@@ -344,8 +369,9 @@ object.makeConstructor('AND', Object.assign(new LogicType(), {
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 // Will match a number greater than or equal to min and less than max... 
-var NUMBER = 
-module.NUMBER = 
+// XXX rename...
+var _NUMBER = 
+module._NUMBER = 
 object.makeConstructor('NUMBER', Object.assign(new LogicType(), {
 	__cmp__: function(obj, cmp){
 		if(typeof(obj) == 'number'