add Ox.isError, add tests

source/Ox/js/Type.js

@@ -157,13 +157,24 @@ Ox.isEqual = function(a, b) {
     return ret;
 };
 
+/*@
+Ox.isError <f> Tests if a value is an error
+    (value) -> <b> True if the value is an error
+    value <*> Any value
+    > Ox.isError(new Error())
+    true
+@*/
+Ox.isError = function(value) {
+    return Ox.typeOf(value) == 'error';
+};
+
 /*@
 Ox.isFunction <f> Tests if a value is a function
     (value) -> <b> True if the value is a function
     value <*> Any value
     > Ox.isFunction(function() {})
     true
-    > Ox.isFunction(/ /)
+    > Ox.isFunction(new RegExp())
     false
 @*/
 Ox.isFunction = function(value) {
@@ -262,10 +273,14 @@ Ox.isPrimitive <f> Tests if a value is a primitive (boolean, number or string)
     value <*> Any value
     > Ox.isPrimitive(false)
     true
+    > Ox.isPrimitive(null)
+    true
     > Ox.isPrimitive(0)
     true
     > Ox.isPrimitive('')
     true
+    > Ox.isPrimitive()
+    true
     > Ox.isPrimitive([])
     false
     > Ox.isPrimitive({})
@@ -281,7 +296,7 @@ Ox.isPrimitive = function(value) {
 Ox.isRegExp <f> Tests if a value is a regular expression
     (value) -> <b> True if the value is a regular expression
     value <*> Any value
-    > Ox.isRegExp(/ /)
+    > Ox.isRegExp(new RegExp())
     true
 @*/
 Ox.isRegExp = function(value) {
@@ -322,8 +337,12 @@ Ox.typeOf <f> Returns the type of a value
     'boolean'
     > Ox.typeOf(new Date())
     'date'
+    > Ox.typeOf(new Error())
+    'error'
     > Ox.typeOf(function() {})
     'function'
+    > Ox.typeOf(window)
+    'global'
     > Ox.typeOf(document.createElement('a'))
     "htmlanchorelement"
     > Ox.typeOf(document.getElementsByTagName('a'))
@@ -338,12 +357,16 @@ Ox.typeOf <f> Returns the type of a value
     'number'
     > Ox.typeOf({})
     'object'
-    > Ox.typeOf(/ /)
+    > Ox.typeOf(new RegExp())
     'regexp'
     > Ox.typeOf('')
     'string'
     > Ox.typeOf()
     'undefined'
+    > Ox.typeOf(Math)
+    'math'
+    > Ox.typeOf(JSON)
+    'json'
 @*/
 Ox.typeOf = function(value) {
     return Object.prototype.toString.call(value).slice(8, -1).toLowerCase();