# Function components in `ng`

Name | Description
--- | ---
angular.lowercase | Converts the specified string to lowercase.
angular.uppercase | Converts the specified string to uppercase.
angular.forEach | Invokes the `iterator` function once for each item in `obj` collection, which can be either an object or an array. The `iterator` function is invoked with `iterator(value, key)`, where `value` is the value of an object property or an array element and `key` is the object property key or array element index. Specifying a `context` for the function is optional.
angular.extend | Extends the destination object `dst` by copying all of the properties from the `src` object(s) to `dst`. You can specify multiple `src` objects.
angular.noop | A function that performs no operations. This function can be useful when writing code in the functional style.
         function foo(callback) {
           var result = calculateResult();
           (callback || angular.noop)(result);
         }
angular.identity | A function that returns its first argument. This function is useful when writing code in the functional style.
angular.isUndefined | Determines if a reference is undefined.
angular.isDefined | Determines if a reference is defined.
angular.isObject | Determines if a reference is an `Object`. Unlike `typeof` in JavaScript, `null`s are not considered to be objects. Note that JavaScript arrays are objects.
angular.isString | Determines if a reference is a `String`.
angular.isNumber | Determines if a reference is a `Number`.
angular.isDate | Determines if a value is a date.
angular.isArray | Determines if a reference is an `Array`.
angular.isFunction | Determines if a reference is a `Function`.
angular.isElement | Determines if a reference is a DOM element (or wrapped jQuery element).
angular.copy | Creates a deep copy of `source`, which should be an object or an array.
angular.equals | Determines if two objects or two values are equivalent. Supports value types, regular expressions, arrays and objects.
angular.bind | Returns a function which calls function `fn` bound to `self` (`self` becomes the `this` for `fn`). You can supply optional `args` that are prebound to the function. This feature is also known as partial application, as distinguished from function currying.
angular.toJson | Serializes input into a JSON-formatted string. Properties with leading $$ characters will be stripped since angular uses this notation internally.
angular.fromJson | Deserializes a JSON string.
angular.bootstrap | Use this function to manually start up angular application.
angular.injector | Creates an injector function that can be used for retrieving services as well as for dependency injection (see dependency injection).
angular.element | Wraps a raw DOM element or HTML string as a jQuery element.
angular.module | The `angular.module` is a global place for creating, registering and retrieving Angular modules. All modules (angular core or 3rd party) that should be available to an application must be registered using this mechanism.