Angular Global API is a combination of global JavaScript functions for performing various common tasks like:
* Comparing objects
* Iterating objects
* Converting data
There are some common Angular Global API functions like:
angular. lowercase : Converts a string to lowercase string.
angular. uppercase : Converts a string to uppercase string.
angular. isString : Returns true if the current reference is a string.
angular. isNumber : Returns true if the current reference is a number.
