AngularJS Built-in Functions

Before proceeding with this topic, I would like that you first go through the basics of AngularJS by visiting the following links:

• Fundamentals Of AngularJS
• Basics Of AngularJS Controller
• Directives in AngularJS

Now in this article I will share some knowledge about AngularJS built-in functions. Some of the functions are:

1. UpperCase(str)
   
   This AngularJS function is used to convert a lowercase letter to uppercase.
   
   Example
   
   Here in this example I have explained how to convert a lowercase letter to uppercase.
   
   The code for the controller part and the UI part is shown in the following screenshot:
   
   
   
   The UI will be like the following:
   
   
   
   After clicking the button the text will change to uppercase as in the following:
   
   
   
   
2. LowerCase(str)
   
   This AngularJS function converts an uppercase letter to lowercase.
   
   Example
   
   Here, I explained how to convert an uppercase letter to lowercase on button click.
   
   
   
   The UI will be like the following:
   
   
   
   After clicking the button, you can see the following result:
   
   
   
   
3. forEach(obj, iterator, [context])
   
   This function is used to read each element or iterate through each element from an array.
   
   Example
   
   Here I have explained how to read each element of an array using a foreach loop.
   
   
   
   The following is the UI:
   
   
   
   When we click the button the result will be the following:
   
   
   
   
4. extend({}, obj1, obj2,)
   
   The extend method will be similar to a copy and paste operation. It will copy data from one or more sources and then paste it in another source or destination.
   
   Example
   
   Here I have explained how to copy elements from one source and paste in another destination.
   
   
   
   The following is the UI:
   
   
   
   After clicking the button the following will be the result:
   
   
   
   
5. isString(value)
   
   This function is used to check if it is a string or not. If it is a string it will return true else it will return false.
   
   Example
   
   Here is the code for that:
   
   
   
   The UI is:
   
   
   
   And the following is the output after clicking the button:
   
   
   
   
6. IsNumber(value): This is used for checking if a value is a number or not. If it is a number it will return true else it will return false.
   
   Example
   
   Here I will explain it using the following example:
   
   
   
   The following is the UI:
   
   
   
   The output will be the following:
   
   
   
   
7. isArray(value)
   
   This function is used to check if the value is an array or not.
   
   Example
   
   
   
   The following is the UI:
   
   
   
   The following is the output:
   
   
   

Here in this tutorial I explained these functions. In my future articles I will explain all the remaining functions. I hope this article will provide much more clarity about the functions in AngularJS.