Javascript Errors exceptions and handling

-Error:

• There might be alot of errors in your code which you cant see or know what is it maybe you'll put a double into integer variable and this is an error maybe the browser console"compiler" wont see this an error but it might cause a problem for your project

-Try statement:

• this statements is used to check the code from errors but it wont show that error it'll just find it and throw it to another statements which called "Catch"

-Catch statement:

• it'll handle the error from the try block and catch it and then you can print it to show your error 
• so Try statements wont work by itself and catch statement doesn't have a value without the Try so there isnt a Try statement without a catch statement.

-Finally:

• its an extra component which has code into it that will run after the try is clean of errors and the catch didn't get any error 
•  we all know what the function "alert" do it shows up a message text box into your screen and it has a  text 
• lets see this example:

why this is an error because there isn't a function called "alerttt" so this will produce an error and it'll be like this:

thats the error.

• the catch parameter "err" is the error the the try statement could find it  so it'll pass it to the catch function by a parameter

-Related to this post:

• Javascript Functions