JavaScript
Errors
Objectives
- Define the term "Error" as it relates to JavaScript.
- Read a "Stack Trace" to extract the following information:
- The line of code where the error occurred.
- The type of error that occurred.
- What path the code traveled to get to that line.
- Use a try/catch block to handle expected errors.
- Throw a custom error.
What are errors...?
var someObject = {
property = 7;
}console.log(undef);var sensibleArray =
new Array(-1);var num = 4;
num();What are errors...?
Impossible!
Unreasonable!
requests
&
How does JS handle errors?
It terminates the whole program...
What if a user submits an invalid email?
try {
} catch(error){
}