Chapter 6.2: Handling Errors

GLang provides a safe way to handle errors and unsafe situations using try and catch.

try {
    1 / 0; # error!
} catch error {
    bark("Some error occurred: " + error);
}

In this example, the try block runs first. If an error occurs, GLang automatically jumps to the catch block. The catch block takes an identifier (in this case, error) that stores a string describing what went wrong.

When this code runs, you’ll see something like:

Some error occurred: division by zero

After handling the error, the program continues running normally. try and catch tell GLang to attempt the code in try, and if it fails, handle the issue inside of catch before moving on.

Your Challenge 🤔

Use try and catch to attempt to access an undefined variable named y. Define the variable with the value 10 if it fails to access it.

Answer

try {
    y;
} catch error {
    obj y = 10;
}