throw

Description

Intentionally throw an error. When you throw an error, the normal flow of code execution stops, and control is passed to the nearest catch block, while passing the error message.

Input / Parameter

Name	Description	Input Type	Default	Options	Required
value	The error message to throw.	Text/String	-	-	No

Output

N/A

Callback

N/A

Example

In this example, we will do console logging by using console and throw function in tryCatch function callback to demonstrate how throw works.

Code Equivalent

try {
  throw new Error("There is an error");
} catch (e) {
  console.log(e)
} finally {
  console.log("finally");
}

Steps

1. Drag a button component into the canvas and open the Action tab. Select the press event of the button and drag the tryCatch function to the event flow.

   
2. Drag the function throw to the tryCatch function try callback, on it's value param add error from throw as value.

   
3. Drag the function console to the tryCatch function catch callback, on it's value param change the param type to input.

   
4. Drag the function console to the tryCatch function catch callback, on it's value param add finally as value.

   

Result

1. Now click the button in preview, it will only show error from throw and finally on the console.

   

Links

Related Information

See also:

• Functions

  • console

  • tryCatch