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Exception Trapping (JavaScript and Delphi Prism Cross Reference Guide)

By Mike Prestwood

JavaScript versus Delphi Prism: A side by side comparison between JavaScript and Delphi Prism.

 
Statements
 

Common statements such as if statements, loops, etc.

Exception Trapping

[Other Languages] 

Languages Focus

A common usage of exception handling is to obtain and use resources in a "try-it" block, deal with any exceptions in an "exceptions" block, and release the resources in some kind of "final" block which executes whether or not any exceptions are trapped.

JavaScript:   try/catch/finally

See "throw" to raise (throw) an error.

Syntax Example:
try {
  //Do something.
}
catch(e) {        //one or more.
  //Do something.
}
finally {         //0 or one.
  //Do something.
}
Delphi Prism:   try..except, try..finally

Use a try..except..end block to trap and process errors.

Delphi also offers a try...finally where code will execute in the finally section no matter what. It's common to put a try..except inside a try..finally.

Syntax Example:
try
  var y: Integer;
  y := 0;
  y := 1/y;
except
  MessageBox.Show("You cannot divide by zero.");
end;












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