Cross Ref > Statements

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

try {

  //Do something.

}

catch(e) {        //one or more.

  //Do something.

}

finally {         //0 or one.

  //Do something.

}

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.

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

Same as C/C++ but, as usual, the semicolons are optional.

var x = 8;

if (x == 10) {
 document.write("x is 10.");
} else if (x < 10) {
 document.write("x is less than 10.");  
} else {
 document.write("x must be greater than 10."); 
}

Notice in the more complete example that the semicolon for the begin..end block after end is not included. That tells the compiler something else is coming (the statement is not finished). Also note the semicolon is missing right before the final "else" statement.

//Complete example:
if x = true then begin 

  ShowMessage('x is true');

end

Else If y = 'Mike' Then 

  ShowMessage('hello mike')

Else 

  ShowMessage('last option');