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► KB ► To/From Guides ► Corel Paradox ► Statements

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Cross Ref > Statements

By Mike Prestwood

Corel Paradox versus JavaScript: A side by side comparison between Corel Paradox and JavaScript.

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.

Corel Paradox: try...onFail

ObjectPAL has a try...onFail statement but does not have a finally-type component. However, the code afer endTry will execute.

try

onFail

endTry

Syntax Example:

var
  i SmallInt
endVar

try
  i = 0
  i = 1/i
onFail
  msgInfo("", "You cannot divide by zero.")
endTry

Debugging ObjectPAL Code

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.

If Statement

[Other Languages]

Corel Paradox: If..Else..EndIf, or switch

ObjectPAL supports a simple If...Else...EndIf statement.

Notice ObjectPAL does not support an ElseIf feature as part of an if statement. Instead use a switch statement

Syntax Example: 1 certification question.

'Does ObjectPAL evaluate the math correctly? No!

If (.1 + .1 + .1) = .3 Then
  msgInfo("", "Correct")
Else
  msgInfo("", "Not correct")
EndIf

'Switch statement example.
switch
  case x = "Nate": MsgInfo("", "Hi Nate")
  case x = "Felicia": MsgInfo("", "Hi Felly")

  otherwise: MsgInfo("", "Who are you?")

endSwitch

JavaScript: if..else if..else

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

Syntax Example:

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."); 
}