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Unary Operators (JavaScript and Delphi Prism Cross Reference Guide)

By Mike Prestwood

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

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Unary Operators

[Other Languages]

General Info: Unary Operator

An operation with only one operand (a single input). Common unary operators include + plus, - minus, and bitwise not. Some operators can function as both unary and binary operators. For example, + and - operators can serve as either.

Languages Focus

What unary operators are supported in additoin to the standard plus, minus, and bitwise not.

JavaScript:

An operation with only one operand (a single input). JavaScript unary operators include ++ and --. They can be used either before or after a variable as in: a++, b--, and ++a, and --b.

Examples:

iCounter++;

iCounter--;

++iCounter;

--iCounter;

Syntax Example:

var iCounter=0;

for (iCounter=0;iCounter<=5;iCounter++)
{
  document.write("Count is " + iCounter + "<br>");
}

JavaScript Unary Operators

Delphi Prism:

The obvious Prism unary operators are +, -, and Not.

+	Plus
-	Minus
Not	Bitwise Not
Inc()	Increment
Dec()	Decrement

Syntax Example:

var i: Integer := 1;
Inc(i);
MessageBox.Show("" + i);  //Displays 2

Delphi Prism Unary Operators