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       
(Showing Draft Content)

Operators

ActiveReportsJS expressions support the following types of operators. The operands of an operator could be expressions, such as references. This section describes the operators and contains examples of usage.

Arithmetic operators

An arithmetic operator takes numerical values as its operands and returns a single numerical value.

  • + : addition

  • - : subtraction

  • * : multiplication

  • / : division

  • \ : the integer division operator discards the remainder left over when one operand is divided by a second operand.

  • ^ : returns the result of raising the first operand to the power of the second operand.

  • Mod : returns the remainder left over when one operand is divided by a second operand.

For example, the Get Started with Fixed Layout Reports Demo uses the following expression to calculate the invoice total.

{Sum(Quantity * UnitPrice * (1 - Discount))}

Comparison operators

A comparison operator compares its operands and returns a boolean value based on whether the comparison is true.

  • < : returns true if the left operand is less than the right operand.

  • <= : returns true if the left operand is less than or equal to the right operand.

  • > : returns true if the left operand is greater than the right operand.

  • >= : returns true if the left operand is greater than or equal to the right operand.

  • = : returns true if the operands are equal.

  • <> : returns true if the operands are not equal.

  • Like : returns true is the left operand matches the right operand that can include regular characters and wildcard characters:

    • % : any string of zero or more characters

    • _ : any single character

    • [ ] : any single character within the range like [a-c] or set like [faceod].

    • [^] : any single character not within the range

  • Is : returns true if both the left operand and the right operand are the same object references. It is useful to check whether a data set field value is Null. For instance, the Get Started with Banded Reports demo uses the following expression to display a placeholder picture is an employee does not have a photo

{IIF(AvatarUrl Is Null, "https://demodata.mescius.io/images/contoso/EmployeePhotos/no-photo.jpg", "https://demodata.mescius.io" + AvatarUrl)}

String operators

The + and & operators concatenate two string values together, returning another string that is the union of the two operand strings. This is rarely needed with the interpolation syntax.

Logical operators

Logical operators are used with boolean values.

  • And : returns true if both operands are true

  • Not : returns false if its operand is ```true`` and vice versa

  • Or : returns true if either operand is true

  • Xor : returns true if one of its operands is true. Returns false, if both operands are true or false

  • AndAlso : evaluates the left operand and if it is false, then stop processing and returns false. Otherwise evaluates the right operand and returns true if it is true.

  • OrElse : evaluates the left operand and if it is true, then stop processing and returns true. Otherwise evaluates the right operand and returns true if it is true.

Bitwise operators

A bitwise operator treats their operands as a set of bits rather than as decimal numbers.

  • << : shifts the left operand in binary representation to the number of bits specified in the right operand to the left, shifting in zeros from the right.

  • >> : shifts the left operand in binary representation to the number of bits specified in the right operand to the right, discarding bits shifted off.