Checks whether the specified value is a number. This function takes an argument of any type and returns a Boolean value. If the value is a number, the function returns the Boolean value TRUE. If the value is not a number, the function returns the Boolean value FALSE.

Syntax

IsNumber(<value>)

Input

value

Boolean, date, integer, number, string

The value to check.

Output

Boolean

Examples

Assume that you have a form in which there is a text question and a number question. The text question has the reference name first_name and was answered Lee. The number question has the reference name number_of_cars and was answered 2.

• The expression IsNumber($number_of_cars) returns TRUE.
• The expression IsNumber(2) returns TRUE.
• The expression IsNumber(2.0) returns TRUE.
• The expression IsNumber($first_name) returns FALSE.
• The expression IsNumber("Lee") returns FALSE.