# IsBoolean

Returns TRUE if value can be converted to a Boolean; otherwise, FALSE.

See also IsNumeric and YesNoFormat.

### Syntax

    IsBoolean(value)

##### value

Any number or string.

### Examples

    <!--- This example shows the use of IsBoolean --->
    <HTML>
    <HEAD>
    <TITLE>
    IsBoolean Example
    </TITLE>
    </HEAD>

    <BODY BGCOLOR=silver>
    <H3>IsBoolean Example</H3>

    <CFIF IsDefined("FORM.theTestValue")>
        <CFIF IsBoolean(FORM.theTestValue)>
        <H3>The expression <CFOUTPUT>#DE(FORM.theTestValue)#</CFOUTPUT>
          is Boolean</H3>
        <CFELSE>
        <H3>The expression <CFOUTPUT>#DE(FORM.theTestValue)#</CFOUTPUT>
          is not Boolean</H3>
        </CFIF>
    </CFIF>

    <FORM ACTION="isBoolean.cfm" METHOD="POST">
    <P>Enter an expression, and discover if
    it can be evaluated to a Boolean value.

    <INPUT TYPE="Text" NAME="TheTestValue" VALUE="1">
    <INPUT TYPE="Submit" VALUE="Is it Boolean?" NAME="">
    </FORM>
    </BODY>
    </HTML>