CFLib.org – Common Function Library Project

Description:
isBit checks to see if a value is 1 or 0. This comes in handy when checking radio button values where you have two radio buttons with bit values. While this does not save a lot of typing, it does help, especially when your form has an abundance of radio buttons, etc.

Return Values:
Returns a boolean.

Example:

<cfset var1 = 1 />
<cfset var2 = "1" />
<cfset var3 = "test string" />
<cfset var4 = "-0" />
<cfset var5 = 000 />
<cfset var6 = arrayNew(1) />
<cfset var7 = 0 />

<cfoutput>
#isBit(var1)# - true<br />
#isBit(var2)# - true<br />
#isBit(var3)# - false<br />
#isBit(var4)# - false<br />
#isBit(var5)# - false<br />
#isBit(var6)# - false<br />
#isBit(var7)# - true<br />
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Checks that a value is equal to 1 or 0.
 * 
 * @param x      Value to check. (Required)
 * @return Returns a boolean. 
 * @author Mike Tangorre (mtangorre@cfcoder.com) 
 * @version 1, February 14, 2006 
 */
function isBit(x){
   if(isSimpleValue(x) and len(x) eq 1 and (x eq 0 or x eq 1))
      return true;
   else
      return false;
}