isdecl

Purpose: Checks whether the variable or object field given has been previously declared.

Return Values: Returns true if the variable or object field is declared, otherwise false.

Example:

input:	resulting output:
<? isdecl(ff.notdef)>	false
<let defvar=0;? isdecl(defvar)>	true

Tip: If heitml ever generates a "Undefined variable" or "Undefined tuple field" error message, you'll know you forgot to assign or declare a value before attempting to use that variable in an expression.

See Also: isempty().