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THE META-HTML LANGUAGE REFERENCE MANUAL
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Name: VAR-EXISTS
Section:
Variables
Synopsis:
Description:
var-exists
checks for the existence of
the variable named by VARNAME, and returns true
if that variable exists.
The existence of a variable has nothing to do with its value -- a variable exists if it has been created with set-var
, and doesn't exist after it has been unset with unset-var
.
<set-var foo=1 bar>
<var-exists foo> --> true
<var-exists bar> --> true
<get-var bar> -->
<unset-var foo>
<var-exists foo> -->
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The
META-HTML
Reference Manual V1.4
Copyright © 1995, 1996,
Brian J. Fox,
1996, 1997 Universal Access Inc.
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bug-manual@metahtml.com