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bennadel/fail-1.cfm

Created February 25, 2014 13:39
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The Elvis Operator vs. IsNull() In ColdFusion 11 Beta
Raw
fail-1.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing unscoped values.
elvis = ( theKing ?: "default" );
nully = ( isNull( theKing ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-10.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing function results.
public any function getNothing() {
return;
}
elvis = ( getNothing() ?: "default" );
nully = ( isNull( getNothing() ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
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fail-11.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing undefined return values (native methods).
values = [];
noop = function() {};
elvis = ( values.each( noop ) ?: "default" );
nully = ( isNull( values.each( noop ) ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
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fail-12.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing function results as containers.
public any function getNullContainer() {
return;
}
elvis = ( getNullContainer().foo ?: "default" );
nully = ( isNull( getNullContainer().foo ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-13.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing function results as containers.
public any function getNullContainer2() {
return;
}
elvis = ( getNullContainer2()[ "foo" ] ?: "default" );
nully = ( isNull( getNullContainer2()[ "foo" ] ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-14.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing undefined arguments.
public any function testArguments( string theKing ) {
elvis = ( theKing ?: "default" );
nully = ( isNull( theKing ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
}
testArguments();
</cfscript>
Raw
fail-15.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing non-enabled sessions.
elvis = ( session ?: "default" );
nully = ( isNull( session ) ? "default" : session );
writeOutput( "Elvis: " & isStruct( elvis ) & "<br />" );
writeOutput( "Nully: " & isStruct( nully ) & "<br />" );
</cfscript>
Raw
fail-16.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing custom tag's CALLER scope.
parent = {};
cf_tagfail();
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-2.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing scoped values.
elvis = ( url.theKing ?: "default" );
nully = ( isNull( url.theKing ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-3.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing bracket notation.
elvis = ( url[ "theKing" ] ?: "default" );
nully = ( isNull( url[ "theKing" ] ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-4.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing deeply-nested values.
elvis = ( url.foo.bar ?: "default" );
nully = ( isNull( url.foo.bar ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-5.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing strict null values.
javaNull = javaCast( "null", "" );
elvis = ( javaNull ?: "default" );
nully = ( isNull( javaNull ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-6.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing strict null members.
request.strictNull = javaCast( "null", "" );
elvis = ( request.strictNull ?: "default" );
nully = ( isNull( request.strictNull ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-7.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing undefined array index.
values = [];
values[ 2 ] = 2;
elvis = ( values[ 1 ] ?: "default" );
nully = ( isNull( values[ 1 ] ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-8.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing out-of-bounds array index.
values = [];
elvis = ( values[ 2 ] ?: "default" );
nully = ( isNull( values[ 2 ] ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
fail-9.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing out-of-bounds list index.
list = "a,b,c";
elvis = ( list.getAt( 5 ) ?: "default" );
nully = ( isNull( list.getAt( 5 ) ) ? "default" : "false-positive" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
pass-1.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing "undefined" CGI members.
elvis = ( form ?: "false-negative" );
nully = ( isNull( form ) ? "false-negative" : form );
writeOutput( "Elvis: " & isStruct( elvis ) & "<br />" );
writeOutput( "Nully: " & isStruct( nully ) & "<br />" );
// NOTE: Long-standing issue.
// http://www.bennadel.com/blog/1773-IsNull-vs-IsDefined-For-ColdFusion-9-Scope-Detection.htm
</cfscript>
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pass-2.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing "undefined" CGI members.
elvis = ( cgi.cf11 ?: "false-negative" );
nully = ( isNull( cgi.cf11 ) ? "false-negative" : "" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
pass-3.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing new "member" functions.
value = "ColdFusion 11";
elvis = ( value.ucase() ?: "false-negative" );
nully = ( isNull( value.ucase() ) ? "false-negative" : "" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
pass-4.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing Java functions.
values = [ 1 ];
elvis = ( values.size() ?: "false-negative" );
nully = ( isNull( values.size() ) ? "false-negative" : "" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
pass-5.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing Java functions.
request.getSomething = function() {
return( true );
};
elvis = ( request.getSomething() ?: "false-negative" );
nully = ( isNull( request.getSomething() ) ? "false-negative" : "" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
pass-6.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing first-class native functions.
elvis = ( ucase ?: "false-negative" );
nully = ( isNull( ucase ) ? "false-negative" : "" );
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
pass-7.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing user defined functions
public any function noop() {
return;
}
elvis = ( noop ?: "false-negative" );
nully = ( isNull( noop ) ? "false-negative" : noop );
writeOutput( "Elvis: " & isCustomFunction( elvis ) & "<br />" );
writeOutput( "Nully: " & isCustomFunction( nully ) & "<br />" );
</cfscript>
Raw
pass-8.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
// Testing custom tag's CALLER scope.
parent = {
member: "exists"
};
cf_tagpass();
writeOutput( "Elvis: " & elvis & "<br />" );
writeOutput( "Nully: " & nully & "<br />" );
</cfscript>
Raw
philosophy.cfm
<!--- NOTE: ColdFusion 11 was in BETA at the time of this writing. --->
<cfscript>
value = ( url.foo ?: "bar" );
// ------------------------------------------------------ //
// ------------------------------------------------------ //
value = ( isNull( url.foo ) ? "bar" : url.foo );
// ------------------------------------------------------ //
// ------------------------------------------------------ //
if ( isNull( url.foo ) ) {
value = "bar";
} else {
value = url.foo;
}
// ------------------------------------------------------ //
// ------------------------------------------------------ //
// NOTE: This one is a little different since it's actually
// changing the state of url.foo.
cfparam( name = "url.foo", default = "bar" );
value = url.foo;
</cfscript>
Raw
tagfail.cfm
<cfscript>
caller.elvis = ( caller[ "parent.member" ] ?: "default" );
caller.nully = ( isNull( caller[ "parent.member" ] ) ? "default" : "false-positive" );
</cfscript>
Raw
tagpass.cfm
<cfscript>
caller.elvis = ( caller[ "parent.member" ] ?: "false-negative" );
caller.nully = ( isNull( caller[ "parent.member" ] ) ? "false-negative" : caller[ "parent.member" ] );
</cfscript>
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