Hidden Gems

This document explains how to declare a variables, function call with dot and bracket notation, Passing arguments via URL/form scopes as array. Explain this three with simple example below:

Example 1 : Declare variables

// test.cfc

component {
	function getName() {
		return "Susi";
	}
}

// example1.cfm

function test() {
	var qry;
	dump(qry);
	query name="qry" datasource="test" {
		echo("select 1 as one");
	}
	dump(qry);
}
test();

In cfm page have test() function with local variable scope, it normally assigned in empty string var qry. Then execute this cfm, the qry is returns "1".
Then dump the qry below of the var declaration. It returns empty string.

Example 2 : Dot and bracket notation for function calls

Lucee allow you to use bracket notations to call a component function.

//example2.cfm

// UDF call via dot notation
	test=new Test();
	dump( test.getName() );
// Dynamic function name
	funcName="getName";
	dump(evaluate('test.#funcName#()'));
// UDF call via bracket notation
	funcName="getName";
	dump( test[funcName]() );

Here this three different types of function call. There are,

Calling the user defined function getname() from component.
Second type of function call is dynamic function name with evaluate function.
Third type of function call is user defined function via bracket notation.

These all three different function call returns as same content susi what you defined in CFC page.

Example 3 : Passing arguments via URL/form scopes as Array

Lucee allow to pass URL and Form scope data as an Array instead of a string list.

//example3.cfm

<cfscript>
	dump(label:"URL",var:url);
	dump(label:"Form",var:form);
	// current name
	curr=listLast(getCurrentTemplatePath(),'\/');
</cfscript>
<cfoutput>
<h1>Countries</h1>
<form method="post" action="#curr#?country[]=USA&country[]=UAE">
<pre>
Countries Europe:	<input type="text" name="country[]" value="Switzerland,France,Germany" size="30">
Countries America:	<input type="text" name="country[]" value="Canada,USA,Mexico" size="30">
<input type="submit" name="send" value="send">
</pre>
</form>
</cfoutput>

// index.cfm

directory sort="name" action="list" directory=getDirectoryFromPath(getCurrentTemplatePath()) filter="example*.cfm" name="dir";
loop query=dir {
	echo('<a href="#dir.name#">#dir.name#</a><br>');
}

In this cfm page have available in URL and form scopes. Here names are used as same as two times.
Query string on URL scope have same name country as two times. Similarly form also have two same name country.
Execute this cfm page in browser & submit the form. It will showing a single URL string list in merged format instead of two fields & Form fields also merged as single country field.
If we add square bracket behind the name country[] means, it returns as two separated strings in array format. We will see the difference on browser while dumping that name with square bracket.

These simple ways are helpful for defining a variable as different methods.

Footnotes

Here you can see above details in video

Lucee Hidden Gems