If you write script that has a lot String content mixed with variables, I'm sure you're doing a lot of heavy concatenation.
Building string combos with quotes and apostrophes sprinkled all over a script gets confusing. The way I like to keep this confusion to a minimum is to write my static markup separately. This allows me to make sure it shows up as intended. Then I concatenate my variables in all the places that need to have dynamic content.

Taking static markup or script and wrapping quotes around every line is a chore so I made this Concatenation Tool to help with that.

Currently I've only made this support languages I'm using mostly. If I have to use a new language I'd just add it in.

Below are some basic use case examples of where a concatenation tool can be useful.

JavaScript
Concatenating a content to add to a Jquery UI Dialog.
In this example I purposely used he "text()" method to show the XML content instead of "html()".

    <script type="text/javascript">
                $(document).ready(function(){
                var ns = "";
                ns += "<LIBRARY>";
                ns += "    <BOOK>";
                ns += "        <TITLE id=\"2356\">Charlotte's Web</TITLE>";
                ns += "        <AUTHOR>E. B. White</AUTHOR>";
                ns += "        <FAMOUS_SAYING>\"Always be on the lookout for the presence of wonder.\"</FAMOUS_SAYING>";
                ns += "    </BOOK>";
                ns += "    <BOOK>";
                ns += "        <TITLE id=\"95\">Scuffy the Tugboat</TITLE>";
                ns += "        <AUTHOR>Gertrude Crampton</AUTHOR>";
                ns += "        <FAMOUS_SAYING>\"Toot, tooot!\" cried the frightened tugboat.</FAMOUS_SAYING>";
                ns += "    </BOOK>";
                ns += "</LIBRARY>";
                $("#myDialog").dialog({width:400, height:400});
                $("#myDialog p").text(ns);
                });
    </script>

Python
Concatenating with qoutes

ns = ""
ns += "<LIBRARY>"
ns += "    <BOOK>"
ns += "        <TITLE id=\"2356\">Charlotte's Web</TITLE>"
ns += "        <AUTHOR>E. B. White</AUTHOR>"
ns += "        <FAMOUS_SAYING>\"Always be on the lookout for the presence of wonder.\"</FAMOUS_SAYING>"
ns += "    </BOOK>"
ns += "    <BOOK>"
ns += "        <TITLE id=\"95\">Scuffy the Tugboat</TITLE>"
ns += "        <AUTHOR>Gertrude Crampton</AUTHOR>"
ns += "        <FAMOUS_SAYING>\"Toot, tooot!\" cried the frightened tugboat.</FAMOUS_SAYING>"
ns += "    </BOOK>"
ns += "</LIBRARY>"
print(ns)

Python concatenation with triple quotes to preserve the carriage returns

ns="""<LIBRARY>
    <BOOK>
        <TITLE id="2356">Charlotte's Web</TITLE>
        <AUTHOR>E. B. White</AUTHOR>
        <FAMOUS_SAYING>"Always be on the lookout for the presence of wonder."</FAMOUS_SAYING>
    </BOOK>
    <BOOK>
        <TITLE id="95">Scuffy the Tugboat</TITLE>
        <AUTHOR>Gertrude Crampton</AUTHOR>
        <FAMOUS_SAYING>"Toot, tooot!" cried the frightened tugboat.</FAMOUS_SAYING>
    </BOOK>
</LIBRARY>"""
print(ns)

Concatenation with regular quotes

Concatenation of blocks of text with triple quotes

JSFL
Concatenating a XUL markup string for building Flash IDE Panel with JSFL.

if(fl.documents.length == 0){
	fl.createDocument("timeline");
}
//------------------------------------------------------------
//An existing folder for the panel's source to be written to.
//------------------------------------------------------------
var appFolderName="jsflUI_sample";
var date=new Date();
function writePanelSource()
{
	var code = '';
	code += '<overlay>';
	code += '	<dialog id="app" title="Sample UI">';
	code += '		<hbox>';
	code += '			<spacer/>';
	code += '			<button id="b0" label="Button"/>';
	code += '		</hbox>';
	code += '		<separator/>';
	code += '		<vbox>';
	code += '			<label control="f0" value="Field 1" align="left"/>';
	code += '			<textbox id="f0" size="50" value="'+date.toString()+'"/>';
	code += '			<label control="f1" value="Field 2:" align="left"/>';
	code += '			<textbox id="f1" size="50" value=""/>';
	code += '		</vbox>';
	code += '		<checkbox id="cb0" label="Checkbox 1" checked="false" />';
	code += '		<checkbox id="cb1" label="Checkbox 2" checked="false" />';
	code += '	</dialog>';
	code += '</overlay>';
	FLfile.write(fl.configURI + "Commands/"+appFolderName+"/panelsource.xml", code);
	return code;
}

//----------------------------------------------------------------
//Writes the markup to "appFolderName" of Flash's "Commands folder
//----------------------------------------------------------------
writePanelSource();

//-------------------------------
//Open the Panel in Flash's IDE
//-------------------------------
fl.getDocumentDOM().xmlPanel(fl.configURI + "Commands/"+appFolderName+"/panelsource.xml");

Panel UI dialog from JSFL

SharePoint
Concatenating CAML querys.

function getListData()
{
	var clientContext = new SP.ClientContext.get_current();
	var web = clientContext.get_web();
	var userInfoList = web.get_lists().getByTitle('user_list')
	var camlQuery = new SP.CamlQuery();
	var caml = '';
	caml += '<View>';
	caml += '	<Query>';
	caml += '		<OrderBy>';
	caml += '			<FieldRef Name="Title" Ascending="False" />';
	caml += '		</OrderBy>';
	caml += '	</Query>';
	caml += '</View>';
	camlQuery.set_viewXml(caml);
	collListItem = userInfoList.getItems(camlQuery);
	clientContext.load(collListItem);
	var onQuerySucceeded=function(sender, args)
	{
		var oitem;
		var s='';
		var n=0;
		var len=collListItem.get_count();
		var results=[];
		while(n < len)
		{
			oitem = collListItem.itemAt(n);
			s+="Title:"+oitem.get_item("Title")+"<br></br>";
			n++;
		}
		$("#output").append(s);
	}
	var onQueryFailed=function(sender, args)
	{
		alert("Failed getting data.")
	}
	clientContext.executeQueryAsync
        (
        Function.createDelegate(this, onQuerySucceeded),
        Function.createDelegate(this, onQueryFailed)
        );
}

Output of Title column from a SharePoint 2010 list.

I love automating redundant tasks. One thing that bugs me when importing graphical assets to Flash's stage is having to resize the document to what I imported. I like that I can do this by going to the Document Properties and setting the document to match the content size, but if I have to do this each time I import/export content it becomes a irksome chore. I write JSFL scripts that run tasks on multiple files, having a "match contents" function would be useful to me in my case...maybe to you as well. I do not see a JSFL way to do this. (Maybe there is and I had a brain fart?). Until then, here is a script I wrote to do it in JSFL...

/*****************************************************************************************
What:	Document_to_Content_Size.jsfl
		JSFL Command for Flash (8+) that will resize the document to fit the content
		that is on the stage in the authoring environment.

Why:		Yep, this action can also be done by going to the Document Properties
		and setting "match" to "contents". However, I have not
		found a way to do this same action within JSFL script
		If you know a JSFL way to do this same action easier contact me.		

Date:		March 21, 2010
Author:	Keith Hair
Contact	khos2007@gmail.com
Web:		keith-hair.net		

INSTALL:
		If you deal with JSFL you probably know what to do, but anyway...
		Save this script with a ".jsfl" extension and put in:
		"Your Flash installation folder\en\First Run\Commands" folder
		Or just put it anywhere and double-click the file.

LEGAL STUFF:
		This script is free for whatever, just improve it or say hello! 		

NOTE:
		This is primarily for resizing the Flash
		document to fit content that is imported to the stage.
		Resizing is buggy with Component instances.

******************************************************************************************/
fl.outputPanel.clear();
runApp();
function runApp()
{
	var doc=fl.getDocumentDOM();
	var element;
	var docw=1;
	var doch=1;
	var fn=0;
	var ln=0;
	var en=0;
	var tframes;
	var layer;
	var frame;
	var ox;
	var oy;
	var left=null;
	var right=null;
	var top=null;
	var bottom=null;
	var cf=doc.getTimeline().currentFrame;
	while(ln < doc.getTimeline().layerCount)
	{
		layer=doc.getTimeline().layers[ln];
		tframes=layer.frameCount;
		fn=0;
		while(fn < tframes)
		{
			doc.getTimeline().currentFrame = fn;
			frame=layer.frames[fn];
			en=0;
			while(en < frame.elements.length)
			{
				element = frame.elements[en];
				ox=element.x;
				oy=element.y;
				if(left == null){
					left=ox;
				}
				if(right == null){
					right=ox+element.width;
				}
				if(top == null){
					top=oy;
				}
				if(bottom == null){
					bottom=oy+element.height;
				}

				left=Math.min(ox,left);
				right=Math.max(ox+element.width,right);
				top=Math.min(oy,top);
				bottom=Math.max(oy+element.height,bottom);
				en++;
			}
			fn++;
		}
		ln++;
	}
	fl.trace("CURRENT SIZE-->\t"+doc.width+" x "+doc.height);
	docw=Math.round(right-left);
	doch=Math.round(bottom-top);
	moveAllElementsBy(-left,-top);
	doc.width=docw;
	doc.height=doch;
	fl.trace("NEW SIZE-->\t\t\t"+doc.width+" x "+doc.height);
	doc.getTimeline().currentFrame=cf;
}

function moveAllElementsBy(tx,ty)
{
	doc=fl.getDocumentDOM();
	var element;
	var fn=0;
	var ln=0;
	var en=0;
	var tframes;
	var layer;
	var frame;
	var otp;
	while(ln < doc.getTimeline().layerCount)
	{
		layer=doc.getTimeline().layers[ln];
		tframes=layer.frameCount;
		fn=0;
		while(fn < tframes)
		{
			doc.getTimeline().currentFrame = fn;
			frame=layer.frames[fn];
			en=0;
			while(en < frame.elements.length)
			{
				element=frame.elements[en];
				element.x+=tx;
				element.y+=ty;
				if(element.elementType.search(/instance|text/mig) == -1){
					element.x+=element.width/2;
					element.y+=element.height/2;
				}

				en++;
			}
			fn++;
		}
		ln++;
	}

}

Here is a modification of the "findObjects" I posted earlier. This is handy if you are the type of person that names your symbol items with names you intend to use as their instance name as well.

Maybe you will find this useful or know improvements, either way let me know your thoughts.

 
/*========================================================================
selfNameAllInstances(true)
 
Renames all symbol instance names on the stage of in FLA document with
the symbol's library Name.
 
Instances that already have a name will be skipped...
If the argument "force_rename" is true, the element will be renamed
regardless if it already had a instance name or not.
 
The renaming process is recursive to each
for each MovieClip's timeline as well.
 
(Unfortunately symbols that are grouped are ignored.)
=========================================================================*/
 
function selfNameAllInstances (force_rename)
{
	fl.outputPanel.clear();
	var instanceName;
	var inInstance;
	var instances = [];
	var cnt=0;
	var findObjectInTimeline = function (instance, name)
	{
		var timeline;
		if (instance.toString () == "[object SymbolInstance]" || instance.toString () == "[object Frame]")
		{
			timeline = instance.timeline;
		}
		if (instance.toString () == "[object Document]")
		{
			timeline = instance;
		}
		if (instance.toString () == "[object Timeline]")
		{
			timeline = instance;
		}
		if (instance == fl.getDocumentDOM ())
		{
			timeline = instance.getTimeline ();
		}
		if (timeline == undefined)
		{
			return null;
		}
		var checked = new Object ();
		var currentLayers = timeline.layers;
		var layObj;
		var frm;
		var found;
		var i = 0;
 
		while (i < currentLayers.length)
		{
			var layObj = currentLayers [i];
			var frms = layObj.frames;
			var k = 0;
			while (k < frms.length)
			{
				var selArry = frms [k].elements;
				var n = 0;
				while (n < selArry.length)
				{
					var obj = selArry [n];
//=================================================================================
//IF THE OBJECT HAS A "name" PROPERTY, ASSIGN IT TO "found" VARIABLE.
//"found" VARIABLE will be returned from this recusive function.
//---------------------------------------------------------------------------------
					if (obj.name != "undefined")
					{
						found = obj;
						instances.push (obj);
					}
					if (obj.libraryItem != undefined)
					{
						if (obj.libraryItem.name != undefined)
						{
							if (checked [obj.libraryItem.name])
							{
								n ++;
								continue;
							}else
							{
								checked [obj.libraryItem.name] = true;
							}
//=================================================================================
//RENAME INSTANCE ON STAGE WITH IT'S LIBRARY NAME
//...also take of "slashes" in path.
//---------------------------------------------------------------------------------
var CHANGE_NAME=obj.libraryItem.name;
if(obj.name=="" || force_rename){
	CHANGE_NAME=CHANGE_NAME.substr(CHANGE_NAME.lastIndexOf("/")+1,CHANGE_NAME.length);
	obj.name=CHANGE_NAME;
	cnt++;
}
//=================================================================================
						}
						obj = findObjectInTimeline (obj.libraryItem, name);
						if (obj != null)
						{
							found = obj
						}
						obj = selArry [n];
						if (obj.libraryItem.timeline != undefined)
						{
							obj = findObjectInTimeline (obj.libraryItem.timeline, name);
							if (obj != null)
							{
								found = obj
							}
						}
					}
					n ++;
				}
				k ++;
			}
			i ++;
		}
		return found;
	}
	if (inInstance == null)
	{
		inInstance = fl.getDocumentDOM ();
	}
	findObjectInTimeline (inInstance, instanceName);
	alert("Renamed "+cnt+" symbols.");
}
 

Note: Unfortunately, this method will not find elements that are grouped.
Let me know if this is helpful or if there is a better way to do this.

Example:

 
fl.outputPanel.clear();
var items=findObjects("mybox");
var n=0;
while(n < items.length){
	items[n].rotation=45;
	n++;
}
alert("Found "+items.length+" items.");
 

 
/*-------------------------------------------------------------------
findObjects
 
Returns an Array of elements in FLA document that match instanceName.
If nothing matches instanceName, an Array with a length of 0 is returned.
--------------------------------------------------------------------*/
function findObjects (instanceName, inInstance)
{
	var instances = [];
	var groups = [];
	var findObjectInTimeline = function (instance, name)
	{
		var timeline;
		if (instance.toString () == "[object SymbolInstance]" || instance.toString () == "[object Frame]")
		{
			timeline = instance.timeline;
		}
		if (instance.toString () == "[object Document]")
		{
			timeline = instance;
		}
		if (instance.toString () == "[object Timeline]")
		{
			timeline = instance;
		}
		if (instance == fl.getDocumentDOM ())
		{
			timeline = instance.getTimeline ();
		}
		if (timeline == undefined)
		{
			return null;
		}
		var checked = new Object ();
		var currentLayers = timeline.layers;
		var layObj;
		var frm;
		var found;
		var i = 0;
 
		while (i < currentLayers.length)
		{
			var layObj = currentLayers [i];
			var frms = layObj.frames;
			var k = 0;
			while (k < frms.length)
			{
				var selArry = frms [k].elements;
				var n = 0;
				while (n < selArry.length)
				{
					var obj = selArry [n];
					if (obj.name == name)
					{
						found = obj;
						instances.push (obj);
					}
					if (obj.libraryItem != undefined)
					{
						if (obj.libraryItem.name != undefined)
						{
							if (checked [obj.libraryItem.name])
							{
								n ++;
								continue;
							}else
							{
								checked [obj.libraryItem.name] = true;
							}
						}
						obj = findObjectInTimeline (obj.libraryItem, name);
						if (obj != null)
						{
							found = obj
						}
						obj = selArry [n];
						if (obj.libraryItem.timeline != undefined)
						{
							obj = findObjectInTimeline (obj.libraryItem.timeline, name);
							if (obj != null)
							{
								found = obj
							}
						}
					}
					n ++;
				}
				k ++;
			}
			i ++;
		}
		return found;
	}
	if (inInstance == null)
	{
		inInstance = fl.getDocumentDOM ();
	}
	findObjectInTimeline (inInstance, instanceName);
	return instances;
}