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Adding values concatenating

Instead of "var instance = ..." adding the two values it concatenates them. Can anyone suggest what I need to fix?
I'm trying to add "var startingEmail" value and "var k".
Thank you for your help!
var startingEmail = sheet.getRange("C2").getDisplayValue();
var numEmails = sheet.getRange("E2").getDisplayValue();
var max = numEmails;
for (var k = 0; k<max; ++k){
var threads = GmailApp.getInboxThreads(startingEmail,max)[k]; //get max 50 threads starting at most recent thread
var messages = threads.getMessages()[0];
var sndr;
var rcpnt;
var srAry = [];
var sndr = messages.getFrom().replace(/^.+<([^>]+)>$/, "$1"); //http://stackoverflow.com/questions/26242591/is-there-a-way-to-get-the-specific-email-address-from-a-gmail-message-object-in
var sndrLower = sndr.toLowerCase;
var rcpnt = messages.getTo().replace(/^.+<([^>]+)>$/, "$1");
var rcpntLower = rcpnt.toLowerCase;
var cc = messages.getCc().replace(/^.+<([^>]+)>$/, "$1");
var ccLower = cc.toLowerCase;
//srAry.push(sndr);
//srAry.push(rcpnt);
//srAry.push(cc);
var isIn = joinAddr.search(sndr || rcpnt);
if(isIn == -1){
var instance = k;

I can't see the example in your code but it sounds like you can just wrap Number() around your variable and it will perform the type conversion so the code will perform the math instead of concatenating as strings.

Separate string into multiple variables with JavaScript

Using JavaScript I want to take a string like this var hashStr = 'modal-123456' and assign the string left of the - to a variable and the string right of the - to another variable.
If the string does not contain a - then ignore it.
How can I best achieve this?
var hashStr = location.hash.replace('#', '');
// hashStr now === 'modal-123456'
var firstHalf = // modal
var secondHalf = // '123456'

You can use split API.
var hashStr = 'modal-123456'
var splitStr = hashStr.split('-');
console.log(splitStr[0])
console.log(splitStr[1])

Just use split.
var hashStr = 'modal-123456';
var [firstHalf, secondHalf] = hashStr.split("-");
console.log("first half:", firstHalf);
console.log("second half:", secondHalf);

Simply
var hashStr = location.hash.replace('#', '');
var firstHalf = hashStr.split("-")[0];
var secondHalf = hashStr.split("-")[1];
or
var hashStr = location.hash.replace('#', '').split("-");
var firstHalf = hashStr[0];
var secondHalf = hashStr[1];

Extracting specific information from an array

I have data two sets of data as follows:
"One.Two.Three.Four"
"One.Two.Three.1.Four"
The first three parts are fixed and the remaining can extend to as many as possible.
I am trying to build an object where I want to split and combine whatever is present after three into an object.
var split = samplestr.split('.');
var finalarray = [];
if(split.length>4)
{
finalarray[0] = split[0];
finalarray[1] = split[1];
finalarray[2] = split[2];
finalarray[3] = split[3]+"."split[4];
}
I need to generalise this such that even if the string is of the form
"One.Two.Three.1.2.3.Four"
finalarray[3] = 1.2.3.Four;
Any hints on generalising this?

With Array#shift and Array#join.
var split = samplestr.split('.');
var finalarray = [];
if(split.length > 4) {
finalarray[0] = split.shift();
finalarray[1] = split.shift();
finalarray[2] = split.shift();
finalarray[3] = split.join(".");
}

simply replace
finalarray[3] = split[3]+"."split[4];
with
finalarray[3] = split.slice(3).join(".");

Split the string, slice the first part and append the join'ed second part:
console.info=function(x){document.write('<pre>'+JSON.stringify(x,0,3)+'</pre>')}
//--
var str = "One.Two.Three.Four.More.Stuff";
var s = str.split('.');
var result = s.slice(0, 3).concat(s.slice(3).join('.'));
console.info(result);

Get values from string using jquery or javascript

I have string like this:-
var src=url("http://localhost:200/assets/images/eyecatcher/6/black6.png)"
And now I want to get image name i.e black6.png and folder name 6.
I know there is substr function I can use but the file name and folder name will be dynamic like
orange12.png and 12 etc.
How I can get these values? Please help me.
Thanks

You can use split method for this:
var src = "http://localhost:200/assets/images/eyecatcher/6/black6.png";
var parsed = src.split( '/' );
console.log( parsed[ parsed.length - 1 ] ); // black6.png
console.log( parsed[ parsed.length - 2 ] ); // 6
console.log( parsed[ parsed.length - 3 ] ); // eyecatcher
etc.

If the base URL is always the same you could do
var url = "http://localhost:200/assets/images/eyecatcher/6/black6.png";
var bits = url.replace("http://localhost:200/assets/images/eyecatcher/", "").split("/");
var folder = bits[0], // 6
file = bits[1]; // black6.png

If your string is:
var src="http://localhost:200/assets/images/eyecatcher/6/black6.png"
Use the following:
var parts = src.split('/');
var img = parts.pop(); //black6.png
var flder = parts.pop(); //6
var sflder = parts.pop(); //eveatcher

You may try like this:
var str = myString.split('/');
var answer = str[str.length - 1];
var answer1 = str[str.length - 2];
var answer2 = str[str.length - 3];

var img_name = src.split('/')[7];
var folder_name = src.split('/')[6];

Using split & slice, Say like bellow
var src = "http://localhost:200/assets/images/eyecatcher/6/black6.png";
var arr = src.split('/').slice(-2) //returns ["6", "black6.png"]
arr[0] //folderName
arr[1] //filename

var str = "http://MachineName:200/assets/images/eyecatcher/6/black6.png";
var newStr = str.split("/");
ubound = newStr.length;
fileName = newStr[ubound-1];

Regex to get last word in URL between / and /

How do I get the last word in a URL that is URL between / and / ?
For example:
http://mywebsite.com/extractMe/test
http://mywebsite.com/extractMe
http://mywebsite.com/settings/extractMe/test
http://mywebsite.com/settings/extractMe
Here I would want to get extractMe from the URL.

If the URL is consistent, why not just use:
// Option 1
var url = "http://mywebsite.com/extractMe/test";
var extractedText = url.split("/")[3];
​// Option 2
// If when a trailing slash is present you want to return "test", use this code
var url = "http://mywebsite.com/extractMe/test/";
var urlAry = url.split("/");
var extractedText = urlAry[urlAry.length - 2];
​// Option 3
// If when a trailing slash is present you want to return "extractMe", use this:
var url = "http://mywebsite.com/extractMe/test/";
var urlAry = url.split("/");
var positionModifier = (url.charAt(url.length-1) == "/") ? 3 : 2;
var extractedText = urlAry[urlAry.length - positionModifier];
Here's a working fiddle: http://jsfiddle.net/JamesHill/Arj9B/

it works with / or without it in the end :)
var url = "http://mywebsite.com/extractMe/test/";
var m = url.match(/\/([^\/]+)[\/]?$/);
console.log(m[1]);
output:
test

This accounts BOTH for URLS like http://mywebsite.com/extractMe/test and http://mywebsite.com/extractMe/
function processUrl(url)
{
var tk = url.split('/');
var n = tk.length;
return tk[n-2];
}
Edited.

Regular Expression way:
var str = "http://example.com/extractMe/test";
var match = str.match(/\/([^\/]+)\/[^\/]+$/);
if (match) {
console.log(match[1]);
}