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How do I put together string variables in Javascript? It's just saying "Object Undefined"

I have tried for so long to get this code to work. I'm programming a little game when you need to be fast, so I made a stopwatch. But the stopwatch just doesn't want to work. Instead of the seconds the stopwatch is showing Object Undefined and I don't know why. This is the code i'm using:
var stopwatchFrame = 0;
var stopwatchSeconds = 0;
var stopwatchSecondsString = "Nothing";
stopwatchFrame+=1;
stopwatchSeconds = floor(stopwatchFrame/updatesPerSecond);
stopwatchSecondsString = toString(stopwatchSeconds);
var = "Total time: " + stopwatchSecondsString + " seconds";
I'm using a simple website called Koda.nu, it's a Swedish website for young to learn programming in JS. Some functions is coming from their built in source. I'm new to programming so that's why.

You are missing a variable name where you have a value of "Total time: " + stopwatchSecondsString + " seconds"; It should be:
var totalTime = "Total time: " + stopwatchSecondsString + " seconds";
Also read what #Jaromanda X wrote in the comments section. It should be like this:
stopwatchSeconds = Math.floor(stopwatchFrame/updatesPerSecond);
stopwatchSecondsString = stopwatchSeconds.toString();
We don't have an access to your updatesPerSecond variable so that would throw an error as well. If declared, your code would work like this:
var stopwatchFrame = 0;
var stopwatchSeconds = 0;
var stopwatchSecondsString = "Nothing";
var updatesPerSecond = 0;
stopwatchFrame += 1;
stopwatchSeconds = Math.floor(stopwatchFrame / updatesPerSecond);
stopwatchSecondsString = stopwatchSeconds.toString();
var totalTime = "Total time: " + stopwatchSecondsString + " seconds";

You dont have a variable name in the last line, and if this is all your code, then you dont initialize updatesPerSecond, meaning you dont have a line like
var updatesPerSecond = somenumberhere
If you name your last variable and initialize updatesPerSecond then you should be fine.
However I dont know anything about this website, but I quess it's old. Here is some advice.
You need to tell javascript, that floor is a function from Math so use Math.floor, maybe it works in this website like you did, but keep in mind that you should use it otherwise.
toString() doesnt work like that. Again I dont know if they are using some different methods, but normal js toString() works like number.toString() and u can pass the radix as a parameter, meaning the base of the number representation (2 for binary, 16 for hexadecimal etc.) but this is optional, default is 10 for decimal.
Dont use var as a declaration. Use let instead, if the variable will change, and use const if it wont. In your case you should use let everywhere.
Other thing is that you can use the ++ operator to increment a value by 1, so instead of stopwatchFrame+= 1 just use stopwatchFrame++
And last you shouldn't initialize your default string value as "Nothing", it should be "", an empty string or undefined or null.
I hope this helps, have a good day!

Make javascript as function

i could not make it as function.Please help.When i modified as function and add button,it not work.
i'm newbie in javascript.i would like study by the simple script.But for the below script when i try to add "function xxx()" it not working with input button.
I try to solve by my own with google...failed.
<script>
var myStr = "xxx yyy zzz";
var strArray = myStr.split(" ");
// Display array values on page
for(var i = 0; i < strArray.length; i++){
document.write("<p>" + strArray[i] + "</p>");
}
</script>

Break your code into blocks if you ever are stuck on something. So first you are trying to break a string into an array so that's your first block. Then your second block would be to write it to the page. So we have our code basically written out in our heads.
---Break string
---Display broken string
So to make a function we need to write a function first
myFunction = function(){
};
But to get the function to be modular we need to be able to pass in variables
So we'll add two variables one being the string to pass through and one being the location to inject the looped broken text.
myFunction = function(str, location){
};
Now we have to do something with these variables.
myFunction = function(str, location){
///test if str is a string
if(typeof(str) == "string")
{
var l = str.split(" "); /// here we're spliting the string into an array by every space
if(l.length >= 1) ///test if there's atleast one item
for(i=0;i<l.length;i++) ///simple for loop
location.innerHTML += "This is a part of str " + l[i] + "<br>" ///you can do anything here you want to do.
}
};
Now as you can see it's modular at it's lowest point, this can be as complex as you want it. here is a test you can try out and mess around with. https://jsfiddle.net/s8pytzm3/1/

Running script function from editor doesn't work as expected

So, I never ever programmed JavaScript and never did anything with Google Script before either. I have a fairly good understanding of Visual Basic and macros in Excel and Word. Trying to make a fairly basic program: Plow through a list of variables in a spreadsheet, make a new sheet for each value, insert a formula in this new sheet, cell (1,1).
Debug accepts my program, no issues - however, nothing at all is happening when I run the program:
function kraft() {
var rightHere =
SpreadsheetApp.getActiveSpreadsheet().getActiveSheet().getRange("A1:A131");
var loopy;
var goshDarn = "";
for (loopy = 1; loopy < 132; loopy++) {
celly = rightHere.getCell(loopy,1);
vaerdi = celly.getValue();
fed = celly.getTextStyle();
console.log(vaerdi & " - " & fed);
if (vaerdi != "" && fed.isBold == false) {
SpreadsheetApp.getActiveSpreadsheet().insertSheet(vaerdi);
var thisOne = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(vaerdi);
thisOne.deleteRows(500,500);
thisOne.deleteColumns(5, 23);
thisOne.getRange(1,1).setFormula("=ArrayFormula(FILTER('Individuelle varer'!A16:D30015,'Individuelle varer'!A16:A30015=" & Char(34) & vaerdi & Char(34) & ")))");
}
}
}
activeSheet could be called by name, so could activeSpreadsheet, I guess. But range A1:A131 has a ton of variables - some times there are empty lines and new headers (new headers are bold). But basically I want around 120 new sheets to appear in my spreadsheet, named like the lines here. But nothing happens. I tried to throw in a log thingy, but I cannot read those values anywhere.
I must be missing the most total basic thing of how to get script connected to a spreadsheet, I assume...
EDIT: I have tried to update code according to tips from here and other places, and it still does a wonderful nothing, but now looks like this:
function kraft() {
var rightHere = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet().getRange("A1:A131");
var loopy;
var goshDarn = "";
for (loopy = 1; loopy < 132; loopy++) {
celly = rightHere.getCell(loopy,1);
vaerdi = celly.getValue();
fed = celly.getFontWeight();
console.log(vaerdi & " - " & fed);
if (vaerdi != "" && fed.isBold == false) {
SpreadsheetApp.getActiveSpreadsheet().insertSheet(vaerdi);
var thisOne = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(vaerdi);
thisOne.deleteRows(500,500);
thisOne.deleteColumns(5, 23);
thisOne.getRange(1,1).setFormula("=ArrayFormula(FILTER('Individuelle varer'!A16:D30015,'Individuelle varer'!A16:A30015=" + "\"" + vaerdi + "\"" + ")))");
}
}
}
EDIT2: Thanks to exactly the advice I needed, the problem is now solved, with this code:
function kraft() {
var rightHere = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet().getRange("A1:A131");
var loopy;
for (loopy = 1; loopy < 132; loopy++) {
celly = rightHere.getCell(loopy,1);
vaerdi = celly.getValue();
fed = celly.getFontWeight()
console.log(vaerdi & " - " & fed);
if (vaerdi != "" && fed != "bold") {
SpreadsheetApp.getActiveSpreadsheet().insertSheet(vaerdi);
var thisOne = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(vaerdi);
thisOne.deleteRows(500,499);
thisOne.deleteColumns(5, 20);
thisOne.getRange(1,1).setFormula("=ArrayFormula(FILTER('Individuelle varer'!A16:D30015;'Individuelle varer'!A16:A30015=" + "\"" + vaerdi + "\"" + "))");
}
}
}

There are multiple issues with your script, but the main one is that you never actually call the isBold() function in your 'if' statement.
if (value && format.isBold() == false) {
//do something
}
Because you omitted the parentheses in 'fed.isBold', the expression never evaluates to 'true'. 'isBold' (without the parentheses) is of type Object as it's a function.
There are other issues that prevent the script from running properly:
Not using the 'var' keyword to declare variables and polluting the global scope. As a result, all variables you declare within your 'for' loop are not private to your function. Instead, they are attached to the global object and are accessible outside the function. https://prntscr.com/kjd8s5
Not using the built-in debugger. Running the function is not debugging. You should set the breakpoints and click the debug button to execute your function step-by-step and examine all values as it's being executed.
Deleting the non-existent columns. When you create the new sheet, you call the deleteColums(). There are 26 columns in total. The 1st parameter is the starting column while the 2nd one specifies how many columns must be deleted. Starting from column 5 and telling the script to remove 23 columns will throw an exception. Always refer to the documentation to avoid such errors.
console.log doesn't exist within the context of the Script Editor. You are NOT executing the scripts inside your browser, so Browser object model is not available. Use Logger.log(). Again, this is detailed in the documentation.
Your formula is not formatted properly.
JS is a dynamically typed language that's not easy to get used to. If you don't do at least some research prior to writing code, you'll be in for a lot of pain.

Incrementing Number Inside String

For a client's requirement, I have set out several images as follows:
img/img1.jpg
img/img2.jpg
img/img3.jpg
...
img/img4.jpg.
Now, I need to make the function that loads images dynamic. At the moment, the current solution is as follows:
// Grab the last image path
var lastImagePath = $("lastImage").attr("src");
// Increment the value.
var nextImagePath = "img/img" + (+lastImagePath.replace("img/img").replace(".jpg") + 1) + ".jpg";
// So on.
I was wondering if there's a cleaner way to increment the number?

Slightly cleaner:
var nextImagePath = lastImagePath.replace(/\d+/, function (n) { return ++n; });
This uses the version of replace that accepts a regular expression and a function.

document.getElementById doesn’t work

If I write code 2 without code 1, the code works and it shows me “aaaaa”.
But if I write code 1 and code 2, the code doesn’t work. Instead of showing me “vvvaa”, it doesn’t show me anything (not “aaaaa” and not “vvvaa”).
Why doesn’t it work? (The document.getElementById doesn’t send the information to the <div>.)
Code 1:
document.getElementById('na').innerHTML = "vvvaa";
Code 2:
document.write("<div id='na'> aaaaa </div>");
Complete Code: (the only thing on the page)
<script>
function timeago(time) {
var new_date = new Date();
var time_ago = Math.floor(new_date.getTime()/1000-time);
var d = Math.floor(time_ago/24/60/60);
var h = Math.floor((time_ago-d*24/60/60)/60/60);
var m = Math.floor((time_ago-d*24/60/60-h*60/60)/60);
var s = Math.floor(time_ago-d*24/60/60-h*60/60-m*60);
document.write(d+"d - "+h+"h - "+m+"m - "+s+"s");
document.getElementById('na').innerHTML="vvvaa";
// setTimeout( function(){ timeago(time); }, 2000 );
}
timeago('1376743609');
document.write("<div id='na'> aaaaa </div>");
</script>

Order matters. You cannot access your element 'na' before having it in the document.
You naturally need to add the element to the document first. If that's done, you can access it by functions like getElementById().
This...
document.write("<div id='na'></div>");
document.getElementById('na').innerHTML = "vvvaa";
... will work.
You may shortcut this to:
document.write("<div id='na'>vvvaa</div>");

I am assuming your console says that document.getElementById('na') is undefined and innerHTML is not a method of undefined. This is caused by the fact that there is no such element when the code is called. A fatal error will stop any further javascript execution, in this case your document.write.
Add the element to your document first before trying to access it via document.getElementById

You can't access a piece of text unless it really does exist. In your case, you are trying to access the text when it doesn't even exist at that point. The order matters. Code 2 should go first and Code 1 should go last. First write the text, then access it.

The document.write only be passed after timeago() therefore does not exist over the <div>, so just call "timerago" after using document.write Try:
<script>
function timeago(time) {
var new_date = new Date();
var time_ago = Math.floor(new_date.getTime()/1000-time);
var d = Math.floor(time_ago/24/60/60);
var h = Math.floor((time_ago-d*24/60/60)/60/60);
var m = Math.floor((time_ago-d*24/60/60-h*60/60)/60);
var s = Math.floor(time_ago-d*24/60/60-h*60/60-m*60);
document.write(d+"d - "+h+"h - "+m+"m - "+s+"s");
document.getElementById('na').innerHTML="vvvaa";
// setTimeout( function(){ timeago(time); }, 2000 );
}
document.write("<div id='na'> aaaaa </div>");
timeago('1376743609');
</script>