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console gives a string isn't a function error

I'm creating a quiz and console shows a problem with split, that it's not a function, but it worked before. I've tried using toString method but it doesn't help, console says instead that can't read properties of null. If someone could help me, it would be appreciated.
let correctAnswer = document.getElementById("correct-answers");
document.querySelector(".check").onclick = function () {
/* Hide unneeded sections and showing scores */
quiz.classList.add("hidden");
correctAnswer.classList.remove("hidden");
/*Showing all previous scores */
const lastScore = localStorage.getItem("latestScore") || [];
const scoreDetail = lastScore.split(',');
scoreDetail.push(score);
localStorage.setItem("latestScore", scoreDetail);
let userScoreTemplate = `<h2>This Round's Score: ${score}</h2>`;
scoreDetail.map((items, index) => {
userScoreTemplate += `<h3>Score ${index}: ${items}</h3>`
});
let userScoreBoard = document.getElementById("user-score");
userScoreBoard.innerHTML = userScoreTemplate;

localStorage.getItem() will return a string.
You need adjust your code accordingly to default to a string in case the item is not defined:
const lastScore = localStorage.getItem("latestScore") || "";

In your code lastScore is an array, not a string, so the split method will not work on it. It works only on strings.You can use JSON.Parse like that. This will convert array data into javascript array.
const scoreDetail = JSON.parse(lastScore) || [];
scoreDetail.push(score);
And after that convert the array into a JSON string :
localStorage.setItem("latestScore", JSON.stringify(scoreDetail));

is latest score is a obj/array/string or what?
If it's an array/object then wrap localStorage.getItem in JSON.parse() so js can convert array data into js array

As per the error, You are trying to apply split on an array instead of a string.
Looks like, localStorage.getItem("latestScore") is undefined while you are trying to access it and it assigned an empty array to lastScore variable.
Hence, Instead of
const lastScore = localStorage.getItem("latestScore") || [];
Use
const lastScore = localStorage.getItem("latestScore") || "";

Setting Values in Google Apps Script

I'm trying to set values using the following logic:
function compare(){
var values = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet().getDataRange().getValues();
for(n=0;n<values.length;++n){
var cell = values[n][0] ;
values[n][0].setValue("myValue");
}
}
But I can't set the value this way. I'm trying to use the cell[n][x] notation because its easier for what I have to do later on.
Thanks in advance for your help.

You can't use .setValues() because values[n][0] is not an object, it is just the value of a 2D-array. Just use values[n][0] = "my Value". At the end you will have editted your array, then you'll need to use range.setValues() to set the new values to your range.
Example:
function compare(){
var myRange = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet().getDataRange();
var values = myRange.getValues();
for(var n=0;n<values.length;n++){
values[n][0]="myValue "+n;
values[n][1]="myValue 2 "+n;
}
myRange.setValues(values)
}

How to return a line from an array by searching for a specific value in said line

good evening, I am trying to use a single value to search an array, and return the full line the said value is in.
The Array is set up like this in string form:
Xanax,Brand,Anxiety,Code
However, now I'm stuck with calling back only the Medication, and not the full line the Medication is in, sadly. I would like to be able to grab each variable in a line, and make them their own independent variables outside of the array so I can use them for something else.
this.importDataObject("MEDDIAGNOSISICD-10.txt", "C:/Users/dell/Documents/tab
excel/MEDDIAGNOSISICD-10.txt");
var oFile = this.getDataObjectContents("MEDDIAGNOSISICD-10.txt");
var cFile = util.stringFromStream(oFile, "utf-8");
var fileArray = cFile.split('\t');
var Med = this.getField("Medications 1");
var Index = fileArray.indexOf(Med.value);
var Call = fileArray[Index];
console.println(Call);
Any help would be wonderful!

It's because you are running the indexOf method on the whole array, you need to run it on the each value instead. Try a for loop before you check IndexOf method.
Like this:
var i, Index;
for (i = 0; i < fileArray.length; i++) {
Index = fileArray[i].indexOf(Med.value);
if(Index > -1) console.log('Your search is found in ' + fileArray[i] );
}
Note that, in here the variable Index will be 0 or larger if that search is successful. And will be of value -1 if no match is found.

Using array returned by String.split

data = 'numbersXXXtext';
or
data = 'XXXtext';
var get = data.split('XXX');
var sum = get[1];
I would like get always "text". If data equals numbersXXXtext, the code works fine, but if data is XXXtext then get[1] is undefinded.
Does anyone know how I can solve this?

If there is only one occurrence of XXX in the string, the bit you want will always be the last item in the array returned by split. You can use pop to get the last item of an array:
var a = "numbersXXXtext";
var b = "XXXtext";
console.log(a.split('XXX').pop()); // "text"
console.log(b.split('XXX').pop()); // "text"

Try this:
var sum = get.length > 1 ? get[1] : get[0]

Strange, i just tried your code, and it's working. (http://writecodeonline.com/javascript/)
Are you sure you are not missing something?
data = 'numbersXXXtext';
//data = 'XXXtext';
var get = data.split('XXX');
document.write(get[1]);
document.write("</br>");
document.write(get);
document.write("</br>");
I didn't get undefined in neither of your strings

An alternative using substring:
var data = 'numbersXXXtext';
var value = data.substring(data.indexOf('XXX') + 'XXX'.length);

Global var in JavaScript

This is annoying me.
I'm setting an array in beginning of the doc:
var idPartner;
var myar = new Array();
myar[0] = "http://example.com/"+idPartner;
And I'm getting a number over the address, which is the id of partner. Great. But I'm trying to set it without success:
$.address.change(function(event) {
idPartner = 3;
alert(idPartner);
}
Ok. The alert is giving me the right number, but isn't setting it.
What's wrong?

Changing the value of the variable does not re-set the values within the array. That is just something javascript can't do automatically. You would have to re-generate the array for it to have the new id. Could you add the id to the value where you use the array instead of pre-setting the values in the array containing the id?
Edit: For example, you would do:
var myArray = [];
var myId = 0;
myArray[0] = "http://foo.com/id/";
and when you need to use a value from the array, you would do this:
var theVal = myArray[0] + myId;

Try this:
var myvar = ["http://site.com/"];
$.address.change(function(event) {
myvar[1] = 3;
}
then use myvar.join () where you need the full url.

The problem here is that at the line
myar[0] = "http://site.com/"+idPartner;
..you perform a string concatenation, meaning you copy the resulting string into the array at index position 0.
Hence, when later setting idPartnerit won't have any effect on the previously copied string. To avoid such effect you can either always construct the string again when the idPartnervariable updates or you create an object and you evaluate it when you need it like...
var MyObject = function(){
this.idPartner = 0; //default value
};
MyObject.prototype.getUrl = function(){
return "http://site.com/" + this.idPartner;
};
In this way you could use it like
var myGlblUrlObj = new MyObject();
$.address.change(function(event){
myGlblUrlObj.idPartner = ... /setting it here
});
at some later point you can then always get the correct url using
myGlblUrlObj.getUrl();
Now obviously it depends on the complexity of your situation. Maybe the suggested array solution might work as well, although I prefer having it encapsulated somewhere in an object for better reusability.

myar[0] = "http://site.com/" + idPartner;
After this line, myar[0] = "http://site.com/undefined" and it has nothing to do with the variable idPartner no more.
So, after that changing the value of idPartner will affect the value of myar[0].
You need to change the value of myar[0] itself.