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How could I add variables according to the length of the array?

I have an array that the values ​​range from A to Z, which I want to convert to variables that depend on the input data, for example:
enter the data
362,232,113 and this becomes an array of a length of 3 unit.
so I want to assign the name of a variable depending on the length of the input array but when executing the code, it assigns the array index well, but that same index executes the length of the input array and does not assign the variables as I would like it to.
in fact when executing this happens:
(3) 326
showing that the matrix was correctly divided but the same index was executed 3 times, in summary what I want is to be executed as follows:
"A = 326" "B = 232" "C = 113"
In advance I thank you for your help
var asignLetter = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","Z","X","Y","Z"];
matrix =[326,232,113];
function divide(){
xyz = matrix.split(",");
console.log(matrix);
for(var i = 0;i < xyz.length; i++){
window[assignLetter[i]] = xyz[i];
console.log(A); //(2) 326
}
}

You have a typo assignLetter instead of asignLetter ( two s ) and you need to pass a string to your function for it to work :
var assignLetter = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","Z","X","Y","Z"];
divide("326,232,113")// input data
function divide(matrix){
xyz = matrix.split(",");
for(var i = 0;i < xyz.length; i++){
window[assignLetter[i]] = xyz[i];
}
}
console.log({A,B,C});
You should avoid creating global variabels like that, have them in an object instead
var assignLetter = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","Z","X","Y","Z"];
var myVars = {};
divide("326,232,113")// input data
function divide(matrix){
xyz = matrix.split(",");
for(var i = 0;i < xyz.length; i++){
myVars[assignLetter[i]] = xyz[i];
}
}
console.log(myVars);

I think you want to pass the parameters 326,232,113 as a whole string. You're passing them as parameters wrong.
So just do the same thing you're doing but like this: divide("326,232,113")

access variable from outside loop

I know that this is fundamental JS, but I'd like a simple explanation. From what I've read, If i declare an empty variable outside of my loop, the variable inside the loop should be accessible globally? Or am I totally wrong?
I would like to access randAd from outside my for loop.
var mobileAds = [
"mobile/bb.jpg",
"mobile/eyeko.jpg",
"mobile/farfetch.jpg",
"mobile/fsb.jpg"
];
var randNum = (Math.floor(Math.random() * mobileAds.length));
var randAd;
var i;
for (i = 0; i < mobileAds.length; ++i) {
randAd = (mobileAds[randNum]);
}

If you want to access every element of randAd outside the for loop try like this var randAd = []; to initialize it as an array. You can easily access it after your for loop but If you use it as a simple variable var randAd;then you'll get the last variable always (it overwrites). So initialize it as an array and push every element inside loop before outputting it.
var mobileAds = [
"mobile/bb.jpg",
"mobile/eyeko.jpg",
"mobile/farfetch.jpg",
"mobile/fsb.jpg"
];
var randNum = (Math.floor(Math.random() * mobileAds.length));
var randAd = []; // see the change here
var i;
for (i = 0; i < mobileAds.length; ++i) {
randAd.push(mobileAds[randNum]); // push every element here
}
console.log(randAd);

You are overthinking. You have done the hard bit in getting a random number between 0 and array's length. So, just get the ad at that index:
var randAd = mobileAds[randNum];
No need to use for loop at all.

If you would like to use randAd it should be initialised as an empty array [] and then push in that array from inside your loop randAd.push(). Like this:
var randAd=[];
var i;
for (i = 0; i < mobileAds.length; ++i) {
randAd.push(mobileAds[randNum]);
}

Google scripts. TypeError: Cannot call method "replace" of undefined

First post please go easy on me.
I have an array that looks something like this [BTC-LTC, BTC-DOGE, BTC-VTC] I am trying to change all the "-" with "_". But am having trouble with using the .replace() method. Here is my code.
var array = [BTC-LTC, BTC-DOGE, BTC-VTC];
var fixedArray = [];
for(var i=0; i <= array.length; i++){
var str = JSON.stringify(array[i]);
var res = str.replace("-","_");
fixedArray.push(res);
};
I tried without using the JSON.stringify but that didn't work either. I have also tried to first create var str = String(); this also did not work. Is it possible that the method .replace() is not available in google scripts?

In your example var array = [BTC-LTC, BTC-DOGE, BTC-VTC];
should be
var array = ["BTC-LTC", "BTC-DOGE", "BTC-VTC"];
However I gather from the comments that this is just a typo in your initial example.
var str = JSON.stringify(array[i]); is redundant. You can just do var str = array[i]; Since the value in the array is already a string, there's no need to turn it into one again - the "stringify" method expects to be given an object or array to work on.
However the main problem is that your for loop goes on one too many iterations. Arrays are zero-based, so you need to stop looping when the index is 1 less than the length of the array, not equal to it. e.g. if array.length is 10 then there are 10 indices, but they start at 0, so the indices are 0,1,2,3,4,5,6,7,8,9. If your loop goes on to equal to array.length, then on the last loop array[10] will be out of bounds, and it's only this last iteration which is giving you the undefined error.
var array = ["BTC-LTC", "BTC-DOGE", "BTC-VTC"];
var fixedArray = [];
for (var i = 0; i < array.length; i++) {
var str = array[i];
var res = str.replace("-","_");
fixedArray.push(res);
}

If I understood correctly, you're trying to edit strings, not variables, so you need quotes in your array, and a g in your replace in case you have multiple things to replace :
var array = ['BTC-LTC', 'BTC-DOGE', 'BTC-VTC'];
var fixedArray = [];
for(var i=0; i <= array.length; i++){
fixedArray.push(array[i].replace(/-/g, '_'));
};

code is working fine if we change as below:
var array = ['BTC-LTC', 'BTC-DOGE', 'BTC-VTC'];

cannot iterate through array and change value in JS

I have to iterate through an array, change one of its values, and create another array refelecting the changes.
this is what I have so far:
JS:
var arr = new Array();
arr['t1'] = "sdfsdf";
arr['t2'] = "sdfsdf";
arr['t3'] = "sdfsdf";
arr['t4'] = "sdfsdf";
arr['t5'] = "sdfsdf";
var last = new Array();
for (var i = 0; i <= 5; i++) {
arr['t2'] = i;
last.push(arr);
}
console.log(last);
Unfortunately, these are my results
As you can see, I am not getting the results needed as 0,1,2.. instead I am getting 2, 2, 2..
This is what i would like my results to be:
How can I fix this?

You have to make a copy, otherwise you are dealing with reference to the same object all the time. As it was said before - javascript does not have associate arrays, only objects with properties.
var arr = {}; // empty object
arr['t1'] = "sdfsdf";
arr['t2'] = "sdfsdf";
arr['t3'] = "sdfsdf";
arr['t4'] = "sdfsdf";
arr['t5'] = "sdfsdf";
var last = new Array();
for (var i = 0; i <= 5; i++) {
var copy = JSON.parse(JSON.stringify(arr)); //create a copy, one of the ways
copy['t2'] = i; // set value of its element
last.push(copy); // push copy into last
}
console.log(last);
ps: you can use dot notation arr.t1 instead of arr['t1']

The array access with ['t2'] is not the problem. This is a regular JavaScript feature.
The problem is: You are adding the SAME array to "last" (5 times in code, 3 times in the screenshot).
Every time you set ['t2'] = i, you will change the values in "last" also, because they are actually just references to the same array-instance.
You must create a copy/clone of the array before you add it to "last".
This is what will happen in all languages where arrays are references to objects (Java, C#...). It would work with C++ STL though.

A good way to associate a counter to each member of an array in Javascript?

I have an array of strings in Javascript like `var elements = ["string1", "string2"]; The array is created dynamically so it could contain any number of strings. I want to associate a counter to each element of the array. The counter will increment or decrement during the webpage's life.
I was going to try element["string1"].counter = 1; but it didn't work.
What's a good way to implement this?

If you had an array var elements = ["string1", "string2"], you could not access an element with elements["string1"], you are using the value not the index. elements[0] is the correct form of access to the element, using the numerical key.
Even then, strings are special types of object and do not appear to take additional parameters readily, at least not when I tested a moment ago. Which is odd.
You could quickly knock the array in to a set of objects with separate text and counter components.
var elements = ["string1", "string2"];
var elementsWithCounter = [];
for(var index = 0; index < elements.length; index++) {
elementsWithCounter[i] = { text: elements[index], counter: 1 };
}

You could also create a "hash table" using a plain object such as:
var counter = {};
for(var i = elements.length; i--; ) {
counter[elements[i]] = 1;
}
Then you could increment the counter with:
counter['string1'] += 1;
or
counter[elements[0]] += 1;

This might help you.
elementArray = ["string1", "string2"]
function setCounter(str, val) {
for (var i = 0; i < elementArray.length; i++) {
if (str === elementArray[i]) elementArray[i].counter = val;
}
}
function getCounter(str) {
for (var i = 0; i < elementArray.length; i++) {
if (str === elementArray[i]) return elementArray[i].counter;
}
}
setCounter("string1", 5);
getCounter("string1");
Alternatively just access elementArray[index].counter

Javascript primitives/built in objects can't have properties/attributes added to their prototype (i.e. String.prototype.counter = -1 doesn't work correctly). Image, String, Date, Array all can't have properties added.
Maybe instead of a string you should make it an object, similar to what Orbling has posted.