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Creating an multidimensional array of array objects

I have a multidimensional array created by taking data from a google spreadsheet. I am attempting to seperate out the data based on results in a specific column. For example:
var j = {
["Mine", "House"],
["Your", "House"],
["his", "apt"]
}
Given that we want to seperate by column 2. We should get in theory:
var new = {
[["Mine", "House"] , ["Your", "House"]],
[["his", "apt"]]
}
Two entries being a house, and 1 being an apartment. I am haveing a huge issue with treating each entry as its own obj. Assuming it is even possible. I guess we would access specific parts of each object like so, new[0][1][1]? This obviously shouldnt work like this. Is there another way to seperate the entries in the way I am attempting? As it stands right now, I believe my code is just creating the same number of rows as in the original data.
var spreadsheet = SpreadsheetApp.getActive();
spreadsheet.insertSheet("Report");
var data_sheet =spreadsheet.getSheetByName("Data");
var genCounsel_data = data_sheet.getRange(240, 1, 96, 7).getValues(); //get genCounseling data
var report_sheet = spreadsheet.getSheetByName("Report");
//setup key values for columns in report sheet
report_sheet.appendRow(["Student Service", "Unit Student Service Outcome", "Indicators Data Sources", "How indicator was measured", "Benchmark Data", "Assigned to do Assessment", "Email"])
//seperate out by SS outcomes
var genCounselDataByOutcomes = new Array(new Array()); //all responses for each outcome, also parrellel
var outcomes_freq = new Array(); //parrellel arrays
var found = false;
//get services and frequency;
for(var i=0; i<genCounsel_data.length; ++i){
genCounsel_data[i][OUTCOMES_COL].toString().toLowerCase();
for(var j=0; j<genCounselDataByOutcomes.length && !found; ++j){
if(genCounselDataByOutcomes[j][OUTCOMES_COL] == genCounsel_data[i][OUTCOMES_COL]){
genCounselDataByOutcomes[j].push(genCounsel_data[i]); //ADD to row with same outcomes
++outcomes_freq[j]; //update amount of entries in said outcome
found = true;
}
}
if(found == false){
genCounselDataByOutcomes.push(new Array);
genCounselDataByOutcomes[genCounselDataByOutcomes.length-1].push([genCounsel_data[i]]);
outcomes_freq.push(1);
}
else
found = false;
}
for(var i=0; i<outcomes_freq.length;++i)
Logger.log(outcomes_freq[i]);
//for each outcome select a random one and move entire row to sheet;
for(var i=0; i<genCounselDataByOutcomes.length; ++i){
Logger.log(genCounselDataByOutcomes[i]);
}
QUESTION:
How can I seperate my data as multiple objects in a row of an array and be able to access specific components of each entry as shown in my example above? If this is not exactly possible in this way, is there another solution to this issue?

First of all, your j and new (which by the way is not a valid var name) need a key if they are objects or to be used as array, like below:
var j = [
["Mine", "House"],
["Your", "House"],
["his", "apt"]
];
var newVar = [
[["Mine", "House"] , ["Your", "House"]],
[["his", "apt"]]
];
That said and fixed, you can iterate over your array of arrays and use the column you want to use as filter to get the unique values to be used to group the final result.
Here is the final result:
var j = [
["Mine", "House"],
["Your", "House"],
["his", "apt"]
];
var uniqueValues = [];
var indexColumn = 1; //Here you specify the column you want to use to filter/group the elements from j
j.forEach(function(element){
if(!uniqueValues.includes(element[indexColumn])){
uniqueValues.push(element[indexColumn]);
}
});
//Now you use the `uniqueValues` to filter the `j` array and generate the `groupedArrays` array, which is the one you are looking for:
var groupedArrays = [];
uniqueValues.forEach(function(uniqueValue){
groupedArrays.push(j.filter(function(element){
return element[indexColumn] === uniqueValue;
}));
});
console.log(groupedArrays);
I hope this helps you.
Good luck.

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'];

Acces a multidimensional array from database and save it

I have a 2D array that I get from a database. It looks like that:
arrayDB = [url1,name1,url2,name2,url3,name3, ...]
Now I want to save this array within my code. I tried:
function symbolsArray(syms){
var tableArray = [];
var tableArray2 = [];
for (var i = 0; i < syms.length; i++) {
tableArray[i] = syms[i][0]; //url
tableArray2[i] = syms[i][1]; //Name
}
}
However, this approach is not really suitable because I would need two return values. Is there maybe a better approach or a way to solve the content in a 2D array?
Syms is the data from the database.

Do take a look at
How can I create a two dimensional array in JavaScript?
that answers similar question about 2d arrays in javascript. Try something like-
function symbolsArray(syms){
var tableArray = [];
for (var i = 0; i < syms.length; i++) {
tableArray[i] = [syms[i][0] , syms[i][1]];
}
}

Your array is not two dimensional.You can seperate urls and names like this...
arrayDB = ['url1','name1','url2','name2','url3','name3'];//assumed array
urls = [];//array for urls
names = [];//array for names
for(i=0;i<arrayDB.length;i++){
(i%2==0)?urls.push(arrayDB[i]):names.push(arrayDB[i]);
}
console.log(names);
console.log(urls);

If ive got you right, your problem is that your code needs to return two things, but return does just one, right?
May Return an Object:
return {names: tableArray2,urls:tableArray};
You could use it like this:
var mydata=symbolsArray(arrayDB);
console.log(mydata.names,mydata.urls);
If you just want to deep clone, do:
var cloned=JSON.parse(JSON.stringify(arrayDB));
Or more elegantly:
var cloned=arrayDB.map(el=>el.map(e=>e));

Matching anagrams and pushing to an array

I have a given word, that I want to match against a given list of words, mainList, and establish which words of that given list are anagrams of the given word, and add them to another list, subList.
I feel like my method to do this is fine, but it returns an unexpected result.
For example...
var word = 'master';
var mainList = ['stream', 'pidgeon', 'maters'];
var subList = [];
Then I take the word, split to an array of letters, alphabetise, and join back into a string. With this string I should be able match against any possible anagrams (which I will covert in the same way).
var mainSorted = [];
for (i = 0; i < word.length; i++) {
mainSorted = word.split('').sort().join();
}
This is where it goes wrong. I loop through the mainList array trying to establish if a given item, when converted, matches the original. If so, I want to push the word to the subList array.
for (var i = 0; i < mainList.length; i++) {
var subSorted = mainList[i].split('').sort().join;
if (mainSorted === subSorted) {
subList.push(mainList[i])
}
}
return subList;
...and the value I expect to see for subList is: ['stream', 'maters']
Yet I am returned an empty array instead.
I've gone through this so many times and I cannot see what's going wrong, would really appreciate some help!
Also, I'm aware there's probably more eloquent methods to do this (and I welcome any suggestions) but primarily I want to see where this is going wrong.
Thanks in advance.

You forgot () at the end of join
var subSorted = mainList[i].split('').sort().join;
should be
var subSorted = mainList[i].split('').sort().join();
One non-issue is
for (i = 0; i < word.length; i++) {
mainSorted = word.split('').sort().join();
}
doesnt need to be in a loop
mainSorted = word.split('').sort().join();
alone suffices
as a bonus, here's a tidier way of doing what you are doing
var word = 'master';
var mainList = ['stream', 'pidgeon', 'maters'];
var mainSorted = word.split('').sort().join();
return mainList.filter(function(sub) {
return sub.split('').sort().join() == mainSorted;
});

Sorting 2D javascript array

I have an array containing a list of tags and count.
tags_array[0] = tags;
tags_array[1] = tags_count;
I need to sort the arrays base on the count so that I can pick out the top few tags.

Sort one, while storing the sort comparisons. Then sort the other using those results:
var res = [];
tags_count.sort( function( a, b ){ return res.push( a=a-b ), a; } );
tags.sort( function(){ return res.shift(); } );

Supposing tags and tags_count are 2 arrays of same length, I would first build a proper array of objects :
var array = [];
for (var i=0; i<tags_count.length; i++) {
array.push({tag:tags[i], count:tags_count[i]});
}
And then sort on the count :
array.sort(function(a, b) {return a.count-b.count});
If you need to get your arrays back after that, you may do
for (var i=0; i<array.length; i++) {
tags[i] = array[i].tag;
tags_count[i] = array[i].count;
}
Demonstration

Assuming that both tags and tags_count are arrays with the same length (that part of the question wasn't too clear), the following is one way to do the trick.
var tags_array = new Array();
for (var i = 0; i < tags.length; i++)
{
tags_array[i] = {};
tags_array[i].tagName = tags[i];
tags_array[i].tagCount = tags_count[i];
}
tags_array.sort(function(a,b){return b.tagCount-a.tagCount});
One should note that it might be possible to structure the data in this way from the start instead of rewriting it like this, in which case that is preferable. Likewise, a better structure can be used to save the data, but this will work.