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IF Function - Google Scripts - multiple criteria

I'm trying to run an IF function to match the date in the first column to "last month" and the date in the last column to "newest date" and copy and paste all of the rows matching this criteria (excluding the first and last column) to the bottom of the list.
This is the script I'm running and it isn't finding any matches when I know for a fact there are at least 100 rows matching this criteria:
function myFunction() {
var MCS = SpreadsheetApp.openById('[ID REMOVED FOR THIS Q]');
var MRB = MCS.getSheetByName('Media Rates Back');
var MRBrange = MRB.getRange(1,1,MRB.getLastRow(),1).getValues();
var dest = MRBrange.filter(String).length + 1;
var LM = new Date();
LM.setDate(1);
LM.setMonth(LM.getMonth()-1);
var LMs = Date.parse(LM);
var Datenew = MRB.getRange(MRB.getLastRow(),MRB.getLastColumn()).getValue();
var Datecol = MRB.getRange(1,6,MRB.getLastRow(),1).getValues();
var Datenews = Date.parse(Datenew);
for(var i=0; i<MRBrange.length; i++) {
if(Date.parse(MRBrange[i])==LMs && Date.parse(Datecol[i])==Datenews ) {
var NewRange = MRB.getRange(i,2,(MRB.getLastRow()-i),5);
var NewRangeV = NewRange.getValues();
var destination = MRB.getRange(MRB.getLastRow()+1,2);
Logger.log(NewRange);
NewRange.copyTo(destination);
}else{
Logger.log(i);
}
}}
Any help would be appreciated!

Rather than get the columns as separate ranges, I would get the entire range as one array, then loop over that and check the two columns.
I'm also assuming your values are formatted as dates in the Sheet, in which case you don't need to use Date.parse(), and that your actual date logic is correct.
You can try using the debugger and set a breakpoint at the IF, so you can check the values it is comparing. or put a Logger.log call to list your comparisons.
var last_month_column = 1;
var newest_date_column = MRB.getLastColumn();
var MRBrange = MRB.getRange(1,1,MRB.getLastRow(),newest_date_column).getValues();
for(var row in MRBrange) {
if(MRBrange[row][last_month_column]==LMs && Datecol[row][newest_date_column] ==Datenews ) {
/* your copy logic here */
}else{
Logger.log(i);
}
}

I think the problem may be that MRBrange is a 2d Array. So I used another loop to convert it to a 1d array.
function myFunction() {
var MCS = SpreadsheetApp.openById('[ID REMOVED FOR THIS Q]');
var MRB = MCS.getSheetByName('Media Rates Back');
var MRBrangeA = MRB.getRange(1,1,MRB.getLastRow(),1).getValues();//2d array
var MRBrange=[];
for(var i=0;i<MRBrangeA.length;i++)
{
MRBrange.push(MRBrangA[i][0]);//1d array
}
var dest = MRBrange.filter(String).length + 1;
var LM = new Date();//current day
LM.setDate(1);//first day of month
LM.setMonth(LM.getMonth()-1);//first day of last month
var LMs = Date.parse(LM);
var Datenew = MRB.getRange(MRB.getLastRow(),MRB.getLastColumn()).getValue();
var Datecol = MRB.getRange(1,6,MRB.getLastRow(),1).getValues();
var Datenews = Date.parse(Datenew);
for(var i=0; i<MRBrange.length; i++) {
if(Date.parse(MRBrange[i])==LMs && Date.parse(Datecol[i])==Datenews ) {
var NewRange = MRB.getRange(i,2,(MRB.getLastRow()-i),5);
var NewRangeV = NewRange.getValues();
var destination = MRB.getRange(MRB.getLastRow()+1,2);
Logger.log(NewRange);
NewRange.copyTo(destination);
}else{
Logger.log(i);
}
}}

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.

Javascript: Convert 2D Integer array to base64 string and back

I'm not much familiar with javascript, but I faced a need to send and receive big static 2D integer arrays (where values are > 255) as base64 strings (this is essential). At the moment I've came up with this straightforward and inefficient solution converting them element-wise and manually constructing strings, which, as far as I understand, should involve a lot of copying of the data and turns to be very slow.
Can it be done in a more efficient way, if possible without usage of some big side libraries like Node.js, etc?
//----------- serializing/deserializing procedures
//encoding int contours array to be sent as base64 string
function getBase64IntArray(arr) {
var width = arr.length;
//This works given the inner arrays length never changes.
var height = arr[0].length;
//string that would contain data
var str = width.toString()+","+height.toString()+",";
for(var x = 0; x < height; x++) {
for(var y = 0; y < width; y++) {
str = str + arr[x][y].toString() + ",";
}
}
var str64 = btoa(str);
return str64;
}//getBase64IntArray
//deconding this string back to array
function getIntArrayfromBase64(str64) {
var str = atob(str64);
//first occurence of ","
var width_str = str.substr(0,str.indexOf(','));
str = str.substr(str.indexOf(',')+1); // cut the beginning
//again first occurence of ","
var height_str = str.substr(0,str.indexOf(','));
str = str.substr(str.indexOf(',')+1); // cut the beginning
var width = parseInt(width_str);
var height = parseInt(height_str);
//declare new array and fill it
var arr = new Array(height);
var curr_str = "";
for(var x = 0; x < height; x++) {
arr[x] = new Array(width);
for(var y = 0; y < width; y++) {
//first occurence of ","
curr_str = str.substr(0,str.indexOf(','));
// cut the beginning
str = str.substr(str.indexOf(',')+1);
arr[x][y]=parseInt(curr_str);
}
}
return arr;
}// getIntArrayfromBase64
Sending/receiving works:
//----------- example usage
function send(){
//encoding to base64
var arr = [
[1, 2],
[3, 4]
];
var base64 = getBase64IntArray(arr);
webSocket.send(base64);
}
webSocket.onmessage = function(event){
//reading array as base64 string
var arr = getIntArrayfromBase64(event.data);
var width = arr.length;
var height = arr[0].length;
writeResponse("Received "+width+" "+height+" "+arr[0][0]+arr[1][1]);
};

How about going through JSON? JSON will add minimal overhead to the wire format, but the serialization/deserialization will be fast, because it's implemented natively.
function getBase64IntArray(arr) {
return btoa(JSON.stringify(arr))
}
function getIntArrayfromBase64(str64) {
return JSON.parse(atob(str64))
}

Copy array --> stack or heap overflow?

I have an array named globalArrayAllTrades as you see below. I simply like to INVERT the date in a new copy of the array. So I loop through, create a new object and add it to the new array - simple.
Then function does exactly as expected. BUT if the array contains too many objects the code fails with a "FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory".
My laptop has 8 GB of memory...When the NODEJS process crashes it uses about 1.5 GB and about 70% of of totally amount of available memory is used.
I do run the NODEJS app with the parameter: --max_old_space_size=5000 which normally fixes every thing. But not this one and i have tried MANY different ways to code the same function - BUT each and every time - it fails...unless the original array is smaller.
How can I fix this issue?
function invertTrades(){
var original = globalArrayAllTrades.slice();
globalArrayAllTrades.length = 0;
globalListAllTrades.length = 0;
for(var i = 0; i < original.length; i++){
var objS = original[i];
var objE = original[original.length-1-i];
var objInv = new TradePoint(objS.number, objS.matchdate, objE.price, objE.size, objE.issell);
globalArrayAllTrades.push(objInv);
globalListAllTrades[objInv.matchdate] = objInv;
}
}

You can save some memory by making original just contain the properties you need to invert, not the whole TradePoint object. Then you don't need to construct new TradePoint objects, you can modify them in place.
var original = globalArrayAllTrades.map(function(trade) {
return {
trade.price,
trade.size,
trade.issell
};
}).reverse();
globalArrayAllTrades.forEach(function(trade, i) {
trade.price = original[i].price;
trade.size = original[i].size;
trade.issell = original[i].issell;
});
And since all the objects were modified in place, there's no need to update globalListAllTrades.
Another way is to swap the price, size, and issell properties in place between the pairs of elements:
var midpoint = Math.floor(globalArrayAllTrade.length/2);
for (var i = 0; i < midpoint; i++) {
var objS = globalArrayAllTrades[i];
var objE = globalArrayAllTrades[globalArrayAllTrades.length-1-i];
var temp = objS.price;
objS.price = objE.price;
objE.price = temp;
temp = objS.size;
objS.size = objE.size;
objE.size = temp;
temp = objS.issell;
objS.issell = objE.issell;
objE.issell = temp;
}

Have you considered just doing this?
// Copy array and then reverse it
var newArray = [].concat(original).reverse();
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse

I would suggest avoiding to copy that array:
function getInverse(i) {
var objS = globalArrayAllTrades[i];
var objE = globalArrayAllTrades[globalArrayAllTrades.length-1-i];
var objInv = new TradePoint(objS.number, objS.matchdate, objE.price, objE.size, objE.issell);
globalListAllTrades[objInv.matchdate] = objInv;
return objInv;
}
function invertTrades(){
globalListAllTrades.length = 0;
for (var i = 0, l = Math.floor(globalArrayAllTrades.length/2); i < l; i++) {
var j = globalArrayAllTrades.length-1-i;
var a = getInverse(i);
var b = getInverse(j);
globalArrayAllTrades[i] = a;
globalArrayAllTrades[j] = b;
}
}

Transform a string into array using javascript

I have a string like this:
string = "locations[0][street]=street&locations[0][street_no]=
34&locations[1][street]=AnotherStreet&locations[1][street_no]=43";
What must I do with this string so i can play with locations[][] as I wish?

You could write a parser:
var myStr = "locations[0][street]=street&locations[0][street_no]=34&locations[1][street]=AnotherStreet&locations[1][street_no]=43";
function parseArray(str) {
var arr = new Array();
var tmp = myStr.split('&');
var lastIdx;
for (var i = 0; i < tmp.length; i++) {
var parts = tmp[i].split('=');
var m = parts[0].match(/\[[\w]+\]/g);
var idx = m[0].substring(1, m[0].length - 1);
var key = m[1].substring(1, m[1].length - 1);
if (lastIdx != idx) {
lastIdx = idx;
arr.push({});
}
arr[idx * 1][key] = parts[1];
}
return arr;
}
var myArr = parseArray(myStr);

As Shadow wizard said, using split and eval seems to be the solution.
You need to initialize locations first, if you want to avoid an error.
stringArray=string.split("&");
for (var i=0;i<stringArray.length;i++){
eval(stringArray[i]);
}
However, you might need to pay attention to what street and street_no are.
As is, it will produce an error because street is not defined.
Edit: and you'll need to fully initialize locations with as many item as you'll have to avoid an error.