We Keep Coding

How to write (SetValues) to a Google Sheet using a filtered forEach loop?

I've been trying for hours to make the following Google Apps Script work. What it needs to do, is send emails (from an html-template) to anyone that:
has a complete Event Schedule (which is completed if they have been
assigned to at least 4 events, which is counted in column Q);
has NOT been sent an email earlier (which is kept track of in column
R);
The script keeps track of errors in column S, i.e. if there's no email address provided.
It appears it only works:
if I comment out
data = data.filter(function(r){ return r[17] == true & r[16] > 3});
or if I comment out
ws.getRange("S3:S" + ws.getLastRow()).setValues(errors);
ws.getRange("R3:R" + ws.getLastRow()).setValues(mailSucces);
How can I get this script to work properly?
A copy of the Google Sheet I'm referring to is this one:
https://docs.google.com/spreadsheets/d/1sbOlvLVVfiQMWxNZmtCLuizci2cQB9Kfd8tYz64gjP0/edit?usp=sharing
This is my code so far:
function SendEmail(){
var voornaam = 3;
var achternaam = 4;
var email = 5;
var event1 = 9;
var event2 = 10;
var event3 = 11;
var event4 = 12;
var event5 = 13;
var event6 = 14;
var event7 = 15;
var emailTemp = HtmlService.createTemplateFromFile("email");
var ws = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Events Day 1");
var datum = ws.getRange(1,3).getValue();
var spreker = ws.getRange(1,6).getValue();
var data = ws.getRange("A3:R" + ws.getLastRow()).getValues();
data = data.filter(function(r){ return r[17] == false && r[16] > 3}); //Either this needs to be commented out...
let errors = [];
let mailSucces = [];
data.forEach(function(row){
try{
emailTemp.voornaam = row[voornaam];
emailTemp.email = row[email];
emailTemp.datum = datum;
emailTemp.spreker = spreker;
emailTemp.event1 = row[event1];
emailTemp.event2 = row[event2];
emailTemp.event3 = row[event3];
emailTemp.event4 = row[event4];
emailTemp.event5 = row[event5];
emailTemp.event6 = row[event6];
emailTemp.event7 = row[event7];
var htmlMessage = emailTemp.evaluate().getContent();
GmailApp.sendEmail(
row[email],
"Here you go! Your personal schedule for the event of " + datum,
"Your emailprogramm doesn't support html.",
{
name: "Event Organisation Team", htmlBody: htmlMessage, replyTo: "info#fakeemail.com"
});
errors.push([""]);
mailSucces.push(["TRUE"]);
}
catch(err){
errors.push(["Error: no message sent."]);
mailSucces.push(["False"]);
}
}); //close forEach
ws.getRange("S3:S" + ws.getLastRow()).setValues(errors); //or this and the next line need to be commented out.
ws.getRange("R3:R" + ws.getLastRow()).setValues(mailSucces);
}
Edit I have been trying and thinking en trying... but still haven't found out how to make it work. But I also got understanding of why it's not working; I just don't know how to get it fixed.
Let me elaborate on the problem a bit more:
The problem is, that within the forEach loop the range is a filtered variant of the data, pulled from the spreadsheet with getValues. Therefore, writing data back with ws.getRange("R3:R" + ws.getLastRow()).setValues(mailSucces); results in mismatched checkmarks in te spreadsheet.
So, somehow I need to put the range of the previous used filter data = data.filter(function(r){ return r[17] == false & r[16] > 3}); in a variable...? I guess?
Furthermore, I don't think it's wise to use setValue within the loop, because (from what I understand from my searching on the topic) this results in a slow script, because every loop the script makes an API call to write in the spreadsheet. Hence the errors.push and mailSucces.push, and my attempt to do a setValue at the end, after the loop is finished.
Can someone help me to finish this problem?

The problem is different size of the range you write to and data you are writing in.
Try replacing:
ws.getRange("S3:S" + ws.getLastRow()).setValues(errors);
ws.getRange("R3:R" + ws.getLastRow()).setValues(mailSucces);
With:
ws.getRange(3, 19, errors.length, 1).setValues(errors);
ws.getRange(3, 18, mailSucces.length, 1).setValues(mailSucces);
You should use this variation of getRange
https://developers.google.com/apps-script/reference/spreadsheet/sheet#getrangerow,-column,-numrows,-numcolumns
Your data has non-fixed number of rows and fixed number of columns (1). In general case your data will be matrix of X rows and Y columns. For that purpose you can make it completely dynamic:
sheet.getRange(startRow, startColumn, data.length, data[0].length)
Just make sure data.length is > 0 before you do this, otherwise data[0].length will break.
Edit:
I started writing a comment but it got too long. There are couple of things that may go wrong with sending emails. First thing I noticed is that you use & in filter, but in AppsScript/JavaScript/C-like-languages, you should use && for logical AND. Now the email: you only detect the code break with the catch block. At this point you don't know why the code breaks it could be anything. With GmailApp I recommend you to use createDraft while developing, then when all ok replace it with sendEmail for the final version, both functions have the exact same parameters, thank you Google devs ;-).
To find out the exact problem you should get the error message on break and display it. err.stack should tell you pretty much everything:
catch(err){
Logger.log(err.stack); // Added
errors.push(["Error: no message sent."]);
mailSucces.push(["False"]);
}
Run the sendEmail function from the code editor and you should see the Log for each catch(err) pass.

Is there a JavaScript function to link ranges (top range 0----100 bottom range 55%----24%) known top input, want bottom value output

The following image will help explain what I am trying to achieve...
The top line (A) is a given calculated JavaScript value, lets call this the input.
The bottom line (B) is the output, so whatever input to (A) is given (will always be within the range) if a line (like the green one shown) were to be drawn I need the value of the output.
I have tried to search for phrases like "linked range", "parallel linked values" and similar but I think half of my problem is not knowing what this kind of calulation is called.
Usually I would be able to show what I have tried but on this one I really dont have a clue where to start.
Any help greatly appreciated.

So get the percentage in A
percentage = A[value] / ( A[max] - A[min] )
Use that to figure out the value in second
result = B[max] - percentage * (B[max] - B[min])
so basic JavaScript
var aMin = 0;
var aMax = 500;
var bMin = 24;
var bMax = 55;
var aValue = 100;
var percentage = aValue / ( aMax - aMin );
var result = bMax - percentage * (bMax - bMin);
console.log(result + "%");

how to count how many times a function has been run in javascript? and then display it on page?

Im working on a betting script and basically have two functions, one for if I win, and one for if I lose. I was wondering, whether any of you guys can help me with the code to be able to count how many times the function has been run,(or how many i have won, and how many times I have lost.)
I was wondering whether it would then be possible to create an element on the page which would display these?
Any help would be great. Im new to javascript and bit unsure how to make variables count??
Let me know if you need more info?

Set up two variables that equal zero, and each time there is a win/loss detected, increment the corresponding value, like so:
var wins = 0,
losses = 0;
function iWin() {
wins += 1;
}
function iLose() {
losses += 1;
}
EDIT:
In order to display your wins/losses, add the following to your html
<p id="wins"></p>
<p id="losses"></p>
And just add two lines of code to the JavaScript code above:
var wins = 0,
losses = 0;
function iWin() {
wins += 1;
document.getElementById('wins').innerHTML = wins;
}
function iLose() {
losses += 1;
document.getElementById('losses').innerHTML = losses;
}
Good luck!

Is Javascript multiplying these values wrong?

Allright, I know what machine precision is, but this, I can't understand...
Code:
console.log("meanX",meanX);
meanX2 = meanX * meanX; //squared
console.log("meanX2",meanX2);
Console output:
meanX 300.3
meanX2 28493.4400000000002
In case you are wondering, the correct value for meanX2 would be 90180.09
And this is only one of the many examples visible in the screenshot..
.toFixed(6) seems to fix this... But I have no idea why it doesn't work without it.
Edit
Ok, I don't want to post the whole program code here because in first place I'm not the only author, and second, I also wouldn't like this to be copied without our permission. But I'll gladly explain how I get this error and will post the whole method/function code here.
This code belongs, as you may have guessed from the window title, to a lane detection algorithm. We use Three.js/webgl to run some pre processing shaders on each frame of a video and then we analyze the resulting image. The method/function you see on the screenshot is a perpendicular line fitting algorithm and is part of the whole thing.
I can see the algorithm running nicely because I have the lane being drawn on top of the video, and It is well placed. Until suddenly the lane turns into an horizontal bar. This unexpected behavior happens exactly because of the phenomenon I described here, since it's from that moment that I start to see wrong math in the console.
Also, because the video and algorithm run at slightly different fps everytime, the problem doesn't always happen in the same moment of the video, and sometimes It doesn't happen at all.
Here is the code (it has some alterations because I was trying to isolate the issue):
this.perpendicularLineFit = function (points, slopeSign) {
var count = points.length;
var sumX = 0,
sumY = 0;
var sumX2 = 0,
sumY2 = 0,
sumXY = 0;
var meanX, meanY;
var i, lowp = {}, highp = {};
var B;
var slope;
var originY;
for (i = 0; i < count; i++) {
sumX += points[i].x;
sumY += points[i].y;
sumX2 += points[i].x * points[i].x;
sumY2 += points[i].y * points[i].y;
sumXY += points[i].y * points[i].x;
}
meanX = sumX / count;
meanY = sumY / count;
//If you uncoment this, problem reappears:
//var numeratorLeft = meanY * meanY;
console.log("meanX",meanX);
var meanX2 = meanX*meanX;
console.log("meanX2",meanX2);
var numerator = (sumY2 - count * (meanY * meanY)) - (sumX2 - count * meanX2);
var denominator = (count * meanX * meanY - sumXY);
B = 0.5 * (numerator / denominator);
slope = -B + slopeSign * Math.sqrt(B * B + 1);
originY = meanY - slope * meanX;
slope = isNaN(slope) ? slopeSign : slope;
originY = isNaN(originY) ? originY : originY;
lowp.y = this.lowY;
lowp.x = (this.lowY - originY) / slope;
highp.y = this.highY;
highp.x = (this.highY - originY) / slope;
return {
low: lowp,
high: highp
};
};
Now, I was trying to understand what was causing this, and the most bizarre thing is that it seems that when I place a statement of this form
var x = ... meanY * meanY ...;
before the meanX2 attribution, the issue happens. Otherwise it doesn't.
Also, I tried to catch this anomaly in the debugger but just when I enter the debugging tab, the problem disapears. And the values turn correct again.
I certainly don't believe in black magic, and I know that you are probably skeptic to this.
I would be too. But here is a link to a video showing it happening:
The video
Edit2:
I managed to reproduce this issue in another computer.. Both having ubuntu and using firefox (versions 20 and 21).
Edit3:
I'm sorry it took so much time! Here is a zip containing the issue. Just run it in any webserver. The code mentioned is in LaneDetection.js. Search for "HERE" in the file to find it.
https://docs.google.com/file/d/0B7y9wWiGlcYnYlo1S2pBelR1cHM/edit?usp=sharing
The problem might not happen in the first attempts. If that's the case refresh the page and try again. When the lines get horizontal you know it's there. As I said, I saw this problem happening in firefox versions 20 and 21 on ubuntu. In chrome it never happened.
By the way, I noticed that changing javascript.options.typeinference flag in firefox seems to stop the problem... I don't know exactly what that flag does, but maybe this optimization is not correctly implemented in firefox?

I can't say for sure that I actually have an answer but I think that I have confirmed that basilikum was correct to suggest a memory problem. Here's what I did: I took the first ten entries from your screenshot and calculated the correct answer. I then converted the correct answer and the wrong answer into the hexidecimal representation of the double-precision float. What I ended up with was the following:
292.416^2 = 85507.506 = 40F4E0381C71C71E
changed to 27583.373 = 40DAEFEB1C71C722
293.166^2 = 85946.694 = 40F4FBAB1C71C72A
changed to 27583.373 = 40DAEFEB1C71C722
295.818^2 = 87508.396 = 40F55D4658DC0876
changed to 28041.024 = 40DB62419637021F
294.500^2 = 86730.250 = 40F52CA400000000
changed to 27583.373 = 40DAEFEB1C71C722
297.000^2 = 88290.000 = 40F58E2000000000
changed to 28041.024 = 40DB62419637021F
221.750^2 = 49173.062 = 40E802A200000000
changed to 24964.000 = 40D8610000000000
300.300^2 = 90180.090 = 40F6044170A3D70A
changed to 28493.440 = 40DBD35C28F5C290
220.200^2 = 48488.040 = 40E7AD0147AE147B
changed to 25408.360 = 40D8D0170A3D70A4
300.600^2 = 90360.360 = 40F60F85C28F5C29
changed to 28493.440 = 40DBD35C28F5C290
213.000^2 = 45369.000 = 40E6272000000000
changed to 28032.326 = 40DB6014E5E0A72E
There's no persistent pattern to the change but there are a couple instances that are very telling of a memory issue. In the first two entries you can see that bytes 1, 2 and 3 were unchanged. In the 9th entry there's something even more odd. It would appear that bytes 0 - 3 were shifted left by exactly 4 bits! Upon considering the statement that the problem doesn't arise until after some time has passed and in light of these two anomalies, I'm fairly confident that you're encountering some sort of memory issue. Could it be, dare I say, a stack overflow?

Javascript - Calculating monetary totals

I have a page on a site that calculates rate totals for a rental, which are optional. The javascript serves nothing more but to show you the updated total if you select or unselect checkbox options.
Here is what I've tried. It appears to work, but it is adding 2 cents to every other click for one of the checkboxes, I believe because toFixed rounds. How can I keep the number from rounding?
function update_rate(state, amount, field) {
if (state == true) {
rate = parseFloat($('span.rateTotal').text()) + amount;
rate = rate.toFixed(2);
due = parseFloat($('span.'+field).text()) + amount;
due = due.toFixed(2);
$('span.rateTotal').text(rate);
$('span.'+field).text(due);
} else {
rate = parseFloat($('span.rateTotal').text()) - amount;
rate = rate.toFixed(2);
due = parseFloat($('span.'+field).text()) - amount;
due = due.toFixed(2);
$('span.rateTotal').text(rate);
$('span.'+field).text(due);
}
}
Checkbox HTML:
<cfinput type="checkbox" name="linen_service" id="linen_service" checked="checked" value="0" onClick="update_rate(this.checked, #reservationQuery[7].xmlChildren[i]['dblAmount'].xmlText#, 'second-due');" />
Basically passes in the amount of the option, checkbox state, and the name of the field that should be affected.
Edit: Fiddle URL: http://jsfiddle.net/nGrVf/6/

Are you stuck with your your types?
I find it is almost always better to store monetary values in whole numbers of the lowest unit (e.g, cents, or pence) and then add the decimal point two places from the right when displaying.
So the conversions might look like:
var dollars = 100.43;
var cents = Math.round(dollars * 100);
//convert for display
var sCents = String(cents);
var display = sCents.substr(0, sCents.length-2) + "." + sCents.substr(sCents.length-2,2);
alert(display);
Can be seen here at http://jsfiddle.net/jameswiseman76/jhjtP/
Then you don't have to worry about any ugly floating point conversions.

The simplest solution I can think up is to round it down (using muls and floor): i.e.
rate = Math.floor(rate * 100)/100;
Edit: After a bit of testing, I found that there is nothing wrong with the given code. This means the calculation error comes from another part of the code or from the unknown amount variable.