comparing json array rows with value on destination rows (apps script) - arrays

Question

I've use this script before, and work well, here's script, This script copies the values and paste to last row in google sheet,
function doPost(request = {}) {
const { parameter, postData: { contents, type } = {} } = request; //request data
const { dataReq = {} } = JSON.parse(contents); //content
const { fname = {} } = JSON.parse(contents); //function name
const response = {
status: "function not found: " + fname, // prepare response in function not found
data2: dataReq
}
switch (fname) { //function selection
case 'pasteData':
var output = JSON.stringify(pasteDAta(dataReq)) //call function with data from request
break
default:
var output = JSON.stringify(response)
break
}
return ContentService.createTextOutput(output).setMimeType(ContentService.MimeType.JSON); //response to frontend
}
function pasteDAta(dataReq) {
const id = '1_27rjNQmlXrwVKpLWUbGrJYPJufGRa7Dk-XEKcNAHr0'; //id of Google Sheet
var sheet = SpreadsheetApp.openById(id).getSheetByName('Sheet1'); //sheet
var headings = sheet.getDataRange().getValues()[0]; //Headers
var values = dataReq.map((a) => {
let holder = [];
for (x in headings) {
let output = (headings[x] in a) ? a[headings[x]] : '';
holder.push(output);
}
return holder;
});
var len = values.length;
sheet.getRange(sheet.getLastRow() + 1, 1, len, values[0].length).setValues(values);
return "Numbers of sheets added: " + len;
}
I want this script to be able to check the row values ​​in column b (source [json]), if the value in the source rows in column b is the same as the value in the destination rows in column b (google sheet) then the values ​​are replaced all but if not, the values ​​are copied to the last rows. If it is possible, can anyone give me a modified working script?
Example
First condition; Before (Destination Sheet)
Date
Code
Name
Grade
02/04/21
Math1
John
80
02/04/21
Math2
John
80
Expected results
After replacing (from JSON)- if Column B (Code) is the same as the source
Date
Code
Name
Grade
02/04/21
Math1
Dare
78
02/04/21
Math2
Brian
90
Second condition; Before (Destination Sheet)
Date
Code
Name
Grade
02/04/21
Bio1
Anton
78
02/04/21
Bio2
Julian
65
Expected results
After after appending to last row (from JSON)- if Column B isn't same as the source
Date
Code
Name
Grade
02/04/21
Bio1
Anton
78
02/04/21
Bio2
Julian
65
02/04/21
Math1
Dare
78
02/04/21
Math2
Brian
90

Answer 1

Try to change the function pasteDAta() this way:
function pasteDAta(dataReq) {
const id = "1_27rjNQmlXrwVKpLWUbGrJYPJufGRa7Dk-XEKcNAHr0";
var sheet = SpreadsheetApp.openById(id).getSheetByName("Sheet1");
// get header and the rest data from the sheet
var [ headings, ...data ] = sheet.getDataRange().getValues();
var values = dataReq.map((a) => {
let holder = [];
for (x in headings) {
let output = headings[x] in a ? a[headings[x]] : "";
holder.push(output);
}
return holder;
});
var len = values.length;
var new_values = []; // values to add at the bottom of the sheet
var col_b = data.map(x => x[1]); // get column B from the data
values.forEach(row => {
// find an index of the row with the same value in cell B
var row_index = col_b.indexOf(row[1]);
// if nothing was found add the row to the new values
if (row_index == -1) new_values.push(row);
// else change the found row on the sheet
else sheet.getRange(row_index + 2, 1, 1, row.length).setValues([row]); // '+2' due the header
})
// add the new values at the bottom of the sheet
if (new_values.length > 0)
sheet.getRange(sheet.getLastRow() + 1, 1, len, new_values[0].length).setValues(new_values);
return "Numbers of sheets added: " + len;
}