Find matches for two columns on two sheets google script - google-apps-script

Question

Im am trying to match 2 columns (A:B) in sheet1 with 2 columns in sheet2 (A:B) and if there is a match, copy contents of column C matching row in sheet1 to matching row in sheet2.
I've tried to adapt several scripts without success. The code below comes closest to my requirements, but with my limited knowledge of script I haven't been able to adapt it to my exact needs.
Sheet1
A B C
Week Rotation Working
Week1 11 In
Week1 5 In
Week1 4 In
Week1 3 In
Week1 3 Off
Week1 7 Off
Sheet2
A B C
Week Rotation Working
Week1 6
Week1 5
Week1 4
Week1 3
Week1 3
Week1 11 (In should be copied to here)
My code:
function MatchColumns(){
// gets spreadsheet A and the range of data
var sheetA
=SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Testa");
var dataA = sheetA.getRange(2, 1, sheetA.getLastRow(),
2).getValues();
// gets spreadsheet B and the range of data
var sheetB =
SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Test2");
var dataB = sheetB.getRange(2, 1, sheetB.getLastRow(),
1).getValues();
// Added
var res = [];
for (var b in dataB) {
for (var a in dataA) {
if (dataA[a][0] == dataB[b][0]) res.push([dataA[a][3]]);
}
if (b != res.length - 1) res.push([""]);
}
sheetB.getRange(2, 2, res.length, res[0].length).setValues(res);

Answer 1

Note that JavaScript is one of the many languages that use 0-base indexing. So res.push([dataA[a][3]]) is placing the 4th value from the row into the result array, i.e. Column D.
Your dataA and dataB variables don't actually include the column C data, as you initialized them with only 2 columns of data. So dataA[a][2] and dataA[a][3] are both undefined.
You probably don't want to collect these new values into an array via push, as this will lose the correlation between which row you matched in A & B, and which row you write into. To avoid losing existing information in column C, you need to read it from sheet 2 and assign to the specific index:
var destC = sheet2.getRange(2, 3, sheet2.getLastRow() - 1, 1).getValues();
/** Find matched rows */
...
destC[b][0] = dataA[a][2];
...
// Lastly, write values
sheet2.getRange(2, 3, destC.length, 1).setValues(destC);

Answer 2

Try using a nested for to iterate through the Values in Sheet1 and Sheet2 and compare them with
function MatchColumns(){
// gets spreadsheet A and the range of data
var sheetA = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Sheet1");
var dataA = sheetA.getRange(2, 1, sheetA.getLastRow() - 1, 2).getValues();
// gets spreadsheet B and the range of data
var sheetB = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Sheet2");
var dataB = sheetB.getRange(2, 1, sheetB.getLastRow() - 1, 2).getValues();
for (var x = 0; x < sheetA.getLastRow() - 1; x++){
for (var y = 0; y < sheetB.getLastRow() - 1; y++){
if (dataA[x][0] == dataB[y][0]){
if (dataA[x][1] == dataB[y][1]){
sheetB.getRange(y + 2, 3).setValue(sheetA.getRange(x + 2, 3).getValue());
}
}
}
}
}
This copies the value of column C in Sheet1 to column C in Sheet2 if the corresponding cells in columns and B match.