Score calculation, considering negative marking - google-apps-script

Question

I'm trying to find if I can ask a script to calculate a grade where for each good answer it gives +1, and for each wrong answer it substracts -0,25. The calculation will be made in column C, as shown in the screenshot. In the example, the correct score is 6,25 instead of 7.
BTW, the score calculation refers to the key answers on the row 2.

Answer 1

I believe your goal as follows.
You want to calculate for the values of column "C" by checking the background colors of each cell using Google Apps Script.
When the background color of cell is #3ace9c (green), you want to add 1.
When the background color of cell is #ff9900 (orange), you want to reduce 0.25.
You want to calculate for the values of column "C" by comparing the columns "D" to "M" at the row 2 (the referring answer) and each row (after row 3) using Google Apps Script.
When the columns "D" to "M" at the row 2 are the same with each row, you want to add 1.
When the columns "D" to "M" at the row 2 are NOT the same with each row, you want to reduce 0.25.
For this, how about this answer?
Pattern 1:
In this pattern, the background colors are used. The flow of this sample script is as follows.
Prepare an object including the color codes for "good" and "wrong" answers.
Retrieve the background colors from the range of "D3:M" in the sheet.
Calculate the values using the object and the background colors.
Put the values to the column "C" in the sheet.
Sample script:
function myFunction() {
const sheetName = "Sheet1"; // Please set the sheet name.
// 1. Prepare an object including the color codes for "good" and "wrong" answers.
const obj = {"#3ace9c": 1, "#ff9900": -0.25}; // Please set the color codes, if you change the color.
// 2. Retrieve the background colors from the range of "D3:M" in the sheet.
const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
const backgrounds = sheet.getRange("D3:M" + sheet.getLastRow()).getBackgrounds();
// 3. Calculate the values using the object and the background colors.
const result = backgrounds.map(r => [r.reduce((c, e) => c += obj[e], 0)]);
// 4. Put the values to the column "C" in the sheet.
sheet.getRange(3, 3, result.length, 1).setValues(result);
}
Pattern 2:
In this pattern, the referring answer of the row 2 is used. The flow of this sample script is as follows.
Retrieve values from the range of "A2:M" in the sheet.
Retrieve the referring answer.
Calculate the values of each values by comparing the referring answer, and create an array including the result values.
Put the values to the column "C" in the sheet.
Sample script:
function myFunction() {
const sheetName = "Sheet1"; // Please set the sheet name.
// 1. Retrieve values from the range of "A2:M" in the sheet.
const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
const values = sheet.getRange("A2:M" + sheet.getLastRow()).getValues();
// 2. Retrieve the referring answer.
const answers = values.shift();
answers.splice(0, 3);
// 3. Calculate the values of each values by comparing the referring answer, and create an array including the result values.
const result = values.map(([,,c,...dm]) => [dm.reduce((c, e, i) => e == answers[i] ? c + 1 : c - 0.25, 0)]);
// 4. Put the values to the column "C" in the sheet.
sheet.getRange(3, 3, result.length, 1).setValues(result);
}
References:
map()
reduce()
getBackgrounds()
getValues()
setValues()