Associate specific string to a number in google sheets - google-sheets

Question

I am using a google forms to collect responses which I will then use to score people. Unfortunately some of those responses only make sense in a non numeric form, here is an example:
Q: What is your most common mode of transportation?
Car
Carpool
Public transportation
Bike
Walk
I want to be able to have google sheets automatically convert those string responses into a number, as in Car will be 20, carpool 15 and so on so that I can "grade" them and give them a score. Can this be done through google forms? Or maybe some sort of dictionary function?
Thank you!

Answer 1

Another method, requiring no coding, would be to make a worksheet with the encoding of the options and then use VLOOKUP to translate them.

Answer 2

Yep, this can be done through Google Forms. Have a look at https://developers.google.com/apps-script/reference/forms/duration-item#setPoints(Integer)
Using their code, you could go something like
var formResponses = FormApp.getActiveForm().getResponses();
// Go through each form response
for (var i = 0; i < formResponses.length; i++) {
var response = formResponses[i];
var items = FormApp.getActiveForm().getItems();
// Assume it's the first item
var item = items[0];
var itemResponse = response.getGradableResponseForItem(item);
if (itemResponse != null && itemResponse.getResponse() == 'Car') {
var points = item.asMultipleChoiceItem().getPoints();
itemResponse.setScore(points * 20);
// This saves the grade, but does not submit to Forms yet.
response.withItemGrade(itemResponse);
}
}
// Grades are actually submitted to Forms here.
FormApp.getActiveForm().submitGrades(formResponses);