循环遍历 Google 表格中的二维数组以创建每个日期和 ID 条目的策略

Question

I have a Google Sheet that contains data I need to manipulate. It is essentially a list of assignments by student. The original columns are:

Name, ID, Assignment 1, Assignment 2, Assignment 3, Assignment 4, Date, Overall Grade

Using existing code, I am concatenating the Assignments into a single field and creating an array with these columns:

ID, Name, Assignments, Date, Overall Grade

The resulting array looks like this:

[ [ '1234',
    'Santa Claus',
    'US History Chapter 1.1, , , ',
    Fri Nov 18 2022 00:00:00 GMT-0800 (Pacific Standard Time),
    'B+' ],
  [ '1234',
    'Santa Claus',
    'US History Chapter 2.1, US History Chapter 1.1, , ',
    Thu Nov 17 2022 00:00:00 GMT-0800 (Pacific Standard Time),
    'B' ],
 [ '12222',
    'Mary Poppins',
    'US History Chapter 8, , , ',
    Fri Nov 18 2022 00:00:00 GMT-0800 (Pacific Standard Time),
    'A' ]]

On a separate sheet I have a list of dates. What I want is to have a line for every single student and date combination and the assignment data if it exists. Eg If the dates are Nov 17, Nov 18, and Nov19 and there are 2 students with data in the list, there would be 6 total entries sorted by student then by date. For the Assignments column, there would only be data if there was an assignment entered for that date and that student. Otherwise it would be blank. For example:

ID	Name	Assignments	Date	Grade
1234	Santa Claus	Chapter 2.1, US History Chapter 1.1	Nov17	B
1234	Santa Claus	US History Chapter 1.1	Nov18	B+
1234	Santa Claus		Nov19
12222	Mary Poppins		Nov17
12222	Mary Poppins	US History Chapter 8	Nov 18	A
12222	Mary Poppins		Nov19

What I think is needed is something like this:

1. Get unique list of all student IDs from the array
2. Get list of dates from the sheet
3. Use a nested loop to go through each date and each student to create the lines. If there is a match for the assignment data, add it, if not, leave that blank.

I'm just not sure how to manipulate the array to do something like that. How would I approach this?

Answer 1

Although, unfortunately, I cannot know your actual array, from your showing sample array and a sample table, how about the following sample script?

Sample script:

const array = [,,,]; // Please set your array.

const res = Object.entries(array.reduce((o, e) => (o[e[0]] = o[e[0]] ? [...o[e[0]], e] : [e], o), {}))
  .sort(([a], [b]) => Number(a) > Number(b) ? 1 : -1)
  .flatMap(([, v]) => v.sort((a, b) => a[3].getTime() > b[3].getTime() ? 1 : -1));

console.log(res)

• In this sample script, first, an object is created by checking the column "A". And, sort the array by the column "A". And, for each element, sort the column "D". And, all values are merged as a 2-dimensional array.

Note:

• If this sample script doesn't return your exected values, can you provide the detailed sample input values and the sample output values? By this, I would like to confirm it.

References:

• reduce()
• sort()