JavaScript sort multiple array

Question

Suppose I have this data

Name	Mark
John	76
Jack	55
Dani	90

and for the grade

Marks	Grade
100-80	A
79 - 60	B
59 - 40	C

suppose i declare the script as

 let data = [
  [John, 76],
  [Jack, 55],
  [Dani, 90]
];

The program should assign the grade with the corresponding mark, how do I sort the grade since we know we cant change the index for mark as usual because each mark assign to different student? The output should display all data in descending order as

Name	Mark	Grade
Dani	90	A
John	76	B
Jack	55	C

Not sure I understand your question. Can you provide your desired output then it is easier to understand what you are trying top accomplish — Persyl
– Persyl, Commented Dec 15, 2021 at 13:11
Although I agree with @Persyl to that it's not so clear what you want, if I understood you correctly I believe you could maybe achieve this by using the .filter()-function. — Kathara
– Kathara, Commented Dec 15, 2021 at 13:13
@Kathara - Im sorry since my question a too vague. The output should display a table for all the student name, mark and grade in descending order — Muhammad Zarith
– Muhammad Zarith, Commented Dec 15, 2021 at 13:30

jsejcksn · Accepted Answer · 2021-12-15 14:19:09Z

2

I would break it up into different functions so that you can handle each task separately. Then you can combine them to produce your desired result, like this:

const grades = [
  ['A', 80],
  ['B', 60],
  ['C', 40],
];

function getGrade (mark) {
  for (const [grade, minMark] of grades) {
    if (mark < minMark) continue;
    return grade;
  }
  return 'F'; // use minimum grade as default if mark is too low
}

function mapToObject ([name, mark]) {
  return {grade: getGrade(mark), name, mark};
}

function sortByHighestMark (a, b) {
  return b.mark - a.mark;
}

const data = [
  ['John', 76],
  ['Jack', 55],
  ['Dani', 90]
];

const result = data.map(mapToObject).sort(sortByHighestMark);
console.log(result);

// and data is unmodified:
console.log(data);

edited Dec 15, 2021 at 14:19

answered Dec 15, 2021 at 13:46

jsejcksn

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Comments

Persyl · Accepted Answer · 2021-12-15 13:27:47Z

0

If you mean that you expect output like:

Dani - A
John - B
Jack - C

Then I would do something like:

A method:

getGrade(points => {
  if(points >= 80 && points <= 100) return 'A'
  if(points >= 60 && points < 80) return 'B'
  return 'C'
})

Then have data as:

    const data = [
                 {name: 'John', value: 76},
                 {name: 'Jack', value: 55},
                 {name: 'Dani', value: 90},
                 ]

Then just do:

data.sort((student1, student2) => {
 if(getGrade(student1.value) === student2.value) return 0
 return (getGrade(student1.value) > getGrade(student2.value))? 1 : -1
})

I hope I understood you correct?

answered Dec 15, 2021 at 13:27

Persyl

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2 Comments

Muhammad Zarith Over a year ago

i'm sorry since you already my uncomplete and vague question but output must include all the data (name, mark and grade). Since all the data ties together ( mark -> student), I dont have idea on how to sort it without change the index for the data assigned

Persyl Over a year ago

Well you can't. Sorting data means ofcourse that you change the index of each item in the array

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