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  1. const getLeaderBoard = (students) => {
  2.   // do you magic
  3.   const leaderboard = students.map(student => {
  4.     const totalGrade = Object.values(student.grades).reduce((sum, grade) => sum + grade, 0);
  5.     return {...student, totalGrade};
  6.   });
  7.  
  8.   leaderboard.sort((a,b) => b.totalGrade - a.totalGrade);
  9.   return leaderboard;
  10. }
  11.  
  12. const students = [
  13.   {
  14.     name: '3bkreem',
  15.     class: '3rd',
  16.     grades: {
  17.       math: 25,
  18.       physics: 25,
  19.       programming: 25,
  20.       english: 25
  21.     }
  22.   },
  23.  
  24.   {
  25.     name: 'Samer',
  26.     class: '3rd',
  27.     grades: {
  28.       math: 10,
  29.       physics: 15,
  30.       programming: 12,
  31.       english: 19
  32.     }
  33.   },
  34.  
  35.   {
  36.     name: 'Ahmed',
  37.     class: '3rd',
  38.     grades: {
  39.       math: 20,
  40.       physics: 20,
  41.       programming: 20,
  42.       english: 20
  43.     }
  44.   },
  45.  
  46.   {
  47.     name: 'Ali',
  48.     class: '3rd',
  49.     grades: {
  50.       math: 20,
  51.       physics: 25,
  52.       programming: 19,
  53.       english: 22
  54.     }
  55.   },
  56.  
  57.   {
  58.     name: 'Elgoker',
  59.     class: '3rd',
  60.     grades: {
  61.       math: 23,
  62.       physics: 25,
  63.       programming: 19,
  64.       english: 22
  65.     }
  66.   }
  67. ]
  68.  
  69. console.log(getLeaderBoard(students));
Success #stdin #stdout 0.41s 38960KB
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https://ideone.com/U26HZ3
language:
JavaScript (rhino 1.7.9)
created:
49 days ago
visibility:
public

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