Group by and sum

Directions

Group by objects in an array and get the sum of the group

Examples:

Input:

  [ 
    { Phase: 'Phase 1', Step: 'Step 1', Task: 'Task 1', Value: '5' },
    { Phase: 'Phase 2', Step: 'Step 2', Task: 'Task 1', Value: '35' },
    { Phase: 'Phase 1', Step: 'Step 2', Task: 'Task 1', Value: '15' },
    { Phase: 'Phase 1', Step: 'Step 2', Task: 'Task 2', Value: '20' },
    { Phase: 'Phase 2', Step: 'Step 1', Task: 'Task 1', Value: '25' },
    { Phase: 'Phase 2', Step: 'Step 2', Task: 'Task 2', Value: '40' },
    { Phase: 'Phase 2', Step: 'Step 1', Task: 'Task 2', Value: '30' },
    { Phase: 'Phase 1', Step: 'Step 1', Task: 'Task 2', Value: '10' }
  ]

Output:

  [
    { Phase: "Phase 1", Value: 50 },
    { Phase: "Phase 2", Value: 130 }
  ]

Solutions

• Solution #1