How can I remove objects with duplicate property values while consolidating the values of another property?

Question

*Not the same as the flagged question. I don't just want to delete the duplicates; I want to consolidate the values of another property of the object to be removed.

For the following object:

orderedGroups: [ { parent: 'Components', subgroups: [ 'alphaselector' ] },
  { parent: 'Utilities', subgroups: [ 'colors' ] },
  { parent: 'Test Group', subgroups: [ 'component-test-alpha' ] },
  { parent: 'Document', subgroups: [ 'fixedtableheaders' ] },
  { parent: 'Utilities', subgroups: [ 'svgicons' ] },
  { parent: 'Utilities', subgroups: [ 'typography' ] } ]

How can I remove objects with duplicate parent entries while consolidating the corresponding subgroups?

Desired output:

orderedGroups: [ { parent: 'Components', subgroups: [ 'alphaselector' ] },
  { parent: 'Utilities', subgroups: [ 'colors', 'svgicons', 'typography' ] },
  { parent: 'Test Group', subgroups: [ 'component-test-alpha' ] },
  { parent: 'Document', subgroups: [ 'fixedtableheaders' ] } ]

What I have so far/where I'm stuck:

for (let val of Object.values(orderedGroups)) {

  if (orderedGroups.hasOwnProperty(val.parent)) {
    // remove duplicate objects and consolidate corresponding subgroups 
  }

}

*Note: I cannot import modules; must be plain js.

jimboweb · Accepted Answer · 2019-08-28 17:16:47Z

2

Dominic has a more elegant solution, but here's a simpler solution that might be easier for some to understand.

let output = [];

for(group of orderedGroups){
  let i;
  for(i=0;i<output.length;i++){
    if(output[i].parent===group.parent) break;
  }
  if(i===output.length){
    output.push(group);
  } else {
    output[i].subgroups=output[i].subgroups.concat(group.subgroups);
  }
}

answered Aug 28, 2019 at 17:16

jimboweb

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Comments

Dominik Matis · Accepted Answer · 2019-08-28 17:03:40Z

You can use Map to store subgroups by key (in this case parent) and then only use for loop to add them to orderedGroups as you wish.

let orderedGroups = [ { parent: 'Components', subgroups: [ 'alphaselector' ] },
  { parent: 'Utilities', subgroups: [ 'colors' ] },
  { parent: 'Test Group', subgroups: [ 'component-test-alpha' ] },
  { parent: 'Document', subgroups: [ 'fixedtableheaders' ] },
  { parent: 'Utilities', subgroups: [ 'svgicons' ] },
  { parent: 'Utilities', subgroups: [ 'typography' ] } ]
  
let tmp = new Map()
for(let obj of orderedGroups) {
  if(tmp.has(obj.parent)) tmp.set(obj.parent, [...tmp.get(obj.parent), ...obj.subgroups])
  else tmp.set(obj.parent, [...obj.subgroups])
}
orderedGroups = [] 
for(let obj of tmp) {
  orderedGroups = [...orderedGroups, {parent: obj[0], subgroups: obj[1]}]
}
console.log(orderedGroups)

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