remove duplicates from multidimensional json array javascript-CodePudding

Trying to remove duplicate object from arrays so that set of array contain only unique values. given input

var data=[
[{"name":"abc"}],
[{"name":"abc"}],
[{"name":"abc"},{"name":"def"}],
[{"name":"def"},{"name":"abc"},{"name":"efg"}],
[{"name":"abc"}]
]

expected output

result= [
[{"name":"abc"}],
[],
[{"name":"def"}],
[{"name":"def"},{"name":"efg"}],
[]
]

trying to de-duplicate object from all array(exists in all). object comparison rather than name attribute Any suggestions for logic here

CodePudding user response：

You can try to map the top level array and filter each array of item. Then you can declare a variable that will hold the unqiue values so that you have a basis for the checking.

const data = [
  // your multi-dimentional array here...
]

const unique = []
const filteredData = data.map(items => {
  const filteredItems = items.filter(item => {
    if (unique.includes(item.name)) {
       return false
    } else {
       unique.push(item.name)
       return true
    }
   })
  
  return filteredItems
})

console.log(filteredData)

CodePudding user response：

...more clunky stuff :

var data=[
[{"name":"abc"}],
[{"name":"abc"}],
[{"name":"abc"},{"name":"def"}],
[{"name":"def"},{"name":"abc"},{"name":"efg"}],
[{"name":"abc"}]
];

let newMap = new Map();

for(let item in data) {
  const [key, val] = [item, data[item]]
  addToMap(val)
}

function addToMap(entry) {
  if(entry.length > 1) {
    for(let item in entry) {
      addToMap([entry[item]])
    }
  } else {
    const item = entry[0];
    itemName = item?.name;
    console.log({item, itemName});
    
    if(!!itemName && !newMap.has(itemName)) {
      const key = itemName;
      const val = item;
      newMap.set(key, val);
    }
  }
}

let result = Array.from(newMap).flat()
.map(key => newMap.get(key) || [])
// .map(key => newMap.get(key) || null)
// .filter(item => item !== null)

console.log('RESULT ', result)