How to get objects from array of objects whose property "name" contains similar value in JavaScript

UIAPPDEVELOPER
March 8, 2024
142 views
3 votes
3 Answers

I have an array of object,I need to get those objects only whose property "name" having similar value.I have provided the expected output also.Here is the code below.

 <!DOCTYPE html>
    <html>
    <body>
    <h2>JavaScript</h2>
    <script>
    const value = 

    [
        {
            "id": 2,
            "name": "Pumpkin"
        },
        {
            "id": 1,
            "name": "Ladies Finger"
        },
        {
            "id": 4,
            "name": "Spinach"
        },
        {
            "id": 5,
            "name": "Spinach"
        }
    ]
    console.log("get same value property")
   /*Expected output 
[
    {
        "id": 4,
        "name": "Spinach"
    },
    {
        "id": 5,
        "name": "Spinach"
    }
]
*/
</script>
</body>
</html>

Tags: javascript

Answers

const arr = [{
    "id": 2,
    "name": "Pumpkin"
  },
  {
    "id": 1,
    "name": "Ladies Finger"
  },
  {
    "id": 4,
    "name": "Spinach"
  },
  {
    "id": 5,
    "name": "Spinach"
  }
]

const tmp = arr.reduce((acc, item) => {
  if (acc[item.name])
    acc[item.name].push(item)
  else
    acc[item.name] = [item]

  return acc
}, {})

const result = Object.values(tmp).filter(i => i.length > 1).flat()
console.log(result)

You can iterate over array once to create the key value pairs to store the occurence of the elements. And then use this key value pair to filter out the array elements using filter function. Something like this

const dataKeyMaps = value.reduce((vl, e) => {
  vl[e.name] = ++vl[e.name] || 0;
  return vl;
}, {});
const duplicateObjects = value.filter(x => dataKeyMaps[x.name]);

const value = [{
    "id": 2,
    "name": "Pumpkin"
  },
  {
    "id": 1,
    "name": "Ladies Finger"
  },
  {
    "id": 4,
    "name": "Spinach"
  },
  {
    "id": 5,
    "name": "Spinach"
  }
]

const dataKeyMaps = value.reduce((vl, e) => {
  vl[e.name] = ++vl[e.name] || 0;
  return vl;
}, {});
const duplicateObjects = value.filter(x => dataKeyMaps[x.name]);
console.log(duplicateObjects)

Good question!
https://jsfiddle.net/coder039/3fu87h6j/1/

const propertyCounter = () => {
  const data = {}
  return {
    add(item) {
      if (data.hasOwnProperty(item)) {
        data[item] = data[item] + 1
      } else {
        data[item] = 1
      }
    },
    get(item) {
      return data[item]
    },
    getData() {
      return data
    },
  }
}

const arr = [{
    id: 2,
    name: "Pumpkin",
  },
  {
    id: 1,
    name: "Ladies Finger",
  },
  {
    id: 4,
    name: "Spinach",
  },
  {
    id: 5,
    name: "Spinach",
  },
]
const counter = propertyCounter()
arr.forEach((item) => {
  counter.add(item.name)
})

const result = arr.filter((obj) => counter.getData()[obj.name] >= 2)
console.log(result)
document.write(JSON.stringify(result))

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