Lodash Remove Duplicates from Array

Lodash remove duplicates from array

_.unique no longer works for the current version of Lodash as version 4.0.0 has this breaking change. The functionality of _.unique was splitted into _.uniq, _.sortedUniq, _.sortedUniqBy, and _.uniqBy.

You could use _.uniqBy like this:

_.uniqBy(data, function (e) {
  return e.id;
});

...or like this:

_.uniqBy(data, 'id');

Documentation: https://lodash.com/docs#uniqBy

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For older versions of Lodash (< 4.0.0 ):

Assuming that the data should be uniqued by each object's id property and your data is stored in data variable, you can use the _.unique() function like this:

_.unique(data, function (e) {
  return e.id;
});

Or simply like this:

_.uniq(data, 'id');

Remove same property value duplicate from array of objects using Lodash

Use _.uniqBy() the name property instead:

const values = [{"name":"A","age":12},{"name":"B","age":1},{"name":"A","age":31}]

const result = _.uniqBy(values, 'name')

console.log(result)

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Lodash remove duplicates from nested array

You can combine uniq and mapValues to achieve it.

let data = {
    "deviceA": {
        "serviceA": [
            "Foo",
            "Bar",
            "Foo Bar A",
            "Foo Bar A",
            "Foo Bar A"
        ],
        "serviceB": [
            "Foo",
            "Bar",
            "Foo Bar B",
            "Foo Bar B",
            "Foo Bar B"
        ]
    },
    "deviceB": {
        "serviceA": [
            "A",
            "A",
            "Foo Bar A",
        ],
        "serviceB": [
            "B",
            "B",
            "Foo Bar B",
        ]
    }
}

const items = _.mapValues(data, (device) => _.mapValues(device, (service) =>_.uniq(service)))
console.log(items)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>

Remove duplicate items in objects array with lodash.js

Make sure that you use proper namings, that code works for me:

    var arr = [
                {
                  label: 'tagA',
                  value: 1
                },
                {
                  label: 'tagB',
                  value: 2
                },
                {
                  label: 'tagC',
                  value: 3
                },
                {
                  label: 'tagB',
                  value: 4
                },
                {
                  label: 'tagB',
                  value: 5
                },
              ];

    var uniq = _.uniqBy(arr, function(o){
        return o.label;
    });

    console.log(uniq); // >> Returned an array with first 3 objects from array arr

Remove duplicate String(Ignore Case) from list in angular 8 using lodash

You can use _.uniqWith() with a callback as following:

let duplicates = ['Hello', 'Hi', 'hello'];
let uniques = _.uniqWith(duplicates, (a,b) => a.toLowerCase() === b.toLowerCase())
console.log(uniques);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

Angular 9 - Remove duplicates from array of objects

Should works fine

let finalMessages = [];
let prevTimestamp = null;
messages.forEach((message, index) => {
  if (moment(message.timestamp).isSame(moment(prevTimestamp), 'days')) {
    message.timestamp = null
  } else {
    prevTimestamp = message.timestamp
  }
  finalMessages.push(message)
})

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