`uniqBy` returns incorrect values #5951

vinaysharma14 · 2024-12-18T19:11:27Z

import _ from 'lodash';

const result = _.uniqBy(
    [
        { name: 'Foo' },
        { name: 'Foo' },
        { name: 'Bar' },
        { name: 'Bar' },
        { person: { name: 'Foo' } },
        { person: { name: 'Foo' } },
        { person: { name: 'Bar' } },
        { person: { name: 'Bar' } },
    ],
    'person.name',
);

// result
[
  { name: 'Foo' }, // it shouldn't be present
  { person: { name: 'Foo' } },
  { person: { name: 'Bar' } }
]

hamza-elmoudden · 2024-12-27T17:52:46Z

If you want to use _.uniqBy to ensure that duplicates are removed based on the person.name property only, you can add a condition to check if the object has a person property before manipulating the data.

import _ from "lodash"

const result = _.uniqBy(
[
{ name: 'Foo' },
{ name: 'Foo' },
{ name: 'Bar' },
{ name: 'Bar' },
{ person: { name: 'Foo' } },
{ person: { name: 'Foo' } },
{ person: { name: 'Bar' } },
{ person: { name: 'Bar' } },
].filter(item => item.person?.name),
(item) => item.person?.name
);

console.log(result);

Rangarajanl-OpenSource · 2024-12-29T19:09:05Z

@vinaysharma14 I personally see this as a potential core feature that could be extremely useful. If you agree, please consider reviewing and upvoting the issue: #5953.
I’ve made sure to update the ticket diligently with all relevant details. Feel free to add any further insights you think are necessary. If you're open to it, we could also collaborate on implementing this change together!

Adds a new uniqByExisting function that behaves like uniqBy but skips elements where the specified property path doesn't exist. This addresses issue lodash#5951 and partially implements the feature request in lodash#5953 for mixed data formats.

FMaxey3 · 2025-04-08T13:16:44Z

@eugenemaxey curl -o media3-migration.sh
#"https://raw.githubusercontent.com/google/ExoPlayer/r2.19.1/media/3-migration.sh"

Rangarajanl-OpenSource mentioned this issue Dec 29, 2024

Feature Request: Extend Lodash Methods to Support Mixed Data Formats (Flat and Nested) #5953

Open

vedant713 mentioned this issue Mar 5, 2025

Add uniqByExisting function to handle missing property paths #5972

Open

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`uniqBy` returns incorrect values #5951

`uniqBy` returns incorrect values #5951

uniqBy returns incorrect values #5951

uniqBy returns incorrect values #5951

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`uniqBy` returns incorrect values #5951

`uniqBy` returns incorrect values #5951