Timeline for How to merge two arrays in JavaScript and de-duplicate items
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Jun 8, 2021 at 13:48 | comment | added | dekisha | This creates object instead of array | |
| May 26, 2021 at 11:12 | history | edited | Roman Nazarevych | CC BY-SA 4.0 |
It doest concatenate arrays but add new array as last element of `array1`
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| May 26, 2021 at 11:07 | comment | added | Roman Nazarevych |
array1.push(...array2) // => don't remove duplication it doest concatenate arrays but add new array as last element of array1
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| Nov 14, 2019 at 1:32 | comment | added | Rakibul Haq | for merging different objects without duplicating : stackoverflow.com/a/54134237/3131433 | |
| Sep 16, 2019 at 10:55 | comment | added | x-magix | this is really the best answer, I tried to compare with array.find by id, array concact and wasnt fast like yours solution, best man thank you | |
| Mar 7, 2019 at 19:12 | comment | added | W Biggs | Does not work with an array of objects, as it'll only merge object references and doesn't care if the objects themselves are equal. | |
| Mar 14, 2018 at 9:21 | comment | added | Thanh Nguyen | should be accepted answer for the modern of Javascript. | |
| Jan 5, 2018 at 2:16 | comment | added | Jun | Note that for set can't deduplicate two objects that have the same key value pairs unless they are the same object references. | |
| Nov 17, 2016 at 3:21 | history | edited | Abdennour TOUMI | CC BY-SA 3.0 |
deleted 12 characters in body
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| Oct 19, 2016 at 14:45 | comment | added | David Noreña | so how you would do it ? | |
| Oct 10, 2016 at 10:13 | comment | added | user6445533 |
1st/2nd example is no union at all + 1st example blows up the stack for large Arrays + 3rd example is incredibly slow and consumes a lot of memory, since two intermediate Arrays have to be build + 3rd example can only be used for union with a known number of Arrays at compile time.
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| Aug 14, 2016 at 8:14 | history | edited | Abdennour TOUMI | CC BY-SA 3.0 |
added 70 characters in body
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| Aug 14, 2016 at 8:08 | history | answered | Abdennour TOUMI | CC BY-SA 3.0 |