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adding and changing data of array elements

Ability to change the data of an array element whitout deleting the current data stored in that element.

For example if a dispenser would have this data:

{Items: [{Slot: 0b, id: "minecraft:diamond_sword", Count: 1b}], Lock: ""}

Then you could add this data:

{tag:{display:{Lore:["This is line 1", "and this is line 2]"}}}

to the Element 0 of the array "Items" and the new data would look like this:

{Items: [{Slot: 0b, id: "minecraft:diamond_sword", Count: 1b, tag:{display:{Lore:["This is line 1", "and this is line 2]"}}}], Lock: ""}

Also, a new Element could be added to the end of an array.

This could be done with /data add wich would work a bit simillar to /data remove:

/data add <block/entity> <coordinates/selector> <path to array> <nbt>

In the array path, you coulod also use Array[#] to acces the end of the array

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    Registered User commented
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    I'm pretty positive that all you mentioned can already be done with the /data command.

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    Registered User commented
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    @Pe brito you can only overwrite the entire array and not add or modify elements with the data merge command.

    Tested in 1.13.1.