Java Edition 17w45b

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 "field": "[https://piston-data.mojang.com/v1/objects/83e5c3728b473a8d5afda12906a3e581888489fd/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/f9acb09376005f47f647ebb8bc687e5ba9e515ec/17w45b.json .json])<br />[https://piston-data.mojang.com/v1/objects/eec0c6c49b1066b648f39e1dcef8c76510a794dc/server.jar Server]",
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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17w45b is the fourth snapshot for Java Edition 1.13, released on November 10, 2017,^[1] which added the /data command.

/data

• A command that allows the player to get, merge, and remove entity and block NBT data.
  • /data get block <pos> [<path>] [<scale>]
    • Returns the NBT data from the block at <pos> as its result (if a [<path>] is specified). A [<path>] can be specified to only retrieve that NBT data, but this is limited to numeric tags. An optional [<scale>] can be provided to scale the number retrieved.
  • /data get entity <target> [<path>] [<scale>]
    • Returns the NBT data from one [<target>] entity as its result (if a [<path>] is specified). A [<path>] can be specified to only retrieve that NBT data, but this is limited to numeric tags. An optional [<scale>] can be provided to scale the number retrieved.
  • /data merge block <pos> <nbt>
    • Merges the block NBT data at <pos> with the specified <nbt> data.
  • /data merge entity <target> <nbt>
    • Merges the entity NBT data from <target> with the specified <nbt> data. Merging player NBT data is not allowed.
  • /data remove block <pos> <path>
    • Removes NBT data at <path> from the block at <pos>.
  • /data remove entity <target> <path>
    • Removes NBT data at <path> from one <target> entity. Removing player NBT data is not allowed.
  • Data paths look like this: foo.bar[0]."A [crazy name]".baz.
    • foo.bar means foo's child called bar.
    • foo[0] means element 0 of foo.
    • "quoted strings" may be used if a name of a key needs to be escaped.
  • Examples of old commands:
    • /entitydata <target> {} is now /data get entity <target>
    • /blockdata <pos> <nbt> is now /data merge block <pos> <nbt>
  • Examples of new functionalities:
    • /data get entity @e[type=pig,limit=1] Saddle 2
    • /data remove block 17 45 34 Items

/entitydata

• Has been removed in favor of /data.

/execute store

• Has been reworked.
  • /execute store (result|success) score <name> <objective> <chained command>
    • The value is stored into the scoreboard under <name> and <objective>.
    • The objective must exist, but unlike with /stats you don't need to set an initial value for <name>.
  • /execute store (result|success) block <pos> <path> (byte|double|float|int|long|short) <scale> <chained command>
    • The value is stored in the NBT data at path of the block at pos as a byte, double, float, int, long, or short.
  • /execute store (result|success) entity <target> <path> (byte|double|float|int|long|short) <scale> <chained command>
    • The value is stored in the NBT data at path of one target entity as a byte, double, float, int, long, or short.
  • Data paths look like this: foo.bar[0]."A [crazy name]".baz.
    • foo.bar means foo's child called bar.
    • foo[0] means element 0 of foo.
    • "quoted strings" may be used if a name of a key needs to be escaped.
  • Examples:
    • /execute store success score @a foo run say hi
    • /execute as @e[type=pig] at @s store success entity @s Saddle byte 1 if entity @p[distance=..5]

/execute if <...>

• Now returns success and result values if used on its own, without a sub-command.

27 issues fixed

From released versions before 1.13

• MC-80400 – Sizelimited entity selectors (@e with c=1,@r with type=!entity) in commands prefer players.
• MC-87799 – /execute detect functions inconsistently with semi- (snow layer, grass path, soul sand, farmland) blocks.
• MC-98244 – Same UUID infinite times possible + changing UUID possible via entitydata.
• MC-106681 – Scoreboard teams leave doesn't work if first player fails.
• MC-111704 – Players can input any value in [old block handling] of setblock and fill.
• MC-114721 – Title command treats invalid second argument as "title".
• MC-117933 – /clone command treats invalid optional arguments as if they were default.

From the previous development version

• MC-121623 – Cannot use namespace in type= for selectors.
• MC-121627 – @s fails to build valid commands.
• MC-121635 – Incorrect failed /fill result message.
• MC-121637 – Incorrect result message when teleporting a single entity.
• MC-121642 – "Optional" commands following conditional execute chain succeed/fail strangely.
• MC-121647 – JRE Fatal Error when joining multi-player server.
• MC-121655 – Incorrect message when teleporting single entity.
• MC-121656 – Some creative commands are available by a survival player with cheats disabled.
• MC-121660 – distance argument can't find players with @a, @p or @e[type=player].
• MC-121663 – Gamerules are copying from other worlds.
• MC-121674 – Execute doesn't work in functions.
• MC-121683 – -= isn't a valid operation in scoreboard players operation.
• MC-121686 – Execute unless always fails on entities.
• MC-121695 – Tellraw only supports 1 target.
• MC-121711 – @a or @s doesn't include dead player.
• MC-121726 – Only players can teleport with relative coordinates.
• MC-121727 – Execute on multiple entities cancels, once one command fails.
• MC-121728 – The order, in which execute runs the command for each entity, is in reverse.
• MC-121749 – /entitydata does not apply modified NBT data.
• MC-121765 – Removing n scoreboard points adds them instead.