Both addAll and addEntries are methods used with maps, but they serve slightly different purposes:

• 𝙖𝙙𝙙𝘼𝙡𝙡:
  𝗨𝘀𝗮𝗴𝗲: addAll is used to add all key-value pairs from one map to another. It modifies the existing map.
  𝗔𝗿𝗴𝘂𝗺𝗲𝗻𝘁 𝗧𝘆𝗽𝗲: It takes a Map as an argument.
  𝗥𝗲𝘁𝘂𝗿𝗻 𝗧𝘆𝗽𝗲: void (it modifies the existing map).

• 𝙖𝙙𝙙𝙀𝙣𝙩𝙧𝙞𝙚𝙨:
  𝗨𝘀𝗮𝗴𝗲: addEntries is used to create a new map by adding entries from an iterable of MapEntry objects. It does not modify the existing map but creates a new one.
  𝗔𝗿𝗴𝘂𝗺𝗲𝗻𝘁 𝗧𝘆𝗽𝗲: It takes an Iterable> as an argument.
  𝗥𝗲𝘁𝘂𝗿𝗻 𝗧𝘆𝗽𝗲: Map (it returns a new map).

Choose between addAll and addEntries based on whether you want to modify an existing map or create a new one with additional entries. If you want to keep the original maps unchanged and create a new map, use addEntries. If you want to modify an existing map, use addAll.