Update a field based on indexing

a!localVariables(
  local!Y: {
    a!map(id: 1, name: "test5"),
    a!map(id: 4, name: "test6")
  },
  local!X: {
    a!map(id: 1, name: "test1"),
    a!map(id: 2, name: "test2"),
    a!map(id: 3, name: "test3"),
    a!map(id: 4, name: "test4")
  },
  a!update(
    local!X,
    wherecontains(local!Y.id, local!X.id),
    local!Y
  )
)

-------------------------------------------------------------

a!localVariables(
  local!Y: {
    a!map(id: 1, name: "test7"),
    a!map(id: 4, name: "test8")
  },
  local!X: {
    a!map(id: 1, name: "test1"),
    a!map(id: 2, name: "test2"),
    a!map(id: 3, name: "test3"),
    a!map(id: 4, name: "test4")
  },
  a!update(
    local!X,
    "name",
    a!update(
      local!X.name,
      wherecontains(local!Y.id, local!X.id),
      local!Y.name
    )
  )
)

It can be achieved multiple ways. use Wherecontains() to index based on id

thanks for the reply, is there a way , I can do this inside a button. my requirement is upon button click , I need to update.

you can use the same what Venkat has mentioned in the buttons saveInto parameter.

a!save(target: local!data,value: a!update()) 

you can use the same what Venkat has mentioned in the buttons saveInto parameter.

a!save(target: local!data,value: a!update()) 

tried this, but local!data lost rows with id 2 and id 4, because we are saving only two updated rows into this variable)