Fill operator

[K4rakara]

A nice feature to have would be JavaScripts fill operator:

const object1 = { foo: "Hello", bar: "World" } // { foo: "Hello", bar: "World" }
const object2 = { ...object1, bar: "Universe" } // { foo: "Hello", bar: "Universe" }

Now, ... in lua is an operator(?) that copies variable arguments, if they exist.

So, something else would have to be used; heres a few options:

• ,,, table1:
  • pros: Simple, close to what you would type for ....
  • cons: Looks weird
• .. table1: Could be used if it is only allowed in situations where there is nothing before the .. operator except for { or ,.
  • pros: Simple, similar to something Lua would do, close to what you would type for ....
  • cons: might clash with the concat operator if not implemented right.

As far as what this could compile to, its fairly simple:

table1 = { foo: "Hello", bar: "World" }
table2 = { ..table1, bar: "Universe" }

Becomes:

table1 = { foo = "Hello", bar = "World" }
table2 = { table.unpack(table1), bar = "Universe" }

[tommy-mor]

i would like this