Adding and Reading Elements

You already grow and shrink Lua tables with table.insert and table.remove: both work exactly the same on typed arrays. The difference is that Luau now checks what you insert: pushing a string into a {number} array is flagged while you type, not discovered by a confused player at runtime.

local queue: {string} = {"save", "load"}
table.insert(queue, "quit")      -- append at the end
table.insert(queue, 1, "help")   -- insert at position 1, shifting the rest
local last = table.remove(queue) -- removes AND returns the last element

table.remove(t) takes the last element out and hands it back to you; table.remove(t, 1) removes the first one and shifts everything down. Because the array is typed {string}, Luau knows the returned value is a string.

Reading is just as forgiving as plain Lua: an index that holds nothing, queue[0], queue[-1], or anything past #queue, quietly evaluates to nil. No error is raised, so check for nil before using a value you're not sure exists.