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On 07/08/16 05:55 AM, Dirk Laurie wrote:

2016-08-07 6:58 GMT+02:00 Tim Hill <drtimhill@gmail.com>:


table.len = function(t) return #t end

But

table.frontier = function(t)
    local mt = getmetatable(t)
    local len = #setmetatable(t)
    setmetatable(t,mt)
    return len
end

is less trivial, and sufficiently cumbersome to jusitfy implementation
at a lower level.


How about

table.len = function(t)
assert(type(t) == "table", "bad argument #1 to 'len' (table expected, got "..type(t)..")") 
  return #t
end

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