Re: I very confuse of tabe, only the 3rd can be skiped.

[Thijs Schreijer <thijs@...>]

On 27 Jun 2016, at 09:23, GHui <ugiwgh@qq.com> wrote:

I very confuse of tabe, only the 3rd can be skiped. 

The test as following:

> d={}

> d[1]=1

> d[2]=2

> d[3]=3

> d[5]=5

> print(#d)

3

> a={}

> a[1]=1

> a[3]=3

> print(#a)

1

> b={}

> b[1]=1

> b[2]=2

> b[4]=4

> print(#b)

4

In Lua there is no native array type. To use them you use a table, but it’s up to you to make sure that all entries have a value. So in your examples you created tables with ‘holes’ in them, and then the length operator # has an “undefined” result (as you noticed).

see https://www.lua.org/manual/5.1/manual.html#2.5.5

hth

Thijs