Lua learning notes --- annotations, variables, strings, and lua learning notes

Lua learning notes --- annotations, variables, strings, and lua learning notes

1. Notes

Single line comment "--" equivalent "//"

Multi-line comment "-- []" is equivalent /**/

Escape nested comments -- [= [] =]

The number of = is not limited, but the number must be equal.

2. Variables

Keyword retention

If

Else

Elseif

Then

End

For

Break

Do

Nil (null)

Local

Function

While

In

And

Or

False

True

Until

Lua variables include global variables and local variables.

All its global variables are stored in a common table,

The advantage of this organizational structure is that, first, there is no need to create a new data structure for global variables, which simplifies the internal implementation of Lua. Another advantage is that, you can operate on this table like other tables. To facilitate this operation, Lua saves the environment table itself in a global variable _ G.

The local declaration is used before the local variable.

Print can be used to display variables, numbers, and strings to terminals.

1> the string format can be single quotation mark ''or double quotation mark" ".

2> escape characters with Backslash "\"

Sometimes a string contains many single or double quotation marks. When using string double quotation marks, use escape characters. If the string content contains many single or double quotation marks, this is very troublesome.

For example, message = "James said," hello ", Li Hong raised his head and said" hello "";

In this case, the [[String] form is used to enclose such strings.

If you are not bothered, you can also use the Escape Character "\"

3> Number