Types and values of LUA learning

Lua is a dynamic language that has no type-defined syntax in the language.

There are 8 basic types in Lua:

1.nil (empty)

2.boolean

3.number (digital)

4.string (String)

5.userdata (custom type)

6.function (function)

7.thread (thread)

8.table (table)

The function type can return the name of a type based on a value.

Print (type("HelloWorld"------------->string

Since there are no predefined types of variables,

Ten ; Print (type--------------------->numberprint;        -- ----------------------> Note This is legal. Print (type----------------------->function

Here we focus on the string type.

LUA strings are immutable values, and if modified can only create a new string:

"  One "  string.gsub(A,"One","One"); Print (a); -- ------------>one Print (b); -- ------------>two

LUA's strings, like other Lua objects, are objects managed by the automatic memory management mechanism.

You can also use a pair of matching brackets to define an alphabetic string so that you can extend multiple lines, but Lua does not interpret the escape characters.

Such as:

[[]] write (page);

LUA provides run-time numeric and string auto-conversions.

Print ("+"+1------------------>21print("  Hello"+2); -- --------------> Errors

In contrast, LUA can also convert a string into a number

Print (a); -- ---------------->1020

In Lua: Represents a string connection operator.

Types and values of LUA learning