lua-Operators(运算符)

Arthmetic Operators

Similiar to other programing languages, there are also + - * / % in Lua. On top of that, lua also has ^ (exponent) operator.

local a = 2
print(a ^ 1)    -- 2.0
print(a ^ 2)    -- 4.0
print(a ^ 3)    -- 8.0
print(a ^ 4)    -- 16.0

Relational Operators

This section is the same to other programing language.

Note: unequal operator is ~=

Logical Operators

This section has a great distinction from others.

NOTE:

Only nil or false will be recognized as false.

and

Similiar to other language &&

or

Similiar to other language ||

not

Similiar to other language !

Misc Operators

1. .. concatenation

   Concatenates two strings.

   local a, b = "hello", 'lua'
   local c = a .. "-" .. b
   print(c) -- hello-lua

2. # length

   An unary operator that return the length of the a string or a table.

   local a = "hello"
   local b = #a
   print(b) -- 5
   
   local t = {"hello","lua","python"}
   local c = #t
   print(c) -- 3