Lua中..和#运算符的使用总结

Lua中..和#运算符

运算符	描述	例子
..	连接两个字符串	a..b,如果a是“hello”，b是“world”，则连接起来是“helloworld”
#	一元运算符返回一个字符串或者一个表的长度	#“hello” 返回的是5

简单例程：

1运算符： ..

tab1 = { key1 = "val1", key2 = "val2", "val3" }
for k, v in pairs(tab1) do
    print(k .. " - " .. v)
end

输出结果：
 

1 - val3
key1 - val1
key2 - val2
>Exit code: 0

2 运算符：#

a = "Hello "
b = "World"
print("Concatenation of string a with b is ", a..b )
print("Length of b is ",#b )
print("Length of b is ",#"Test" )

运算结果：

Concatenation of string a with b is  Hello World
Length of b is  5
Length of b is  4