Lua——table

通过给出一个key来获得对应的value。并且，table的key可以是除nil以外的任意类型

local tab = {}
tab.a = 1
tab["hello"] = "world"
tab["f"] = function()
    print("c is function")
end
for k, v in pairs(tab) do
    print(string.format("key=%s,value=%s", tostring(k), tostring(v)))
end

concat

concat是concatenate(连锁, 连接)的缩写. table.concat()函数列出参数中指定table的数组部分从start位置到end位置的所有元素, 元素间以指定的分隔符(sep)隔开。

fruits ={"banana","apple","origin"}
print(table.concat(fruits))
print(table.concat(fruits,","))

输出结果

bananaappleorigin
banana,apple,origin

制定索引连接table

fruits ={"banana","apple","origin"}
print(table.concat(fruits,",",2,3))

输出结果

apple,origin

insert

插入数据

fruits ={"banana","apple","origin"}
table.insert(fruits,"mango")
print(table.concat(fruits,","))

打印结果

banana,apple,origin,mango

在索引2 插入数据

fruits ={"banana","apple","origin"}
table.insert(fruits,2,"mango")
print(table.concat(fruits,","))

输出结果

banana,mango,apple,origin

remove

fruits ={"banana","apple","origin"}
table.remove(fruits)
print(table.concat(fruits,","))

输出结果

banana,apple

遍历

ipairs

myTable ={1,a=2,"hello",b="world"}
for k,v in ipairs(myTable)do
    print(k,v)
end

输出结果

1       1
2       hello

pairs

myTable ={1,a=2,"hello",b="world"}
for k,v in pairs(myTable)do
    print(k,v)
end

输出结果

1       1
2       hello
a       2
b       world

数组形式还可以用和c语言类似的方式

letters = { "a", "b", "c" }
for k = 1, #letters do
    print(k, letters[k])
end