大家好，又见面了，我是全栈君，今天给大家准备了Idea注册码。
值来作数组的索引
，但这个值不能是 nil。同样，在
C语言中，数组的内容只允许一种类型；在 Lua中，你也可以用任意类型的值来作数组的内容，nil也可以。
第一，所有元素之间，总是用逗号 “，” 隔开；
第二，所有索引值都需要用 “[“和”]” 括起来；如果是字符串，还可以去掉引号和中括号； 即如果没有[]括起，则认为是字符串索引
第三，如果不写索引，则索引就会被认为是数字，并按顺序自动从 1往后编；
=
{“hello”
,33
}
= 4
=
{[tt
]
= “table”
,key
= value
,
[“flag”
]
=
nil
, 11
}
(tab
[tt
])
(tab.key
)
(tab
[1
])
变量（包括字符串），都可以[variable]=value的方式
只要a==b那么tab[a]可以访问到tab[b]的值
索引key是常量，不会随变量的改变而变化该value的key
=
{tb12
=
{bool
=
true
}} — simple, it’s a table IN a table :)
(tb11.tb12.bool
) — works fine, since it’s calling the key and value correctly.
(tab11
[“tb12”
].bool
) –same as line 33
(tab11.tb12
[“bool”
]) –same as line 33
(tab11
[“tb12”
][“bool”
]) –same as line 33
=
{john
=“chips”
,jane
=“lemonade”
,jolene
=“egg salad”
}
= “fruit salad” –changed the value to “fruit salad” instead of “egg salad”
= “fagaso food” — adding a new key-value pair to the container lucky.
=
nil — remove john from giving anything or from being a key.
=
{}; b
= a
;
(a
== b
) –> true
,d
=
{},{};
(c
== d
) –>false
1. table.sort (table [, comp])
Sorts table elements in a given order, in-place, from table[1] to table[n], where n is the length of the table. If comp is given, then it must be a function that receives two table elements, and returns true when the first is less than the second (so that not comp(a[i+1],a[i]) will be true after the sort). If comp is not given, then the standard Lua operator < is used instead.
The sort algorithm is not stable; that is, elements considered equal by the given order may have their relative positions changed by the sort.
=
{“you”
,“me”
, “him”
,“bill”
}
(name
)
, v
in
ipairs
( name
)
do
( k
,v
)
( a
, b
)
if
string.sub
(a
,2
,2
)
<
string.sub
(b
,2
,2
)
then
return
true
else
return
false
end
(name
, cmp
)
, v
in
ipairs
( name
)
do
( k
,v
)
2. table.insert (table, [pos,] value)
value at position pos in table, shifting up other elements to open space, if necessary. The default value for pos is n+1, where n is the length of the table so that a call table.insert(t,x) inserts x at the end of table t.
=
{“a”
,“c”
, “d”
}
=
{}
(
table
)
for i
=1
,#
table
do
(i
,
table
[i
])
end
(“before insert:”
)
(foo
)
(foo
,2
,“b”
)
(“after insert”
)
(foo
)
3. table.concat (table [, sep [, i [, j]]])
Given an array where all elements are strings or numbers, returns table[i]..sep..table[i+1] ··· sep..table[j]. The default value for sep is the empty string, the default for i is 1, and the default for j is the length of the table. If i is greater than j, returns the empty string.
=
{1
,2
, 3
,4
,5
,6
}
(
table.concat
(num
,“<”
))
4. table.remove (table [, pos])
Removes from table the element at position pos, shifting down other elements to close the space, if necessary. Returns the value of the removed element. The default value for pos is n, where n is the length of the table, so that a call table.remove(t) removes the last element of table t.
(
table.remove
(abc
,2
))
(“abc length = ”
..
#abc
)
5. table.maxn (table)
Returns the largest positive numerical index of the given table, or zero if the table has no positive numerical indices. (To do its job this function does a linear traversal of the whole table.)
(table.maxn
(apple
)) — 5
=
{[-2
]=3
,[- 1
]=0
}
(table.maxn
(duck
)) — 0
–note: the more closures made, the slower the program would run.
local
function get
()
return n
;
end
local
function inc
(m
)
= n
+m
;
end
return
{get
= get
, inc
= inc
}
= mg1
(50
)
(object.get
())
(object
[“get”
]())
(2
)
(object.get
())
local
function get
(o
)
return o.one
end
local
function inc
(self
, two
)
= self.one
+ two
end
function mg3
(one
)
return
{one
= one
, get
= get
, inc
= inc
}
end
= mg3
(50
)
:get
()
(a
,2
)
(a
:get
())
local T
=
{};
function T
:get
()
return self.n
;
end
function T
:inc
(m
)
= self.n
+ m
;
end
function mg4
( n
)
return
{n
= n
, get
=T.get
, inc
=T.inc
}
end
= mg4
(30
)
(c
:get
())
:inc
(4
)
(c
:get
())
发布者：全栈程序员-用户IM，转载请注明出处：https://javaforall.cn/120420.html原文链接：https://javaforall.cn
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