Luaのプログラミング例(4)。テーブルライブラリ、文字列ライブラリ、システムライブラリからなるLua標準ライブラリ

tb1 = { "alpha","log","gamme"}

print(table.concat(tb1," , "))
print(table.concat(tb1,"\n",nil,2))
print()

tb1[88.99] = 'aaa'
--returns the value with the largest index value and calculates the decimal
print(table.maxn(tb1))
print()

--deletes the element with the largest index by default and returns it
print(table.remove(tb1))
print()

table.insert(tb1,'3423')
table.sort(tb1)
print(table.concat(tb1," , "))
function sortFunc(a,b)
 return a>b
end
table.sort(tb1,sortFunc)
print(table.concat(tb1," , "))
print()

print(string.len(" "))
print(string.len("abcd"))
print(string.sub("welcome",1,3))
print(string.sub("welcome",1,-1))
print(string.sub("welcome",1,-5))
print()

print(os.date())
print()

do
 local x = os.clock()
 local s = 0
 for i=1,100000000 do s= s+i end
 print(string.format("the passed time is %.2f\n",os.clock()-x))
end

s = "hello world"
i, j = string.find(s, "hello")
print(i, j) --> 1 5
print(string.sub(s, i, j)) --> hello
print(string.find(s, "world")) --> 7 11
i, j = string.find(s, "l")
print(i, j) --> 3 3
print(string.find(s, "lll")) --> nil

s = string.gsub("Lua is super", "is","makes")
print(s)
s = string.gsub(s,"a","X")
print(s)
s = string.gsub(s,"X","a",1)
print(s)

alpha , log , gamme
alpha
log

88.99

gamme

3423 , alpha , log
log , alpha , 3423

0
4
wel
welcome
wel

11/24/11 17:55:44

the passed time is 2.12

1 5
hello
7 11
3 3
nil
Lua makes super
LuX mXkes super
Lua mXkes super