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lua字符串拼接优化

2017-03-20 10:07:25| 分类： lua | 标签： |举报 |字号大中小订阅

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sting.format() 和字符串连接.. 究竟哪种效率更高呢？

我们看下代码


local x = 10000000	-- 1千万次

v = "111"
s = os.time()
for i=0,x,1 do
	z = string.format("%s %s %s",v,v,v)
end
print("111", os.time()-s)


s = os.time()
for i=0,x,1 do
	z = v..v..v
end
print("222", os.time()-s)



v = 111
s = os.time()
for i=0,x,1 do
	z = tostring(v)..tostring(v)..tostring(v)
end
print("333", os.time()-s)

运行结果：

111 5

222 1

333 20

总结一下，在明确是字符串类型时，使用 .. 效率更高，否则使用sting.format()

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              blogAbstract:'sting.format() 和 字符串连接.. 究竟哪种效率更高呢？<wbr\><div\>我们看下代码</div\><div\><div\><pre class=\"prettyprint\"   \><p\></p\><div\>local x = 10000000<span style=\"white-space:pre;\"   \>\t</span\>-- 1千万次</div\><div\><br\></div\><div\>v = \"111\"</div\><div\>s = os.time()</div\><div\>for i=0,x,1 do</div\><div\><span\>\t</span\>z = string.format(\"%s %s %s\",v,v,v)</div\><div\>end</div\><div\>print(\"111\", os.time()-s)</div\><div\><br\></div\><div\><br\></div\><div\>s = os.time()</div\><div\>for i=0,x,1 do</div\><div\><span\>\t</span\>z = v..v..v</div\><div\>end</div\><div\>print(\"222\", os.time()-s)</div\><div\><br\></div\><div\><br\></div\><div\><br\></div\><div\>v = 111</div\></pre\></div\></div\>',
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