snoopyxdy的博客

https://github.com/DoubleSpout

日志

关于我

snoopyxdy

专注互联网技术

文章分类

LOFTER精选

八招诀窍，教你实力撩妹 >

网易考拉推荐

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

下载LOFTER 我的照片书 |

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()

评论这张

转发至微博

阅读(93)| 评论(0)

推荐转载

历史上的今天

在LOFTER的更多文章

this.p={  m:2,
              b:2,
              loftPermalink:'',
              id:'fks_087075092084086064081082087068072080081066085081082071084',
              blogTitle:'lua字符串拼接优化',
              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\>',
              blogTag:'sting,sting连接效率',
              blogUrl:'blog/static/60117440201722010725512',
              isPublished:1,
              istop:false,
              type:0,
              modifyTime:0,
              publishTime:1489975645512,
              permalink:'blog/static/60117440201722010725512',
              commentCount:0,
              mainCommentCount:0,
              recommendCount:0,
              bsrk:-100,
              publisherId:0,
              recomBlogHome:false,
              currentRecomBlog:false,
              attachmentsFileIds:[],
              vote:{},
              groupInfo:{},
              friendstatus:'none',
              followstatus:'unFollow',
              pubSucc:'',
              visitorProvince:'',
              visitorCity:'',
              visitorNewUser:false,
              postAddInfo:{},
              mset:'000',
              mcon:'',
              srk:-100,
              remindgoodnightblog:false,
              isBlackVisitor:false,
              isShowYodaoAd:false,
              hostIntro:'专注互联网技术',
              hmcon:'1',
              selfRecomBlogCount:'0',
              lofter_single:'<iframe width="140" height="560" style="overflow:hidden;" src="http://www.lofter.com/mailEntry.do?blogad=1&blog" frameBorder="0"></iframe>'
            }

{list a as x}
    {if !!x}
    <div class="iblock nbw-fce nbw-f40">
      <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.visitorName}/">
      {if x.visitorName==visitor.userName}
      <img alt="${x.visitorNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.visitorName)}&r=${visitor.imageUpdateTime}"/>
      {else}
      <img alt="${x.visitorNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.visitorName)}"/>
      {/if}
      </a>
      <div class="cwd vname thide">
        {if x.moveFrom=='wap'}
          <a class="noul pnt" target="_blank" href="http://blog.163.com/services/wapblog.html?frompersonalbloghome"><span title="来自网易手机博客" class="iblock wapIcon"> </span></a>
        {elseif x.moveFrom=='iphone'}
          <a class="noul pnt" target="_blank"><span title="来自iPhone客户端" class="iblock iphoneIcon"> </span></a>
        {elseif x.moveFrom=='android'}
          <a class="noul pnt" target="_blank"><span title="来自Android客户端" class="iblock androidIcon"> </span></a>
        {elseif x.moveFrom=='mobile'}
          <a class="noul pnt" target="_blank" href="http://blog.163.com/services/emsblog.html?frompersonalbloghome"><span title="来自网易短信写博" class="iblock wapIcon"> </span></a>
        {/if}
        <a class="fc03 m2a"  target="_blank" hidefocus="true" href="http://blog.163.com/${x.visitorName}/">
          ${fn(x.visitorNickname,8)|escape}
        </a>
      </div>
    </div>
    {/if}
    {/list}

<#--最新日志，群博日志--> <#--推荐日志-->

<p class="fc06">推荐过这篇日志的人：</p>
    <div>
      {list a as x}
      {if !!x}
      <div class="iblock nbw-fce nbw-f40">
        <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.recommenderName}/">
        <img alt="${x.recommenderNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.recommenderName)}"/>
        </a>
        <div class="cwd thide">
          <a class="fc03 m2a" target="_blank" hidefocus="true" href="http://blog.163.com/${x.recommenderName}/">
            ${fn(x.recommenderNickname,6)|escape}
          </a>
        </div>
      </div>
      {/if}
      {/list}
    </div>
    {if !!b&&b.length>0}
    <p  class="fc06">他们还推荐了：</p>
    <ul>
    {list b as y}
      {if !!y}
        <li class="rrb"><span class="iblock">·</span><a class="fc03 m2a" target="_blank" href="http://blog.163.com/${y.recommendBlogPermalink}/?from=blog/static/60117440201722010725512">${y.recommendBlogTitle|escape}</a></li>
      {/if}
    {/list}
    </ul>
    {/if}

<#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇，下一篇--> <#-- 热度 -->

{list a as x}
    {if !!x}
    <div class="hotItem iblock nbw-fce nbw-f40">
      <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/">
      {if x.publisherUsername==visitor.userName}
      <img alt="${x.publisherNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.publisherUsername)}&r=${visitor.imageUpdateTime}"/>
      {else}
      <img alt="${x.publisherNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.publisherUsername)}"/>
      {/if}
      </a>
      <div class="cwd vname thide">
        <a class="fc03 m2a"  target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/">
          ${fn(x.publisherNickname,8)|escape}
        </a>
      </div>
      <a class="f-myLikeIcons hottype {if x.type==1} js-liketype{elseif x.type==2} js-reblogtype{elseif x.type==3} js-sharetype{else}{/if}" target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/"> </a>
    </div>
    {/if}
    {/list}

<#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->

页脚

我的照片书 - 博客风格 - 手机博客 - 下载LOFTER APP - 订阅此博客

snoopyxdy的博客

导航

日志

lua字符串拼接优化

历史上的今天

最近读者

热度

在LOFTER的更多文章

评论

页脚