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JS array copy speed test 220320

2022-07-27 23:39:00 【kfepiza】

js Array copy speed test 220320

perform 600000 Time
use srcAr.concat() when 16 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use srcAr.slice() when 17 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use Array.from(srcAr) when 17 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use […srcAr] when 12 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use Object.assign([],srcAr) when 1985 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use JSON.parse(JSON.stringify(srcAr)) when 549 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
The second time srcAr.slice() when 16 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
The second time srcAr.concat() when 15 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use newAr=new Array(); for(let i=0;i43 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use newAr=new Array(); for(let i=0;i36 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use newAr=[]; for(let i=0;i32 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use newAr=[]; for(let i=0;i33 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use newAr=Array(srcAr.length); for(let i=0;i17 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
use newAr=new Array(srcAr.length); for(let i=0;i23 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
Use... For the third time srcAr.concat() when 9 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]
Use... For the third time srcAr.slice() when 14 millisecond
newAr=[0,1,2,3,4,5,6,7,8,9, Ten , 11、 ... and , Twelve , 13、 ... and , fourteen , 15、 ... and ]

Test code 

<!DOCTYPE html><html lang="zh-CN"><head><meta charset="utf-8"/><title></title><style>

#BodyH{
    display:flex; align-items:center; justify-content:center;}



</style><script>
const ge=window.dgebi=function(e,s){
    if(e&&e.constructor===String){
    let n=e;e=document.getElementById(e);e=e||document.querySelector(n);}if(e&&s){
    e.newE=e.newChild=s;e.appendChild(s);}return e;},
dcept=(p,tn="DIV")=>{
    let e=document.createElement(tn);e.idfine=(i)=>{
    e.id=i;return window[i]=e;};e.htm=(h)=>{
    e.innerHTML=h;return e;};dgebi(p,e);return e;} ;
if(!document.title.length)(function(){
    var str=document.URL; str=str.substring( str.lastIndexOf("/")+1 , str.length-5); str=decodeURI(str); document.title=str;})();
window.dwbr=function(a0=1){
    let ar=arguments,br=dwbr.br; if(Number.isFinite(a0)){
    br(a0);return;} for(let a of ar)document.write(a.replace(/\n/g,"<br/>"));br();}; dwbr.br=function(n=1){
    for(let c=0;c<n;c++)document.write("<br/>");};
window.childIdvar=function(q){
    for(let p of document.querySelectorAll(q))for(let c of p.children)if(c.id&&c.id.length>0)window[c.id]=c;};
</script><script>





</script></head><body style="margin:0; font-size:16px; "><header id="BodyH">

	<label style="font-size:3rem; "></label><script>{
    let s=document.currentScript; let l=s.previousElementSibling; if(!l.innerHTML.length)l.innerHTML=document.title}</script>

</header><div id="BodyB">


<div id="d1" style="font-size:20px;"></div>







</div><footer id="BodyF"></footer><style id="LastStyleTag"></style><script>const BodyH=dgebi("BodyH") , BodyB=dgebi("BodyB") , BodyF=dgebi("BodyF") , LastStyleTag=dgebi("LastStyleTag") , LastStyleSheet=LastStyleTag.sheet;

let d1=dgebi("d1"); for(let t=0;t<60;t++)dcept(d1,"div");
{
    
let dc=d1.children;

let srcAr=[0,1,2,3,4,5,6,7,8,9,' Ten ',' 11、 ... and ',' Twelve ',' 13、 ... and ',' fourteen ',' 15、 ... and '] , newAr=null , ms , ci=0 , count=600 * 1000;

function showNewAr(){
    dc[ci++].innerHTML="newAr=["+newAr+"]<br/>";}

dc[ci++].innerText=" perform "+count+" Time ";
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=srcAr.concat();} dc[ci++].innerHTML=" use  srcAr.concat()  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=srcAr.slice();} dc[ci++].innerHTML=" use  srcAr.slice()  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=Array.from(srcAr);} dc[ci++].innerHTML=" use  Array.from(srcAr)  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=[...srcAr];} dc[ci++].innerHTML=" use  [...srcAr]  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=Object.assign([],srcAr);} dc[ci++].innerHTML=" use  Object.assign([],srcAr)  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=JSON.parse(JSON.stringify(srcAr));} dc[ci++].innerHTML=" use  JSON.parse(JSON.stringify(srcAr))  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=srcAr.slice();} dc[ci++].innerHTML=" The second time  srcAr.slice()  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=srcAr.concat();} dc[ci++].innerHTML=" The second time  srcAr.concat()  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=new Array(); for(let i=0;i<srcAr.length;i++)newAr.push(srcAr[i]); } dc[ci++].innerHTML=" use  newAr=new Array(); for(let i=0;i<srcAr.length;i++)newAr.push(srcAr[i]);  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=new Array(); for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; } dc[ci++].innerHTML=" use  newAr=new Array(); for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; }  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=[]; for(let i=0;i<srcAr.length;i++)newAr.push(srcAr[i]); } dc[ci++].innerHTML=" use  newAr=[]; for(let i=0;i<srcAr.length;i++)newAr.push(srcAr[i]);  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=[]; for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; } dc[ci++].innerHTML=" use  newAr=[]; for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; }  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=Array(srcAr.length); for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; } dc[ci++].innerHTML=" use  newAr=Array(srcAr.length); for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; }  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=new Array(srcAr.length); for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; } dc[ci++].innerHTML=" use  newAr=new Array(srcAr.length); for(let i=0;i<srcAr.length;i++)newAr[i]=srcAr[i]; }  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=srcAr.concat();} dc[ci++].innerHTML=" Use... For the third time  srcAr.concat()  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
ms=Date.now(); for(let t=0;t<count;t++){
    newAr=srcAr.slice();} dc[ci++].innerHTML=" Use... For the third time  srcAr.slice()  when  "+"<strong class='ms' >"+(Date.now()-ms)+"</strong>"+"  millisecond ";    showNewAr();
}






</script></body></html>
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本文为[kfepiza]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/208/202207272051073570.html

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