js randomly sorts an array. How is it performed in sort?
var arr = [1,2,3,4,5,6,7,8,9,10];
arr.sort(function(){
return Math.random() - 0.5;
})
console.log(arr);
js randomly sorts an array. How is it performed in sort?
var arr = [1,2,3,4,5,6,7,8,9,10];
arr.sort(function(){
return Math.random() - 0.5;
})
console.log(arr);Array.prototype.sort only defines the behavior in the es specification, and does not specify the implementation of the specific sorting algorithm, so the implementation of each engine is different.
for V8, insert sort is used if the array length is less than 10, otherwise quick sort
https://github.com/v8/v8/blob.
4V8array.sorttypedarray.sorttorqueV8cPPDSL
sort . Let me answer "js randomly sorts an array".
the method of the subject is wrong, and almost all elements (at least in Chrome) will stay in their original place!
< table id= "results" > < tbody > < tr > < th > Results < / th > < th > slot 0 < / th > < th > slot 1 < / th > < th > slot 2 < / th > < th > slot 3 < / th > < th > slot 4 < / th > < th > slot 5 < / th > < th > slot 6 < / th > < th > slot 7 < / th > < th > slot 8 < / th > < th > slot 9 < / th > < / tr > < tr > < th > ads < / th > < td class= "strongbias" > 2919 < / td > < td > 2889 < / td > < td > 1924 < / td > < td > 1120 < / td > < td > 581 < / td > < td > 296 < / td > < td > 141 < / td > < td > 83 < / td > < td > 34 < / td > < td > 13 < / td > < / tr > < tr > < th > bones < / th > < td > 2925 < / td > < td class= "strongbias" > 2859 < / td > < td > 1901 < / td > < td > 1104 < / td > < td > 604 < / td > < td > 294 < / td > < td > 165 < / td > < td > 77 < / td > < td > 48 < / td > < td > 23 < / td > < / tr > < tr > < th > clips < / th > < td > 1883 < / td > < td > 1951 < / td > < td class= "bias" > 2259 < / td > < td > 1689 < / td > < td > 1030 < / td > < td > 585 < / td > < td > 324 < / td > < td > 165 < / td > < td > 78 < / td > < td > 36 < / td > < / tr > < tr > < th > dudes < / th > < td > 1096 < / td > < td > 1081 < / td > < td > 1742 < / td > < td class= "bias" > 2228 < / td > < td > 1734 < / td > < td > 1005 < / td > < td > 592 < / td > < td > 310 < / td > < td > 144 < / td > < td > 68 < / td > < / tr > < tr > < th > eBay < / th > < td > 550 < / td > < td > 603 < / td > < td > 1059 < / td > < td > 1760 < / td > < td class= "bias" > 2229 < / td > < td > 1785 < / td > < td > 1034 < / td > < td > 564 < / td > < td > 274 < / td > < td > 142 < / td > < / tr > < tr > < th > fences < / th > < td > 306 < / td > < td > 298 < / td > < td > 558 < / td > < td > 993 < / td > < td > 1738 < / td > < td class= "bias" > 2319 < / td > < td > 1817 < / td > < td > 1064 < / td > < td > 608 < / td > < td > 299 < / td > < / tr > < tr > < th > gags < / th > < td > 161 < / td > < td > 172 < / td > < td > 295 < / td > < td > 569 < / td > < td > 1056 < / td > < td > 1718 < / td > < td class= "bias" > 2346 < / td > < td > 1915 < / td > < td > 1131 < / td > < td > 637 < / td > < / tr > < tr > < th > hats < / th > < td > 89 < / td > < td > 80 < / td > < td > 147 < / td > < td > 323 < / td > < td > 575 < / td > < td > 1127 < / td > < td > 1731 < / td > < td class= "bias" > 2595 < / td > < td > 2068 < / td > < td > 1265 < / td > < / tr > < tr > < th > iTunes < / th > < td > 45 < / td > < td > 45 < / td > < td > 82 < / td > < td > 146 < / td > < td > 286 < / td > < td > 564 < / td > < td > 1234 < / td > < td > 2015 < / td > < td class= "strongbias" > 3144 < / td > < td > 2439 < / td > < / tr > < tr > < th > jacks < / th > < td > 26 < / td > < td > 22 < / td > < td > 33 < / td > < td > 68 < / td > < td > 167 < / td > < td > 307 < / td > < td > 616 < / td > < td > 1212 < / td > < td > 2471 < / td > < td class= "strongbias" > 5078 < / td > < / tr > < / tbody > < / table >https://jsfiddle.net/rcmp0aLL/
in fact, whether the subject's method can disrupt the array or not is dependent on the concrete implementation of sort . The specific implementation of Chrome please see the boss upstairs, in any case, the result is not good.
what is the correct posture?
with lodash _ .shuffle , it is simple, fast, direct and easy to maintain.
or, implement a Fisher-Yates algorithm:
https://stackoverflow.com/que.
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