Performs stable sorting of an array, preserving the initial indexes of items when their values are the same.
Does not mutate the original array, but returns a new array instead.

Use to pair each element of the input array with its corresponding index.
Use Array.prototype.sort() and a compare function to sort the list, preserving their initial order if the items compared are equal.
Use to convert back to the initial array items.

继续阅读 30秒学会 JavaScript 片段 – stableSort