Analysis of Javascript array sort and reverse

The sort () method is used to sort the elements of an array.
Reverse () to reverse the elements in an array

First, let's try the following code:

The code is as follows	Copy Code
var values = [1, 0, 5, 15, 10]; Values.reverse (); Console.log (values);

What would the output be:

[10, 15, 5, 0, 1]

Reverse () is simply to turn the array upside down, so the next thing you want to spit out is sort ()

The code is as follows	Copy Code
var values = [1, 0, 5, 15, 10]; Values.sort (); Console.log (values);

The output of this function turns out to be:

[0, 1, 10, 15, 5]

What's going on?

In fact, the sort () function uses the ToString () transformation, and string comparisons are ASCII, so it's better if we need to sort, or write ourselves a sort ().

The code is as follows	Copy Code
var values = [1, 0, 5, 15, 10]; function Compare (value1, value2) { if (value1 < value2) { return-1; else if (value1 > value2) { return 1; } else { return 0; } } Values.sort (Compare); Console.log (values);

If you change it-1 and 1, you can sort it backwards.
Now the output results:

[0, 1, 5, 10, 15]

A simpler formulation is to use return value2-value1 within compare ();