You can use the sort() method to sorts the values as strings in alphabetical and descending order in JavaScript. By default, this method sorts values in ascending order.
Note: This method changes the original array.
Example of Sort Array in descending order JavaScript
HTML Example code Sort numbers in an array in descending order:
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
<script type="text/javascript">
var ab = [40, 30, 10, 50, 20, 60];
ab.sort(function(a, b){return b-a});
alert(ab);
</script>
</script>
</head>
<body>
</body>
</html>
Output:
What are the ways to sort strings in descending order in JavaScript?
Answer: There a many ways to sort string in JavaScript, we are trying only with 3 most common ways:-
obj.sort().reverse();Or
obj.sort((a, b) => (a > b ? -1 : 1))Or
obj.sort((a, b) => b.localeCompare(a) )The performance winner is : obj.sort().reverse().
Testing with an array of 10.000 elements, obj.sort().reverse() is faster than obj.sort( function ) (except on chrome), and obj.sort( function ) (using localCompare).
Performance test here :
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
var results = [[],[],[]]
for(let i = 0; i < 100; i++){
const randomArrayGen = () => Array.from({length: 10000}, () => Math.random().toString(30));
const randomArray = randomArrayGen();
const copyArray = x => x.slice();
obj = copyArray(randomArray);
let t0 = performance.now();
obj.sort().reverse();
let t1 = performance.now();
obj = copyArray(randomArray);
let t2 = performance.now();
obj.sort((a, b) => (a > b ? -1 : 1))
let t3 = performance.now();
obj = copyArray(randomArray);
let t4 = performance.now();
obj.sort((a, b) => b.localeCompare(a))
let t5 = performance.now();
results[0].push(t1 - t0);
results[1].push(t3 - t2);
results[2].push(t5 - t4);
}
const calculateAverage = x => x.reduce((a,b) => a + b) / x.length ;
console.log("obj.sort().reverse(): " + calculateAverage(results[0]));
console.log("obj.sort((a, b) => (a > b ? -1 : 1)): " + calculateAverage(results[1]));
console.log("obj.sort((a, b) => b.localeCompare(a)): " + calculateAverage(results[2]));
</script>
</head>
<body>
</body>
</html>Output:
Source: stackoverflow…
Do comment if you know much better example or have any doubts on this topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version
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