CODEWITHSUNDEEP
javascriptsorting
Ole
Ole

Reputation: 46960

Sorting strings in descending order in Javascript (Most efficiently)?

W3CSchools has this example:

var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.sort();
fruits.reverse();

Is this the most efficient way to sort strings in descending order in Javascript?

Update

One of the answers is using localeCompare. Just curious whether if we do reverse(), will that work for all locales (Maybe this is a separate question - Just let me know in the comments)?

Upvotes: 134

Views: 243787

Answers (5)

Nick Ribal
Nick Ribal

Reputation: 2109

The easiest way to revers the order of sorting is by swapping the operands. In ES2015 that's as easy as [b, a] = [a, b]. A full example:

function compareWithOrder(a, b, shouldReverse = false) {
  if (shouldReverse) {
    [b, a] = [a, b]
  }
  return yourComparatorFn(a, b)
}

Upvotes: 4

Raudel Garcia
Raudel Garcia

Reputation: 1

I know this is an old question, but an interesting one. This is my solution for a non-special character's input.

var arr = ["a","b","c","A","B","Z"];

  console.log(arr.sort((a,b)=> {
      const lastCodeIn = b.toLowerCase().charCodeAt();
      const lastCode = b.charCodeAt();
      const firstCodeIn = a.toLowerCase().charCodeAt();
      const firstCode = a.charCodeAt();

      if(lastCodeIn - firstCodeIn === 0){
        return lastCode - firstCode;
      }
      return lastCodeIn - firstCodeIn;
    })
  );//[ 'Z', 'c', 'b', 'B', 'a', 'A' ]

The reason is that ascii code for UPPER case are lower than lower case.

Upvotes: 0

colxi
colxi

Reputation: 8670

If you consider

obj.sort().reverse();

VS

obj.sort((a, b) => (a > b ? -1 : 1))

VS

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 : 

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]));

Upvotes: 235

Mungai_Keren
Mungai_Keren

Reputation: 21

var arr = ["a","b","c","A","B","Z"];

arr.sort((a,b)=>b.localeCompare(a))

console.log(arr)

Upvotes: 0

Emeeus
Emeeus

Reputation: 5250

Using just sort and reverse a > Z , that is wrong if you want to order lower cases and upper cases strings:

var arr = ["a","b","c","A","B","Z"];

arr.sort().reverse();

console.log(arr)//<-- [ 'c', 'b', 'a', 'Z', 'B', 'A' ] wrong!!!

English characters

var arr = ["a","b","c","A","B","Z"];

arr.sort((a,b)=>b.localeCompare(a))

console.log(arr)

Special characters using locales, in this example es (spanish)

var arr = ["a", "á", "b","c","A","Á","B","Z"];

arr.sort((a, b) => b.localeCompare(a, 'es', {sensitivity: 'base'}))


console.log(arr)

sensitivity in this case is base:

Only strings that differ in base letters compare as unequal. Examples: a ≠ b, a = á, a = A.

Upvotes: 9

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