How do you sort an array of words with Ramda?

Question

Sorting numbers is easy with Ramda.

const sizes = ["18", "20", "16", "14"]
console.log("Sorted sizes", R.sort((a, b) => a - b, sizes))
//=> [ '14', '16', '18', '20' ]

Sorting an array of words with vanilla javascript is too.

const trees = ["cedar", "elm", "willow", "beech"]
console.log("Sorted trees", trees.sort())

How would you sort an array of words with Ramda.
If you had to.

const trees = ["cedar", "elm", "willow", "beech"]
console.log("Sorted trees", R.sort((a, b) => a - b, trees))
//=> ["cedar", "elm", "willow", "beech"]

@charlietfl Might be because the native method requires mutation of an existing object, unlike `R.sort` — CertainPerformance, Sep 30 '18 at 19:29
I guess the native sort mutates the current list whereas ramda sort returns a copy. — Anirudh Mangalvedhekar, Sep 30 '18 at 19:29

score 15 · Answer 1 · answered Sep 30 '18 at 19:28

Don't try to subtract strings - instead, use localeCompare to check whether one string comes before another alphabetically:

const trees = ["cedar", "elm", "willow", "beech"]
console.log("Sorted trees", R.sort((a, b) => a.localeCompare(b), trees))

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.js"></script>

Ori Drori · Answer 2 · 2018-10-01T00:50:04.083

11

You can create a comparator with R.comparator and R.lt:

const trees = ["cedar", "elm", "willow", "beech"]
const result = R.sort(R.comparator(R.lt), trees)
console.log("Sorted trees", result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

edited Oct 01 '18 at 00:50

answered Sep 30 '18 at 19:33

Ori Drori

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Fredric Waadeland · Accepted Answer · 2020-10-14T10:13:39.753

9

import R from 'ramda'

const names = ['Khan', 'Thanos', 'Hulk']

const sortNamesAsc = R.sortBy(R.identity) // alphabetically
const sortNamesDesc = R.pipe(sortNamesAsc, R.reverse)

sortNamesAsc(names) // ['Hulk', 'Khan', 'Thanos']
sortNamesDesc(names) // ['Thanos', 'Khan', 'Hulk']

Ramda Repl example

edited Oct 14 '20 at 10:13

answered Oct 14 '20 at 10:00

Fredric Waadeland

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Wonderfully complete answer! – ShaneSauce Oct 04 '22 at 22:37

score 0 · Answer 4 · answered Sep 30 '18 at 19:30

0

Is this what you mean by sort an array of words with Ramda?

import R from 'ramda'
var objs = [ 
    { first_name: 'x', last_name: 'a'     },
    { first_name: 'y',    last_name: 'b'   },
    { first_name: 'z', last_name: 'c' }
];
var ascendingSortedObjs = R.sortBy(R.prop('last_nom'), objs)
var descendingSortedObjs = R.reverse(ascendingSortedObjs)

answered Sep 30 '18 at 19:30

Unfortunately no, this is sorting an array of objects by a key but thanks you for answer. – Sifnos Sep 30 '18 at 19:48

How do you sort an array of words with Ramda?

4 Answers4