Ramda: Does Ramda sort have sideffects?

[sugoidesune]

I used R.sort in a Vue project inside a computed propert, which does not allow for mutations.
The Eslinter threw an error for R.sort, even though it does not make mutations.

I Forwarded the question to the Vue team, and solved the problem by ignoring linter error with a single line comment.

[Bradcomp]

Hi @sugoidesune! Are you asking whether sort mutates the input Array? It does not. Ramda will never mutate your input.

[CrossEye]

... and in fact, sort is one of Ramda's simplest implementations, essentially doing

(comparator) => (arr) => arr .slice (0) .sort (comparator)

But note that Ramda does not prevent you from creating side-effects. That is, while Ramda will not mutate your data, it make no attempt to prevent you from doing so. For instance,

const xs = [{size: 12}, {size: 7}, {size: 4}, {size: 24}, {size: 10}, {size: 21}, {size: 6}]

const sortedXs = sort ((a, b) => {
  a.type = a.size < 10 ? 'small' : a.size > 20 ? 'large' : 'medium' // side-effect
  b.type = b.size < 10 ? 'small' : b.size > 20 ? 'large' : 'medium' // side-effect
  return a.size - b.size
}) (xs)

sortedXs //=>
//    {size: 4,  type: "small"},
//    {size: 6,  type: "small"}
//    {size: 7,  type: "small"},
//    {size: 10, type: "medium"},
//    {size: 12, type: "medium"},
//    {size: 21, type: "large"},
//    {size: 24, type: "large"},
// ]

// but your original data has also been changed

xs //=>
// [
//    {size: 12, type: "medium"},
//    {size: 7,  type: "small"},
//    {size: 4,  type: "small"},
//    {size: 24, type: "large"},
//    {size: 10, type: "medium"},
//    {size: 21, type: "large"},
//    {size: 6,  type: "small"}
// ]

[sugoidesune]

I am very sorry, during writing of the question, i decided to look into the source code and found my answer. And did not intend to post the question, i suppose it save anyway.
My Issue was, with eslinter that throws a "mutation error", for R.sort.
It was in a Nuxt project using computed properties.

Thank you for still answering! Amazing.